Update compiler-rt to trunk r228651. This enables using Address

Sanitizer and Undefined Behavior Sanitizer with clang 3.6.0.

145 files changed, 4920 insertions, 3316 deletions

diff --git a/contrib/compiler-rt/include/sanitizer/asan_interface.h b/contrib/compiler-rt/include/sanitizer/asan_interface.h
index 435391486aaa..7763389ab257 100644
--- a/contrib/compiler-rt/include/sanitizer/asan_interface.h
+++ b/contrib/compiler-rt/include/sanitizer/asan_interface.h
@@ -114,8 +114,7 @@ extern "C" {
   // Returns the old value.
   int __asan_set_error_exit_code(int exit_code);
 
-  // Sets the callback to be called right before death on error.
-  // Passing 0 will unset the callback.
+  // Deprecated. Call __sanitizer_set_death_callback instead.
   void __asan_set_death_callback(void (*callback)(void));
 
   void __asan_set_error_report_callback(void (*callback)(const char*));
diff --git a/contrib/compiler-rt/include/sanitizer/common_interface_defs.h b/contrib/compiler-rt/include/sanitizer/common_interface_defs.h
index 9cb5ad88de6a..ef645e527119 100644
--- a/contrib/compiler-rt/include/sanitizer/common_interface_defs.h
+++ b/contrib/compiler-rt/include/sanitizer/common_interface_defs.h
@@ -62,18 +62,6 @@ extern "C" {
   void __sanitizer_unaligned_store32(void *p, uint32_t x);
   void __sanitizer_unaligned_store64(void *p, uint64_t x);
 
-  // Initialize coverage.
-  void __sanitizer_cov_init();
-  // Record and dump coverage info.
-  void __sanitizer_cov_dump();
-  // Open <name>.sancov.packed in the coverage directory and return the file
-  // descriptor. Returns -1 on failure, or if coverage dumping is disabled.
-  // This is intended for use by sandboxing code.
-  intptr_t __sanitizer_maybe_open_cov_file(const char *name);
-  // Get the number of total unique covered entities (blocks, edges, calls).
-  // This can be useful for coverage-directed in-process fuzzers.
-  uintptr_t __sanitizer_get_total_unique_coverage();
-
   // Annotate the current state of a contiguous container, such as
   // std::vector, std::string or similar.
   // A contiguous container is a container that keeps all of its elements
@@ -120,6 +108,9 @@ extern "C" {
   // Print the stack trace leading to this call. Useful for debugging user code.
   void __sanitizer_print_stack_trace();
 
+  // Sets the callback to be called right before death on error.
+  // Passing 0 will unset the callback.
+  void __sanitizer_set_death_callback(void (*callback)(void));
 #ifdef __cplusplus
 }  // extern "C"
 #endif
diff --git a/contrib/compiler-rt/include/sanitizer/coverage_interface.h b/contrib/compiler-rt/include/sanitizer/coverage_interface.h
new file mode 100644
index 000000000000..88a7e480081d
--- /dev/null
+++ b/contrib/compiler-rt/include/sanitizer/coverage_interface.h
@@ -0,0 +1,46 @@
+//===-- sanitizer/coverage_interface.h --------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Public interface for sanitizer coverage.
+//===----------------------------------------------------------------------===//
+
+#ifndef SANITIZER_COVERAG_INTERFACE_H
+#define SANITIZER_COVERAG_INTERFACE_H
+
+#include <sanitizer/common_interface_defs.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+  // Initialize coverage.
+  void __sanitizer_cov_init();
+  // Record and dump coverage info.
+  void __sanitizer_cov_dump();
+  // Open <name>.sancov.packed in the coverage directory and return the file
+  // descriptor. Returns -1 on failure, or if coverage dumping is disabled.
+  // This is intended for use by sandboxing code.
+  intptr_t __sanitizer_maybe_open_cov_file(const char *name);
+  // Get the number of total unique covered entities (blocks, edges, calls).
+  // This can be useful for coverage-directed in-process fuzzers.
+  uintptr_t __sanitizer_get_total_unique_coverage();
+
+  // Reset the basic-block (edge) coverage to the initial state.
+  // Useful for in-process fuzzing to start collecting coverage from scratch.
+  // Experimental, will likely not work for multi-threaded process.
+  void __sanitizer_reset_coverage();
+  // Set *data to the array of covered PCs and return the size of that array.
+  // Some of the entries in *data will be zero.
+  uintptr_t __sanitizer_get_coverage_guards(uintptr_t **data);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // SANITIZER_COVERAG_INTERFACE_H
diff --git a/contrib/compiler-rt/include/sanitizer/msan_interface.h b/contrib/compiler-rt/include/sanitizer/msan_interface.h
index 5be586047ced..c3a19bf345ac 100644
--- a/contrib/compiler-rt/include/sanitizer/msan_interface.h
+++ b/contrib/compiler-rt/include/sanitizer/msan_interface.h
@@ -38,7 +38,9 @@ extern "C" {
      contents). */
   void __msan_unpoison_string(const volatile char *a);
 
-  /* Make memory region fully uninitialized (without changing its contents). */
+  /* Make memory region fully uninitialized (without changing its contents).
+     This is a legacy interface that does not update origin information. Use
+     __msan_allocated_memory() instead. */
   void __msan_poison(const volatile void *a, size_t size);
 
   /* Make memory region partially uninitialized (without changing its contents).
diff --git a/contrib/compiler-rt/lib/asan/asan_activation.cc b/contrib/compiler-rt/lib/asan/asan_activation.cc
index eb4a6db0b85e..3bc01984898d 100644
--- a/contrib/compiler-rt/lib/asan/asan_activation.cc
+++ b/contrib/compiler-rt/lib/asan/asan_activation.cc
@@ -16,40 +16,106 @@
 #include "asan_allocator.h"
 #include "asan_flags.h"
 #include "asan_internal.h"
+#include "asan_poisoning.h"
+#include "asan_stack.h"
 #include "sanitizer_common/sanitizer_flags.h"
 
 namespace __asan {
 
 static struct AsanDeactivatedFlags {
-  int quarantine_size;
-  int max_redzone;
+  AllocatorOptions allocator_options;
   int malloc_context_size;
   bool poison_heap;
-  bool alloc_dealloc_mismatch;
-  bool allocator_may_return_null;
+  bool coverage;
+  const char *coverage_dir;
+
+  void RegisterActivationFlags(FlagParser *parser, Flags *f, CommonFlags *cf) {
+#define ASAN_ACTIVATION_FLAG(Type, Name) \
+  RegisterFlag(parser, #Name, "", &f->Name);
+#define COMMON_ACTIVATION_FLAG(Type, Name) \
+  RegisterFlag(parser, #Name, "", &cf->Name);
+#include "asan_activation_flags.inc"
+#undef ASAN_ACTIVATION_FLAG
+#undef COMMON_ACTIVATION_FLAG
+
+    RegisterIncludeFlag(parser, cf);
+  }
+
+  void OverrideFromActivationFlags() {
+    Flags f;
+    CommonFlags cf;
+    FlagParser parser;
+    RegisterActivationFlags(&parser, &f, &cf);
+
+    // Copy the current activation flags.
+    allocator_options.CopyTo(&f, &cf);
+    cf.malloc_context_size = malloc_context_size;
+    f.poison_heap = poison_heap;
+    cf.coverage = coverage;
+    cf.coverage_dir = coverage_dir;
+    cf.verbosity = Verbosity();
+    cf.help = false; // this is activation-specific help
+
+    // Check if activation flags need to be overriden.
+    if (const char *env = GetEnv("ASAN_ACTIVATION_OPTIONS")) {
+      parser.ParseString(env);
+    }
+
+    // Override from getprop asan.options.
+    char buf[100];
+    GetExtraActivationFlags(buf, sizeof(buf));
+    parser.ParseString(buf);
+
+    SetVerbosity(cf.verbosity);
+
+    if (Verbosity()) ReportUnrecognizedFlags();
+
+    if (cf.help) parser.PrintFlagDescriptions();
+
+    allocator_options.SetFrom(&f, &cf);
+    malloc_context_size = cf.malloc_context_size;
+    poison_heap = f.poison_heap;
+    coverage = cf.coverage;
+    coverage_dir = cf.coverage_dir;
+  }
+
+  void Print() {
+    Report(
+        "quarantine_size_mb %d, max_redzone %d, poison_heap %d, "
+        "malloc_context_size %d, alloc_dealloc_mismatch %d, "
+        "allocator_may_return_null %d, coverage %d, coverage_dir %s\n",
+        allocator_options.quarantine_size_mb, allocator_options.max_redzone,
+        poison_heap, malloc_context_size,
+        allocator_options.alloc_dealloc_mismatch,
+        allocator_options.may_return_null, coverage, coverage_dir);
+  }
 } asan_deactivated_flags;
 
 static bool asan_is_deactivated;
 
-void AsanStartDeactivated() {
+void AsanDeactivate() {
+  CHECK(!asan_is_deactivated);
   VReport(1, "Deactivating ASan\n");
-  // Save flag values.
-  asan_deactivated_flags.quarantine_size = flags()->quarantine_size;
-  asan_deactivated_flags.max_redzone = flags()->max_redzone;
-  asan_deactivated_flags.poison_heap = flags()->poison_heap;
-  asan_deactivated_flags.malloc_context_size =
-      common_flags()->malloc_context_size;
-  asan_deactivated_flags.alloc_dealloc_mismatch =
-      flags()->alloc_dealloc_mismatch;
-  asan_deactivated_flags.allocator_may_return_null =
-      common_flags()->allocator_may_return_null;
-
-  flags()->quarantine_size = 0;
-  flags()->max_redzone = 16;
-  flags()->poison_heap = false;
-  common_flags()->malloc_context_size = 0;
-  flags()->alloc_dealloc_mismatch = false;
-  common_flags()->allocator_may_return_null = true;
+
+  // Stash runtime state.
+  GetAllocatorOptions(&asan_deactivated_flags.allocator_options);
+  asan_deactivated_flags.malloc_context_size = GetMallocContextSize();
+  asan_deactivated_flags.poison_heap = CanPoisonMemory();
+  asan_deactivated_flags.coverage = common_flags()->coverage;
+  asan_deactivated_flags.coverage_dir = common_flags()->coverage_dir;
+
+  // Deactivate the runtime.
+  SetCanPoisonMemory(false);
+  SetMallocContextSize(1);
+  ReInitializeCoverage(false, nullptr);
+
+  AllocatorOptions disabled = asan_deactivated_flags.allocator_options;
+  disabled.quarantine_size_mb = 0;
+  disabled.min_redzone = 16;  // Redzone must be at least 16 bytes long.
+  disabled.max_redzone = 16;
+  disabled.alloc_dealloc_mismatch = false;
+  disabled.may_return_null = true;
+  ReInitializeAllocator(disabled);
 
   asan_is_deactivated = true;
 }
@@ -58,31 +124,19 @@ void AsanActivate() {
   if (!asan_is_deactivated) return;
   VReport(1, "Activating ASan\n");
 
-  // Restore flag values.
-  // FIXME: this is not atomic, and there may be other threads alive.
-  flags()->quarantine_size = asan_deactivated_flags.quarantine_size;
-  flags()->max_redzone = asan_deactivated_flags.max_redzone;
-  flags()->poison_heap = asan_deactivated_flags.poison_heap;
-  common_flags()->malloc_context_size =
-      asan_deactivated_flags.malloc_context_size;
-  flags()->alloc_dealloc_mismatch =
-      asan_deactivated_flags.alloc_dealloc_mismatch;
-  common_flags()->allocator_may_return_null =
-      asan_deactivated_flags.allocator_may_return_null;
-
-  ParseExtraActivationFlags();
+  asan_deactivated_flags.OverrideFromActivationFlags();
 
-  ReInitializeAllocator();
+  SetCanPoisonMemory(asan_deactivated_flags.poison_heap);
+  SetMallocContextSize(asan_deactivated_flags.malloc_context_size);
+  ReInitializeCoverage(asan_deactivated_flags.coverage,
+                       asan_deactivated_flags.coverage_dir);
+  ReInitializeAllocator(asan_deactivated_flags.allocator_options);
 
   asan_is_deactivated = false;
-  VReport(
-      1,
-      "quarantine_size %d, max_redzone %d, poison_heap %d, "
-      "malloc_context_size %d, alloc_dealloc_mismatch %d, "
-      "allocator_may_return_null %d\n",
-      flags()->quarantine_size, flags()->max_redzone, flags()->poison_heap,
-      common_flags()->malloc_context_size, flags()->alloc_dealloc_mismatch,
-      common_flags()->allocator_may_return_null);
+  if (Verbosity()) {
+    Report("Activated with flags:\n");
+    asan_deactivated_flags.Print();
+  }
 }
 
 }  // namespace __asan
diff --git a/contrib/compiler-rt/lib/asan/asan_activation.h b/contrib/compiler-rt/lib/asan/asan_activation.h
index dafb840a6042..d5e1ce433001 100644
--- a/contrib/compiler-rt/lib/asan/asan_activation.h
+++ b/contrib/compiler-rt/lib/asan/asan_activation.h
@@ -16,7 +16,7 @@
 #define ASAN_ACTIVATION_H
 
 namespace __asan {
-void AsanStartDeactivated();
+void AsanDeactivate();
 void AsanActivate();
 }  // namespace __asan
 
diff --git a/contrib/compiler-rt/lib/asan/asan_activation_flags.inc b/contrib/compiler-rt/lib/asan/asan_activation_flags.inc
new file mode 100644
index 000000000000..d4c089ec6538
--- /dev/null
+++ b/contrib/compiler-rt/lib/asan/asan_activation_flags.inc
@@ -0,0 +1,35 @@
+//===-- asan_activation_flags.inc -------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// A subset of ASan (and common) runtime flags supported at activation time.
+//
+//===----------------------------------------------------------------------===//
+#ifndef ASAN_ACTIVATION_FLAG
+# error "Define ASAN_ACTIVATION_FLAG prior to including this file!"
+#endif
+
+#ifndef COMMON_ACTIVATION_FLAG
+# error "Define COMMON_ACTIVATION_FLAG prior to including this file!"
+#endif
+
+// ASAN_ACTIVATION_FLAG(Type, Name)
+// See COMMON_FLAG in sanitizer_flags.inc for more details.
+
+ASAN_ACTIVATION_FLAG(int, redzone)
+ASAN_ACTIVATION_FLAG(int, max_redzone)
+ASAN_ACTIVATION_FLAG(int, quarantine_size_mb)
+ASAN_ACTIVATION_FLAG(bool, alloc_dealloc_mismatch)
+ASAN_ACTIVATION_FLAG(bool, poison_heap)
+
+COMMON_ACTIVATION_FLAG(bool, allocator_may_return_null)
+COMMON_ACTIVATION_FLAG(int, malloc_context_size)
+COMMON_ACTIVATION_FLAG(bool, coverage)
+COMMON_ACTIVATION_FLAG(const char *, coverage_dir)
+COMMON_ACTIVATION_FLAG(int, verbosity)
+COMMON_ACTIVATION_FLAG(bool, help)
diff --git a/contrib/compiler-rt/lib/asan/asan_allocator.cc b/contrib/compiler-rt/lib/asan/asan_allocator.cc
new file mode 100644
index 000000000000..fd63ac68c09e
--- /dev/null
+++ b/contrib/compiler-rt/lib/asan/asan_allocator.cc
@@ -0,0 +1,909 @@
+//===-- asan_allocator.cc -------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// Implementation of ASan's memory allocator, 2-nd version.
+// This variant uses the allocator from sanitizer_common, i.e. the one shared
+// with ThreadSanitizer and MemorySanitizer.
+//
+//===----------------------------------------------------------------------===//
+#include "asan_allocator.h"
+
+#include "asan_mapping.h"
+#include "asan_poisoning.h"
+#include "asan_report.h"
+#include "asan_stack.h"
+#include "asan_thread.h"
+#include "sanitizer_common/sanitizer_allocator_interface.h"
+#include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_internal_defs.h"
+#include "sanitizer_common/sanitizer_list.h"
+#include "sanitizer_common/sanitizer_stackdepot.h"
+#include "sanitizer_common/sanitizer_quarantine.h"
+#include "lsan/lsan_common.h"
+
+namespace __asan {
+
+// Valid redzone sizes are 16, 32, 64, ... 2048, so we encode them in 3 bits.
+// We use adaptive redzones: for larger allocation larger redzones are used.
+static u32 RZLog2Size(u32 rz_log) {
+  CHECK_LT(rz_log, 8);
+  return 16 << rz_log;
+}
+
+static u32 RZSize2Log(u32 rz_size) {
+  CHECK_GE(rz_size, 16);
+  CHECK_LE(rz_size, 2048);
+  CHECK(IsPowerOfTwo(rz_size));
+  u32 res = Log2(rz_size) - 4;
+  CHECK_EQ(rz_size, RZLog2Size(res));
+  return res;
+}
+
+static AsanAllocator &get_allocator();
+
+// The memory chunk allocated from the underlying allocator looks like this:
+// L L L L L L H H U U U U U U R R
+//   L -- left redzone words (0 or more bytes)
+//   H -- ChunkHeader (16 bytes), which is also a part of the left redzone.
+//   U -- user memory.
+//   R -- right redzone (0 or more bytes)
+// ChunkBase consists of ChunkHeader and other bytes that overlap with user
+// memory.
+
+// If the left redzone is greater than the ChunkHeader size we store a magic
+// value in the first uptr word of the memory block and store the address of
+// ChunkBase in the next uptr.
+// M B L L L L L L L L L  H H U U U U U U
+//   |                    ^
+//   ---------------------|
+//   M -- magic value kAllocBegMagic
+//   B -- address of ChunkHeader pointing to the first 'H'
+static const uptr kAllocBegMagic = 0xCC6E96B9;
+
+struct ChunkHeader {
+  // 1-st 8 bytes.
+  u32 chunk_state       : 8;  // Must be first.
+  u32 alloc_tid         : 24;
+
+  u32 free_tid          : 24;
+  u32 from_memalign     : 1;
+  u32 alloc_type        : 2;
+  u32 rz_log            : 3;
+  u32 lsan_tag          : 2;
+  // 2-nd 8 bytes
+  // This field is used for small sizes. For large sizes it is equal to
+  // SizeClassMap::kMaxSize and the actual size is stored in the
+  // SecondaryAllocator's metadata.
+  u32 user_requested_size;
+  u32 alloc_context_id;
+};
+
+struct ChunkBase : ChunkHeader {
+  // Header2, intersects with user memory.
+  u32 free_context_id;
+};
+
+static const uptr kChunkHeaderSize = sizeof(ChunkHeader);
+static const uptr kChunkHeader2Size = sizeof(ChunkBase) - kChunkHeaderSize;
+COMPILER_CHECK(kChunkHeaderSize == 16);
+COMPILER_CHECK(kChunkHeader2Size <= 16);
+
+// Every chunk of memory allocated by this allocator can be in one of 3 states:
+// CHUNK_AVAILABLE: the chunk is in the free list and ready to be allocated.
+// CHUNK_ALLOCATED: the chunk is allocated and not yet freed.
+// CHUNK_QUARANTINE: the chunk was freed and put into quarantine zone.
+enum {
+  CHUNK_AVAILABLE  = 0,  // 0 is the default value even if we didn't set it.
+  CHUNK_ALLOCATED  = 2,
+  CHUNK_QUARANTINE = 3
+};
+
+struct AsanChunk: ChunkBase {
+  uptr Beg() { return reinterpret_cast<uptr>(this) + kChunkHeaderSize; }
+  uptr UsedSize(bool locked_version = false) {
+    if (user_requested_size != SizeClassMap::kMaxSize)
+      return user_requested_size;
+    return *reinterpret_cast<uptr *>(
+               get_allocator().GetMetaData(AllocBeg(locked_version)));
+  }
+  void *AllocBeg(bool locked_version = false) {
+    if (from_memalign) {
+      if (locked_version)
+        return get_allocator().GetBlockBeginFastLocked(
+            reinterpret_cast<void *>(this));
+      return get_allocator().GetBlockBegin(reinterpret_cast<void *>(this));
+    }
+    return reinterpret_cast<void*>(Beg() - RZLog2Size(rz_log));
+  }
+  bool AddrIsInside(uptr addr, bool locked_version = false) {
+    return (addr >= Beg()) && (addr < Beg() + UsedSize(locked_version));
+  }
+};
+
+struct QuarantineCallback {
+  explicit QuarantineCallback(AllocatorCache *cache)
+      : cache_(cache) {
+  }
+
+  void Recycle(AsanChunk *m) {
+    CHECK_EQ(m->chunk_state, CHUNK_QUARANTINE);
+    atomic_store((atomic_uint8_t*)m, CHUNK_AVAILABLE, memory_order_relaxed);
+    CHECK_NE(m->alloc_tid, kInvalidTid);
+    CHECK_NE(m->free_tid, kInvalidTid);
+    PoisonShadow(m->Beg(),
+                 RoundUpTo(m->UsedSize(), SHADOW_GRANULARITY),
+                 kAsanHeapLeftRedzoneMagic);
+    void *p = reinterpret_cast<void *>(m->AllocBeg());
+    if (p != m) {
+      uptr *alloc_magic = reinterpret_cast<uptr *>(p);
+      CHECK_EQ(alloc_magic[0], kAllocBegMagic);
+      // Clear the magic value, as allocator internals may overwrite the
+      // contents of deallocated chunk, confusing GetAsanChunk lookup.
+      alloc_magic[0] = 0;
+      CHECK_EQ(alloc_magic[1], reinterpret_cast<uptr>(m));
+    }
+
+    // Statistics.
+    AsanStats &thread_stats = GetCurrentThreadStats();
+    thread_stats.real_frees++;
+    thread_stats.really_freed += m->UsedSize();
+
+    get_allocator().Deallocate(cache_, p);
+  }
+
+  void *Allocate(uptr size) {
+    return get_allocator().Allocate(cache_, size, 1, false);
+  }
+
+  void Deallocate(void *p) {
+    get_allocator().Deallocate(cache_, p);
+  }
+
+  AllocatorCache *cache_;
+};
+
+typedef Quarantine<QuarantineCallback, AsanChunk> AsanQuarantine;
+typedef AsanQuarantine::Cache QuarantineCache;
+
+void AsanMapUnmapCallback::OnMap(uptr p, uptr size) const {
+  PoisonShadow(p, size, kAsanHeapLeftRedzoneMagic);
+  // Statistics.
+  AsanStats &thread_stats = GetCurrentThreadStats();
+  thread_stats.mmaps++;
+  thread_stats.mmaped += size;
+}
+void AsanMapUnmapCallback::OnUnmap(uptr p, uptr size) const {
+  PoisonShadow(p, size, 0);
+  // We are about to unmap a chunk of user memory.
+  // Mark the corresponding shadow memory as not needed.
+  FlushUnneededASanShadowMemory(p, size);
+  // Statistics.
+  AsanStats &thread_stats = GetCurrentThreadStats();
+  thread_stats.munmaps++;
+  thread_stats.munmaped += size;
+}
+
+// We can not use THREADLOCAL because it is not supported on some of the
+// platforms we care about (OSX 10.6, Android).
+// static THREADLOCAL AllocatorCache cache;
+AllocatorCache *GetAllocatorCache(AsanThreadLocalMallocStorage *ms) {
+  CHECK(ms);
+  return &ms->allocator_cache;
+}
+
+QuarantineCache *GetQuarantineCache(AsanThreadLocalMallocStorage *ms) {
+  CHECK(ms);
+  CHECK_LE(sizeof(QuarantineCache), sizeof(ms->quarantine_cache));
+  return reinterpret_cast<QuarantineCache *>(ms->quarantine_cache);
+}
+
+void AllocatorOptions::SetFrom(const Flags *f, const CommonFlags *cf) {
+  quarantine_size_mb = f->quarantine_size_mb;
+  min_redzone = f->redzone;
+  max_redzone = f->max_redzone;
+  may_return_null = cf->allocator_may_return_null;
+  alloc_dealloc_mismatch = f->alloc_dealloc_mismatch;
+}
+
+void AllocatorOptions::CopyTo(Flags *f, CommonFlags *cf) {
+  f->quarantine_size_mb = quarantine_size_mb;
+  f->redzone = min_redzone;
+  f->max_redzone = max_redzone;
+  cf->allocator_may_return_null = may_return_null;
+  f->alloc_dealloc_mismatch = alloc_dealloc_mismatch;
+}
+
+struct Allocator {
+  static const uptr kMaxAllowedMallocSize =
+      FIRST_32_SECOND_64(3UL << 30, 64UL << 30);
+  static const uptr kMaxThreadLocalQuarantine =
+      FIRST_32_SECOND_64(1 << 18, 1 << 20);
+
+  AsanAllocator allocator;
+  AsanQuarantine quarantine;
+  StaticSpinMutex fallback_mutex;
+  AllocatorCache fallback_allocator_cache;
+  QuarantineCache fallback_quarantine_cache;
+
+  // ------------------- Options --------------------------
+  atomic_uint16_t min_redzone;
+  atomic_uint16_t max_redzone;
+  atomic_uint8_t alloc_dealloc_mismatch;
+
+  // ------------------- Initialization ------------------------
+  explicit Allocator(LinkerInitialized)
+      : quarantine(LINKER_INITIALIZED),
+        fallback_quarantine_cache(LINKER_INITIALIZED) {}
+
+  void CheckOptions(const AllocatorOptions &options) const {
+    CHECK_GE(options.min_redzone, 16);
+    CHECK_GE(options.max_redzone, options.min_redzone);
+    CHECK_LE(options.max_redzone, 2048);
+    CHECK(IsPowerOfTwo(options.min_redzone));
+    CHECK(IsPowerOfTwo(options.max_redzone));
+  }
+
+  void SharedInitCode(const AllocatorOptions &options) {
+    CheckOptions(options);
+    quarantine.Init((uptr)options.quarantine_size_mb << 20,
+                    kMaxThreadLocalQuarantine);
+    atomic_store(&alloc_dealloc_mismatch, options.alloc_dealloc_mismatch,
+                 memory_order_release);
+    atomic_store(&min_redzone, options.min_redzone, memory_order_release);
+    atomic_store(&max_redzone, options.max_redzone, memory_order_release);
+  }
+
+  void Initialize(const AllocatorOptions &options) {
+    allocator.Init(options.may_return_null);
+    SharedInitCode(options);
+  }
+
+  void ReInitialize(const AllocatorOptions &options) {
+    allocator.SetMayReturnNull(options.may_return_null);
+    SharedInitCode(options);
+  }
+
+  void GetOptions(AllocatorOptions *options) const {
+    options->quarantine_size_mb = quarantine.GetSize() >> 20;
+    options->min_redzone = atomic_load(&min_redzone, memory_order_acquire);
+    options->max_redzone = atomic_load(&max_redzone, memory_order_acquire);
+    options->may_return_null = allocator.MayReturnNull();
+    options->alloc_dealloc_mismatch =
+        atomic_load(&alloc_dealloc_mismatch, memory_order_acquire);
+  }
+
+  // -------------------- Helper methods. -------------------------
+  uptr ComputeRZLog(uptr user_requested_size) {
+    u32 rz_log =
+      user_requested_size <= 64        - 16   ? 0 :
+      user_requested_size <= 128       - 32   ? 1 :
+      user_requested_size <= 512       - 64   ? 2 :
+      user_requested_size <= 4096      - 128  ? 3 :
+      user_requested_size <= (1 << 14) - 256  ? 4 :
+      user_requested_size <= (1 << 15) - 512  ? 5 :
+      user_requested_size <= (1 << 16) - 1024 ? 6 : 7;
+    u32 min_rz = atomic_load(&min_redzone, memory_order_acquire);
+    u32 max_rz = atomic_load(&max_redzone, memory_order_acquire);
+    return Min(Max(rz_log, RZSize2Log(min_rz)), RZSize2Log(max_rz));
+  }
+
+  // We have an address between two chunks, and we want to report just one.
+  AsanChunk *ChooseChunk(uptr addr, AsanChunk *left_chunk,
+                         AsanChunk *right_chunk) {
+    // Prefer an allocated chunk over freed chunk and freed chunk
+    // over available chunk.
+    if (left_chunk->chunk_state != right_chunk->chunk_state) {
+      if (left_chunk->chunk_state == CHUNK_ALLOCATED)
+        return left_chunk;
+      if (right_chunk->chunk_state == CHUNK_ALLOCATED)
+        return right_chunk;
+      if (left_chunk->chunk_state == CHUNK_QUARANTINE)
+        return left_chunk;
+      if (right_chunk->chunk_state == CHUNK_QUARANTINE)
+        return right_chunk;
+    }
+    // Same chunk_state: choose based on offset.
+    sptr l_offset = 0, r_offset = 0;
+    CHECK(AsanChunkView(left_chunk).AddrIsAtRight(addr, 1, &l_offset));
+    CHECK(AsanChunkView(right_chunk).AddrIsAtLeft(addr, 1, &r_offset));
+    if (l_offset < r_offset)
+      return left_chunk;
+    return right_chunk;
+  }
+
+  // -------------------- Allocation/Deallocation routines ---------------
+  void *Allocate(uptr size, uptr alignment, BufferedStackTrace *stack,
+                 AllocType alloc_type, bool can_fill) {
+    if (UNLIKELY(!asan_inited))
+      AsanInitFromRtl();
+    Flags &fl = *flags();
+    CHECK(stack);
+    const uptr min_alignment = SHADOW_GRANULARITY;
+    if (alignment < min_alignment)
+      alignment = min_alignment;
+    if (size == 0) {
+      // We'd be happy to avoid allocating memory for zero-size requests, but
+      // some programs/tests depend on this behavior and assume that malloc
+      // would not return NULL even for zero-size allocations. Moreover, it
+      // looks like operator new should never return NULL, and results of
+      // consecutive "new" calls must be different even if the allocated size
+      // is zero.
+      size = 1;
+    }
+    CHECK(IsPowerOfTwo(alignment));
+    uptr rz_log = ComputeRZLog(size);
+    uptr rz_size = RZLog2Size(rz_log);
+    uptr rounded_size = RoundUpTo(Max(size, kChunkHeader2Size), alignment);
+    uptr needed_size = rounded_size + rz_size;
+    if (alignment > min_alignment)
+      needed_size += alignment;
+    bool using_primary_allocator = true;
+    // If we are allocating from the secondary allocator, there will be no
+    // automatic right redzone, so add the right redzone manually.
+    if (!PrimaryAllocator::CanAllocate(needed_size, alignment)) {
+      needed_size += rz_size;
+      using_primary_allocator = false;
+    }
+    CHECK(IsAligned(needed_size, min_alignment));
+    if (size > kMaxAllowedMallocSize || needed_size > kMaxAllowedMallocSize) {
+      Report("WARNING: AddressSanitizer failed to allocate %p bytes\n",
+             (void*)size);
+      return allocator.ReturnNullOrDie();
+    }
+
+    AsanThread *t = GetCurrentThread();
+    void *allocated;
+    bool check_rss_limit = true;
+    if (t) {
+      AllocatorCache *cache = GetAllocatorCache(&t->malloc_storage());
+      allocated =
+          allocator.Allocate(cache, needed_size, 8, false, check_rss_limit);
+    } else {
+      SpinMutexLock l(&fallback_mutex);
+      AllocatorCache *cache = &fallback_allocator_cache;
+      allocated =
+          allocator.Allocate(cache, needed_size, 8, false, check_rss_limit);
+    }
+
+    if (!allocated)
+      return allocator.ReturnNullOrDie();
+
+    if (*(u8 *)MEM_TO_SHADOW((uptr)allocated) == 0 && CanPoisonMemory()) {
+      // Heap poisoning is enabled, but the allocator provides an unpoisoned
+      // chunk. This is possible if CanPoisonMemory() was false for some
+      // time, for example, due to flags()->start_disabled.
+      // Anyway, poison the block before using it for anything else.
+      uptr allocated_size = allocator.GetActuallyAllocatedSize(allocated);
+      PoisonShadow((uptr)allocated, allocated_size, kAsanHeapLeftRedzoneMagic);
+    }
+
+    uptr alloc_beg = reinterpret_cast<uptr>(allocated);
+    uptr alloc_end = alloc_beg + needed_size;
+    uptr beg_plus_redzone = alloc_beg + rz_size;
+    uptr user_beg = beg_plus_redzone;
+    if (!IsAligned(user_beg, alignment))
+      user_beg = RoundUpTo(user_beg, alignment);
+    uptr user_end = user_beg + size;
+    CHECK_LE(user_end, alloc_end);
+    uptr chunk_beg = user_beg - kChunkHeaderSize;
+    AsanChunk *m = reinterpret_cast<AsanChunk *>(chunk_beg);
+    m->alloc_type = alloc_type;
+    m->rz_log = rz_log;
+    u32 alloc_tid = t ? t->tid() : 0;
+    m->alloc_tid = alloc_tid;
+    CHECK_EQ(alloc_tid, m->alloc_tid);  // Does alloc_tid fit into the bitfield?
+    m->free_tid = kInvalidTid;
+    m->from_memalign = user_beg != beg_plus_redzone;
+    if (alloc_beg != chunk_beg) {
+      CHECK_LE(alloc_beg+ 2 * sizeof(uptr), chunk_beg);
+      reinterpret_cast<uptr *>(alloc_beg)[0] = kAllocBegMagic;
+      reinterpret_cast<uptr *>(alloc_beg)[1] = chunk_beg;
+    }
+    if (using_primary_allocator) {
+      CHECK(size);
+      m->user_requested_size = size;
+      CHECK(allocator.FromPrimary(allocated));
+    } else {
+      CHECK(!allocator.FromPrimary(allocated));
+      m->user_requested_size = SizeClassMap::kMaxSize;
+      uptr *meta = reinterpret_cast<uptr *>(allocator.GetMetaData(allocated));
+      meta[0] = size;
+      meta[1] = chunk_beg;
+    }
+
+    m->alloc_context_id = StackDepotPut(*stack);
+
+    uptr size_rounded_down_to_granularity =
+        RoundDownTo(size, SHADOW_GRANULARITY);
+    // Unpoison the bulk of the memory region.
+    if (size_rounded_down_to_granularity)
+      PoisonShadow(user_beg, size_rounded_down_to_granularity, 0);
+    // Deal with the end of the region if size is not aligned to granularity.
+    if (size != size_rounded_down_to_granularity && CanPoisonMemory()) {
+      u8 *shadow =
+          (u8 *)MemToShadow(user_beg + size_rounded_down_to_granularity);
+      *shadow = fl.poison_partial ? (size & (SHADOW_GRANULARITY - 1)) : 0;
+    }
+
+    AsanStats &thread_stats = GetCurrentThreadStats();
+    thread_stats.mallocs++;
+    thread_stats.malloced += size;
+    thread_stats.malloced_redzones += needed_size - size;
+    uptr class_id =
+        Min(kNumberOfSizeClasses, SizeClassMap::ClassID(needed_size));
+    thread_stats.malloced_by_size[class_id]++;
+    if (needed_size > SizeClassMap::kMaxSize)
+      thread_stats.malloc_large++;
+
+    void *res = reinterpret_cast<void *>(user_beg);
+    if (can_fill && fl.max_malloc_fill_size) {
+      uptr fill_size = Min(size, (uptr)fl.max_malloc_fill_size);
+      REAL(memset)(res, fl.malloc_fill_byte, fill_size);
+    }
+#if CAN_SANITIZE_LEAKS
+    m->lsan_tag = __lsan::DisabledInThisThread() ? __lsan::kIgnored
+                                                 : __lsan::kDirectlyLeaked;
+#endif
+    // Must be the last mutation of metadata in this function.
+    atomic_store((atomic_uint8_t *)m, CHUNK_ALLOCATED, memory_order_release);
+    ASAN_MALLOC_HOOK(res, size);
+    return res;
+  }
+
+  void AtomicallySetQuarantineFlag(AsanChunk *m, void *ptr,
+                                   BufferedStackTrace *stack) {
+    u8 old_chunk_state = CHUNK_ALLOCATED;
+    // Flip the chunk_state atomically to avoid race on double-free.
+    if (!atomic_compare_exchange_strong((atomic_uint8_t*)m, &old_chunk_state,
+                                        CHUNK_QUARANTINE, memory_order_acquire))
+      ReportInvalidFree(ptr, old_chunk_state, stack);
+    CHECK_EQ(CHUNK_ALLOCATED, old_chunk_state);
+  }
+
+  // Expects the chunk to already be marked as quarantined by using
+  // AtomicallySetQuarantineFlag.
+  void QuarantineChunk(AsanChunk *m, void *ptr, BufferedStackTrace *stack,
+                       AllocType alloc_type) {
+    CHECK_EQ(m->chunk_state, CHUNK_QUARANTINE);
+
+    if (m->alloc_type != alloc_type) {
+      if (atomic_load(&alloc_dealloc_mismatch, memory_order_acquire)) {
+        ReportAllocTypeMismatch((uptr)ptr, stack, (AllocType)m->alloc_type,
+                                (AllocType)alloc_type);
+      }
+    }
+
+    CHECK_GE(m->alloc_tid, 0);
+    if (SANITIZER_WORDSIZE == 64)  // On 32-bits this resides in user area.
+      CHECK_EQ(m->free_tid, kInvalidTid);
+    AsanThread *t = GetCurrentThread();
+    m->free_tid = t ? t->tid() : 0;
+    m->free_context_id = StackDepotPut(*stack);
+    // Poison the region.
+    PoisonShadow(m->Beg(),
+                 RoundUpTo(m->UsedSize(), SHADOW_GRANULARITY),
+                 kAsanHeapFreeMagic);
+
+    AsanStats &thread_stats = GetCurrentThreadStats();
+    thread_stats.frees++;
+    thread_stats.freed += m->UsedSize();
+
+    // Push into quarantine.
+    if (t) {
+      AsanThreadLocalMallocStorage *ms = &t->malloc_storage();
+      AllocatorCache *ac = GetAllocatorCache(ms);
+      quarantine.Put(GetQuarantineCache(ms), QuarantineCallback(ac), m,
+                           m->UsedSize());
+    } else {
+      SpinMutexLock l(&fallback_mutex);
+      AllocatorCache *ac = &fallback_allocator_cache;
+      quarantine.Put(&fallback_quarantine_cache, QuarantineCallback(ac), m,
+                           m->UsedSize());
+    }
+  }
+
+  void Deallocate(void *ptr, uptr delete_size, BufferedStackTrace *stack,
+                  AllocType alloc_type) {
+    uptr p = reinterpret_cast<uptr>(ptr);
+    if (p == 0) return;
+
+    uptr chunk_beg = p - kChunkHeaderSize;
+    AsanChunk *m = reinterpret_cast<AsanChunk *>(chunk_beg);
+    if (delete_size && flags()->new_delete_type_mismatch &&
+        delete_size != m->UsedSize()) {
+      ReportNewDeleteSizeMismatch(p, delete_size, stack);
+    }
+    ASAN_FREE_HOOK(ptr);
+    // Must mark the chunk as quarantined before any changes to its metadata.
+    AtomicallySetQuarantineFlag(m, ptr, stack);
+    QuarantineChunk(m, ptr, stack, alloc_type);
+  }
+
+  void *Reallocate(void *old_ptr, uptr new_size, BufferedStackTrace *stack) {
+    CHECK(old_ptr && new_size);
+    uptr p = reinterpret_cast<uptr>(old_ptr);
+    uptr chunk_beg = p - kChunkHeaderSize;
+    AsanChunk *m = reinterpret_cast<AsanChunk *>(chunk_beg);
+
+    AsanStats &thread_stats = GetCurrentThreadStats();
+    thread_stats.reallocs++;
+    thread_stats.realloced += new_size;
+
+    void *new_ptr = Allocate(new_size, 8, stack, FROM_MALLOC, true);
+    if (new_ptr) {
+      u8 chunk_state = m->chunk_state;
+      if (chunk_state != CHUNK_ALLOCATED)
+        ReportInvalidFree(old_ptr, chunk_state, stack);
+      CHECK_NE(REAL(memcpy), (void*)0);
+      uptr memcpy_size = Min(new_size, m->UsedSize());
+      // If realloc() races with free(), we may start copying freed memory.
+      // However, we will report racy double-free later anyway.
+      REAL(memcpy)(new_ptr, old_ptr, memcpy_size);
+      Deallocate(old_ptr, 0, stack, FROM_MALLOC);
+    }
+    return new_ptr;
+  }
+
+  void *Calloc(uptr nmemb, uptr size, BufferedStackTrace *stack) {
+    if (CallocShouldReturnNullDueToOverflow(size, nmemb))
+      return allocator.ReturnNullOrDie();
+    void *ptr = Allocate(nmemb * size, 8, stack, FROM_MALLOC, false);
+    // If the memory comes from the secondary allocator no need to clear it
+    // as it comes directly from mmap.
+    if (ptr && allocator.FromPrimary(ptr))
+      REAL(memset)(ptr, 0, nmemb * size);
+    return ptr;
+  }
+
+  void ReportInvalidFree(void *ptr, u8 chunk_state, BufferedStackTrace *stack) {
+    if (chunk_state == CHUNK_QUARANTINE)
+      ReportDoubleFree((uptr)ptr, stack);
+    else
+      ReportFreeNotMalloced((uptr)ptr, stack);
+  }
+
+  void CommitBack(AsanThreadLocalMallocStorage *ms) {
+    AllocatorCache *ac = GetAllocatorCache(ms);
+    quarantine.Drain(GetQuarantineCache(ms), QuarantineCallback(ac));
+    allocator.SwallowCache(ac);
+  }
+
+  // -------------------------- Chunk lookup ----------------------
+
+  // Assumes alloc_beg == allocator.GetBlockBegin(alloc_beg).
+  AsanChunk *GetAsanChunk(void *alloc_beg) {
+    if (!alloc_beg) return 0;
+    if (!allocator.FromPrimary(alloc_beg)) {
+      uptr *meta = reinterpret_cast<uptr *>(allocator.GetMetaData(alloc_beg));
+      AsanChunk *m = reinterpret_cast<AsanChunk *>(meta[1]);
+      return m;
+    }
+    uptr *alloc_magic = reinterpret_cast<uptr *>(alloc_beg);
+    if (alloc_magic[0] == kAllocBegMagic)
+      return reinterpret_cast<AsanChunk *>(alloc_magic[1]);
+    return reinterpret_cast<AsanChunk *>(alloc_beg);
+  }
+
+  AsanChunk *GetAsanChunkByAddr(uptr p) {
+    void *alloc_beg = allocator.GetBlockBegin(reinterpret_cast<void *>(p));
+    return GetAsanChunk(alloc_beg);
+  }
+
+  // Allocator must be locked when this function is called.
+  AsanChunk *GetAsanChunkByAddrFastLocked(uptr p) {
+    void *alloc_beg =
+        allocator.GetBlockBeginFastLocked(reinterpret_cast<void *>(p));
+    return GetAsanChunk(alloc_beg);
+  }
+
+  uptr AllocationSize(uptr p) {
+    AsanChunk *m = GetAsanChunkByAddr(p);
+    if (!m) return 0;
+    if (m->chunk_state != CHUNK_ALLOCATED) return 0;
+    if (m->Beg() != p) return 0;
+    return m->UsedSize();
+  }
+
+  AsanChunkView FindHeapChunkByAddress(uptr addr) {
+    AsanChunk *m1 = GetAsanChunkByAddr(addr);
+    if (!m1) return AsanChunkView(m1);
+    sptr offset = 0;
+    if (AsanChunkView(m1).AddrIsAtLeft(addr, 1, &offset)) {
+      // The address is in the chunk's left redzone, so maybe it is actually
+      // a right buffer overflow from the other chunk to the left.
+      // Search a bit to the left to see if there is another chunk.
+      AsanChunk *m2 = 0;
+      for (uptr l = 1; l < GetPageSizeCached(); l++) {
+        m2 = GetAsanChunkByAddr(addr - l);
+        if (m2 == m1) continue;  // Still the same chunk.
+        break;
+      }
+      if (m2 && AsanChunkView(m2).AddrIsAtRight(addr, 1, &offset))
+        m1 = ChooseChunk(addr, m2, m1);
+    }
+    return AsanChunkView(m1);
+  }
+
+  void PrintStats() {
+    allocator.PrintStats();
+  }
+
+  void ForceLock() {
+    allocator.ForceLock();
+    fallback_mutex.Lock();
+  }
+
+  void ForceUnlock() {
+    fallback_mutex.Unlock();
+    allocator.ForceUnlock();
+  }
+};
+
+static Allocator instance(LINKER_INITIALIZED);
+
+static AsanAllocator &get_allocator() {
+  return instance.allocator;
+}
+
+bool AsanChunkView::IsValid() {
+  return chunk_ != 0 && chunk_->chunk_state != CHUNK_AVAILABLE;
+}
+uptr AsanChunkView::Beg() { return chunk_->Beg(); }
+uptr AsanChunkView::End() { return Beg() + UsedSize(); }
+uptr AsanChunkView::UsedSize() { return chunk_->UsedSize(); }
+uptr AsanChunkView::AllocTid() { return chunk_->alloc_tid; }
+uptr AsanChunkView::FreeTid() { return chunk_->free_tid; }
+
+static StackTrace GetStackTraceFromId(u32 id) {
+  CHECK(id);
+  StackTrace res = StackDepotGet(id);
+  CHECK(res.trace);
+  return res;
+}
+
+StackTrace AsanChunkView::GetAllocStack() {
+  return GetStackTraceFromId(chunk_->alloc_context_id);
+}
+
+StackTrace AsanChunkView::GetFreeStack() {
+  return GetStackTraceFromId(chunk_->free_context_id);
+}
+
+void InitializeAllocator(const AllocatorOptions &options) {
+  instance.Initialize(options);
+}
+
+void ReInitializeAllocator(const AllocatorOptions &options) {
+  instance.ReInitialize(options);
+}
+
+void GetAllocatorOptions(AllocatorOptions *options) {
+  instance.GetOptions(options);
+}
+
+AsanChunkView FindHeapChunkByAddress(uptr addr) {
+  return instance.FindHeapChunkByAddress(addr);
+}
+
+void AsanThreadLocalMallocStorage::CommitBack() {
+  instance.CommitBack(this);
+}
+
+void PrintInternalAllocatorStats() {
+  instance.PrintStats();
+}
+
+void *asan_memalign(uptr alignment, uptr size, BufferedStackTrace *stack,
+                    AllocType alloc_type) {
+  return instance.Allocate(size, alignment, stack, alloc_type, true);
+}
+
+void asan_free(void *ptr, BufferedStackTrace *stack, AllocType alloc_type) {
+  instance.Deallocate(ptr, 0, stack, alloc_type);
+}
+
+void asan_sized_free(void *ptr, uptr size, BufferedStackTrace *stack,
+                     AllocType alloc_type) {
+  instance.Deallocate(ptr, size, stack, alloc_type);
+}
+
+void *asan_malloc(uptr size, BufferedStackTrace *stack) {
+  return instance.Allocate(size, 8, stack, FROM_MALLOC, true);
+}
+
+void *asan_calloc(uptr nmemb, uptr size, BufferedStackTrace *stack) {
+  return instance.Calloc(nmemb, size, stack);
+}
+
+void *asan_realloc(void *p, uptr size, BufferedStackTrace *stack) {
+  if (p == 0)
+    return instance.Allocate(size, 8, stack, FROM_MALLOC, true);
+  if (size == 0) {
+    instance.Deallocate(p, 0, stack, FROM_MALLOC);
+    return 0;
+  }
+  return instance.Reallocate(p, size, stack);
+}
+
+void *asan_valloc(uptr size, BufferedStackTrace *stack) {
+  return instance.Allocate(size, GetPageSizeCached(), stack, FROM_MALLOC, true);
+}
+
+void *asan_pvalloc(uptr size, BufferedStackTrace *stack) {
+  uptr PageSize = GetPageSizeCached();
+  size = RoundUpTo(size, PageSize);
+  if (size == 0) {
+    // pvalloc(0) should allocate one page.
+    size = PageSize;
+  }
+  return instance.Allocate(size, PageSize, stack, FROM_MALLOC, true);
+}
+
+int asan_posix_memalign(void **memptr, uptr alignment, uptr size,
+                        BufferedStackTrace *stack) {
+  void *ptr = instance.Allocate(size, alignment, stack, FROM_MALLOC, true);
+  CHECK(IsAligned((uptr)ptr, alignment));
+  *memptr = ptr;
+  return 0;
+}
+
+uptr asan_malloc_usable_size(void *ptr, uptr pc, uptr bp) {
+  if (ptr == 0) return 0;
+  uptr usable_size = instance.AllocationSize(reinterpret_cast<uptr>(ptr));
+  if (flags()->check_malloc_usable_size && (usable_size == 0)) {
+    GET_STACK_TRACE_FATAL(pc, bp);
+    ReportMallocUsableSizeNotOwned((uptr)ptr, &stack);
+  }
+  return usable_size;
+}
+
+uptr asan_mz_size(const void *ptr) {
+  return instance.AllocationSize(reinterpret_cast<uptr>(ptr));
+}
+
+void asan_mz_force_lock() {
+  instance.ForceLock();
+}
+
+void asan_mz_force_unlock() {
+  instance.ForceUnlock();
+}
+
+void AsanSoftRssLimitExceededCallback(bool exceeded) {
+  instance.allocator.SetRssLimitIsExceeded(exceeded);
+}
+
+}  // namespace __asan
+
+// --- Implementation of LSan-specific functions --- {{{1
+namespace __lsan {
+void LockAllocator() {
+  __asan::get_allocator().ForceLock();
+}
+
+void UnlockAllocator() {
+  __asan::get_allocator().ForceUnlock();
+}
+
+void GetAllocatorGlobalRange(uptr *begin, uptr *end) {
+  *begin = (uptr)&__asan::get_allocator();
+  *end = *begin + sizeof(__asan::get_allocator());
+}
+
+uptr PointsIntoChunk(void* p) {
+  uptr addr = reinterpret_cast<uptr>(p);
+  __asan::AsanChunk *m = __asan::instance.GetAsanChunkByAddrFastLocked(addr);
+  if (!m) return 0;
+  uptr chunk = m->Beg();
+  if (m->chunk_state != __asan::CHUNK_ALLOCATED)
+    return 0;
+  if (m->AddrIsInside(addr, /*locked_version=*/true))
+    return chunk;
+  if (IsSpecialCaseOfOperatorNew0(chunk, m->UsedSize(/*locked_version*/ true),
+                                  addr))
+    return chunk;
+  return 0;
+}
+
+uptr GetUserBegin(uptr chunk) {
+  __asan::AsanChunk *m = __asan::instance.GetAsanChunkByAddrFastLocked(chunk);
+  CHECK(m);
+  return m->Beg();
+}
+
+LsanMetadata::LsanMetadata(uptr chunk) {
+  metadata_ = reinterpret_cast<void *>(chunk - __asan::kChunkHeaderSize);
+}
+
+bool LsanMetadata::allocated() const {
+  __asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
+  return m->chunk_state == __asan::CHUNK_ALLOCATED;
+}
+
+ChunkTag LsanMetadata::tag() const {
+  __asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
+  return static_cast<ChunkTag>(m->lsan_tag);
+}
+
+void LsanMetadata::set_tag(ChunkTag value) {
+  __asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
+  m->lsan_tag = value;
+}
+
+uptr LsanMetadata::requested_size() const {
+  __asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
+  return m->UsedSize(/*locked_version=*/true);
+}
+
+u32 LsanMetadata::stack_trace_id() const {
+  __asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
+  return m->alloc_context_id;
+}
+
+void ForEachChunk(ForEachChunkCallback callback, void *arg) {
+  __asan::get_allocator().ForEachChunk(callback, arg);
+}
+
+IgnoreObjectResult IgnoreObjectLocked(const void *p) {
+  uptr addr = reinterpret_cast<uptr>(p);
+  __asan::AsanChunk *m = __asan::instance.GetAsanChunkByAddr(addr);
+  if (!m) return kIgnoreObjectInvalid;
+  if ((m->chunk_state == __asan::CHUNK_ALLOCATED) && m->AddrIsInside(addr)) {
+    if (m->lsan_tag == kIgnored)
+      return kIgnoreObjectAlreadyIgnored;
+    m->lsan_tag = __lsan::kIgnored;
+    return kIgnoreObjectSuccess;
+  } else {
+    return kIgnoreObjectInvalid;
+  }
+}
+}  // namespace __lsan
+
+// ---------------------- Interface ---------------- {{{1
+using namespace __asan;  // NOLINT
+
+// ASan allocator doesn't reserve extra bytes, so normally we would
+// just return "size". We don't want to expose our redzone sizes, etc here.
+uptr __sanitizer_get_estimated_allocated_size(uptr size) {
+  return size;
+}
+
+int __sanitizer_get_ownership(const void *p) {
+  uptr ptr = reinterpret_cast<uptr>(p);
+  return instance.AllocationSize(ptr) > 0;
+}
+
+uptr __sanitizer_get_allocated_size(const void *p) {
+  if (p == 0) return 0;
+  uptr ptr = reinterpret_cast<uptr>(p);
+  uptr allocated_size = instance.AllocationSize(ptr);
+  // Die if p is not malloced or if it is already freed.
+  if (allocated_size == 0) {
+    GET_STACK_TRACE_FATAL_HERE;
+    ReportSanitizerGetAllocatedSizeNotOwned(ptr, &stack);
+  }
+  return allocated_size;
+}
+
+#if !SANITIZER_SUPPORTS_WEAK_HOOKS
+// Provide default (no-op) implementation of malloc hooks.
+extern "C" {
+SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
+void __sanitizer_malloc_hook(void *ptr, uptr size) {
+  (void)ptr;
+  (void)size;
+}
+SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
+void __sanitizer_free_hook(void *ptr) {
+  (void)ptr;
+}
+}  // extern "C"
+#endif
diff --git a/contrib/compiler-rt/lib/asan/asan_allocator.h b/contrib/compiler-rt/lib/asan/asan_allocator.h
index 6d3a99282a4a..3208d1f950cd 100644
--- a/contrib/compiler-rt/lib/asan/asan_allocator.h
+++ b/contrib/compiler-rt/lib/asan/asan_allocator.h
@@ -9,12 +9,13 @@
 //
 // This file is a part of AddressSanitizer, an address sanity checker.
 //
-// ASan-private header for asan_allocator2.cc.
+// ASan-private header for asan_allocator.cc.
 //===----------------------------------------------------------------------===//
 
 #ifndef ASAN_ALLOCATOR_H
 #define ASAN_ALLOCATOR_H
 
+#include "asan_flags.h"
 #include "asan_internal.h"
 #include "asan_interceptors.h"
 #include "sanitizer_common/sanitizer_allocator.h"
@@ -31,8 +32,20 @@ enum AllocType {
 static const uptr kNumberOfSizeClasses = 255;
 struct AsanChunk;
 
-void InitializeAllocator();
-void ReInitializeAllocator();
+struct AllocatorOptions {
+  u32 quarantine_size_mb;
+  u16 min_redzone;
+  u16 max_redzone;
+  u8 may_return_null;
+  u8 alloc_dealloc_mismatch;
+
+  void SetFrom(const Flags *f, const CommonFlags *cf);
+  void CopyTo(Flags *f, CommonFlags *cf);
+};
+
+void InitializeAllocator(const AllocatorOptions &options);
+void ReInitializeAllocator(const AllocatorOptions &options);
+void GetAllocatorOptions(AllocatorOptions *options);
 
 class AsanChunkView {
  public:
@@ -127,12 +140,12 @@ typedef SizeClassAllocator32<0, SANITIZER_MMAP_RANGE_SIZE, 16,
 typedef SizeClassAllocatorLocalCache<PrimaryAllocator> AllocatorCache;
 typedef LargeMmapAllocator<AsanMapUnmapCallback> SecondaryAllocator;
 typedef CombinedAllocator<PrimaryAllocator, AllocatorCache,
-    SecondaryAllocator> Allocator;
+    SecondaryAllocator> AsanAllocator;
 
 
 struct AsanThreadLocalMallocStorage {
   uptr quarantine_cache[16];
-  AllocatorCache allocator2_cache;
+  AllocatorCache allocator_cache;
   void CommitBack();
  private:
   // These objects are allocated via mmap() and are zero-initialized.
@@ -160,6 +173,7 @@ void asan_mz_force_lock();
 void asan_mz_force_unlock();
 
 void PrintInternalAllocatorStats();
+void AsanSoftRssLimitExceededCallback(bool exceeded);
 
 }  // namespace __asan
 #endif  // ASAN_ALLOCATOR_H
diff --git a/contrib/compiler-rt/lib/asan/asan_allocator2.cc b/contrib/compiler-rt/lib/asan/asan_allocator2.cc
deleted file mode 100644
index 52bdcf607f57..000000000000
--- a/contrib/compiler-rt/lib/asan/asan_allocator2.cc
+++ /dev/null
@@ -1,792 +0,0 @@
-//===-- asan_allocator2.cc ------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file is a part of AddressSanitizer, an address sanity checker.
-//
-// Implementation of ASan's memory allocator, 2-nd version.
-// This variant uses the allocator from sanitizer_common, i.e. the one shared
-// with ThreadSanitizer and MemorySanitizer.
-//
-//===----------------------------------------------------------------------===//
-#include "asan_allocator.h"
-
-#include "asan_mapping.h"
-#include "asan_poisoning.h"
-#include "asan_report.h"
-#include "asan_stack.h"
-#include "asan_thread.h"
-#include "sanitizer_common/sanitizer_allocator_interface.h"
-#include "sanitizer_common/sanitizer_flags.h"
-#include "sanitizer_common/sanitizer_internal_defs.h"
-#include "sanitizer_common/sanitizer_list.h"
-#include "sanitizer_common/sanitizer_stackdepot.h"
-#include "sanitizer_common/sanitizer_quarantine.h"
-#include "lsan/lsan_common.h"
-
-namespace __asan {
-
-void AsanMapUnmapCallback::OnMap(uptr p, uptr size) const {
-  PoisonShadow(p, size, kAsanHeapLeftRedzoneMagic);
-  // Statistics.
-  AsanStats &thread_stats = GetCurrentThreadStats();
-  thread_stats.mmaps++;
-  thread_stats.mmaped += size;
-}
-void AsanMapUnmapCallback::OnUnmap(uptr p, uptr size) const {
-  PoisonShadow(p, size, 0);
-  // We are about to unmap a chunk of user memory.
-  // Mark the corresponding shadow memory as not needed.
-  FlushUnneededASanShadowMemory(p, size);
-  // Statistics.
-  AsanStats &thread_stats = GetCurrentThreadStats();
-  thread_stats.munmaps++;
-  thread_stats.munmaped += size;
-}
-
-// We can not use THREADLOCAL because it is not supported on some of the
-// platforms we care about (OSX 10.6, Android).
-// static THREADLOCAL AllocatorCache cache;
-AllocatorCache *GetAllocatorCache(AsanThreadLocalMallocStorage *ms) {
-  CHECK(ms);
-  return &ms->allocator2_cache;
-}
-
-static Allocator allocator;
-
-static const uptr kMaxAllowedMallocSize =
-  FIRST_32_SECOND_64(3UL << 30, 64UL << 30);
-
-static const uptr kMaxThreadLocalQuarantine =
-  FIRST_32_SECOND_64(1 << 18, 1 << 20);
-
-// Every chunk of memory allocated by this allocator can be in one of 3 states:
-// CHUNK_AVAILABLE: the chunk is in the free list and ready to be allocated.
-// CHUNK_ALLOCATED: the chunk is allocated and not yet freed.
-// CHUNK_QUARANTINE: the chunk was freed and put into quarantine zone.
-enum {
-  CHUNK_AVAILABLE  = 0,  // 0 is the default value even if we didn't set it.
-  CHUNK_ALLOCATED  = 2,
-  CHUNK_QUARANTINE = 3
-};
-
-// Valid redzone sizes are 16, 32, 64, ... 2048, so we encode them in 3 bits.
-// We use adaptive redzones: for larger allocation larger redzones are used.
-static u32 RZLog2Size(u32 rz_log) {
-  CHECK_LT(rz_log, 8);
-  return 16 << rz_log;
-}
-
-static u32 RZSize2Log(u32 rz_size) {
-  CHECK_GE(rz_size, 16);
-  CHECK_LE(rz_size, 2048);
-  CHECK(IsPowerOfTwo(rz_size));
-  u32 res = Log2(rz_size) - 4;
-  CHECK_EQ(rz_size, RZLog2Size(res));
-  return res;
-}
-
-static uptr ComputeRZLog(uptr user_requested_size) {
-  u32 rz_log =
-    user_requested_size <= 64        - 16   ? 0 :
-    user_requested_size <= 128       - 32   ? 1 :
-    user_requested_size <= 512       - 64   ? 2 :
-    user_requested_size <= 4096      - 128  ? 3 :
-    user_requested_size <= (1 << 14) - 256  ? 4 :
-    user_requested_size <= (1 << 15) - 512  ? 5 :
-    user_requested_size <= (1 << 16) - 1024 ? 6 : 7;
-  return Min(Max(rz_log, RZSize2Log(flags()->redzone)),
-             RZSize2Log(flags()->max_redzone));
-}
-
-// The memory chunk allocated from the underlying allocator looks like this:
-// L L L L L L H H U U U U U U R R
-//   L -- left redzone words (0 or more bytes)
-//   H -- ChunkHeader (16 bytes), which is also a part of the left redzone.
-//   U -- user memory.
-//   R -- right redzone (0 or more bytes)
-// ChunkBase consists of ChunkHeader and other bytes that overlap with user
-// memory.
-
-// If the left redzone is greater than the ChunkHeader size we store a magic
-// value in the first uptr word of the memory block and store the address of
-// ChunkBase in the next uptr.
-// M B L L L L L L L L L  H H U U U U U U
-//   |                    ^
-//   ---------------------|
-//   M -- magic value kAllocBegMagic
-//   B -- address of ChunkHeader pointing to the first 'H'
-static const uptr kAllocBegMagic = 0xCC6E96B9;
-
-struct ChunkHeader {
-  // 1-st 8 bytes.
-  u32 chunk_state       : 8;  // Must be first.
-  u32 alloc_tid         : 24;
-
-  u32 free_tid          : 24;
-  u32 from_memalign     : 1;
-  u32 alloc_type        : 2;
-  u32 rz_log            : 3;
-  u32 lsan_tag          : 2;
-  // 2-nd 8 bytes
-  // This field is used for small sizes. For large sizes it is equal to
-  // SizeClassMap::kMaxSize and the actual size is stored in the
-  // SecondaryAllocator's metadata.
-  u32 user_requested_size;
-  u32 alloc_context_id;
-};
-
-struct ChunkBase : ChunkHeader {
-  // Header2, intersects with user memory.
-  u32 free_context_id;
-};
-
-static const uptr kChunkHeaderSize = sizeof(ChunkHeader);
-static const uptr kChunkHeader2Size = sizeof(ChunkBase) - kChunkHeaderSize;
-COMPILER_CHECK(kChunkHeaderSize == 16);
-COMPILER_CHECK(kChunkHeader2Size <= 16);
-
-struct AsanChunk: ChunkBase {
-  uptr Beg() { return reinterpret_cast<uptr>(this) + kChunkHeaderSize; }
-  uptr UsedSize(bool locked_version = false) {
-    if (user_requested_size != SizeClassMap::kMaxSize)
-      return user_requested_size;
-    return *reinterpret_cast<uptr *>(
-                allocator.GetMetaData(AllocBeg(locked_version)));
-  }
-  void *AllocBeg(bool locked_version = false) {
-    if (from_memalign) {
-      if (locked_version)
-        return allocator.GetBlockBeginFastLocked(
-            reinterpret_cast<void *>(this));
-      return allocator.GetBlockBegin(reinterpret_cast<void *>(this));
-    }
-    return reinterpret_cast<void*>(Beg() - RZLog2Size(rz_log));
-  }
-  bool AddrIsInside(uptr addr, bool locked_version = false) {
-    return (addr >= Beg()) && (addr < Beg() + UsedSize(locked_version));
-  }
-};
-
-bool AsanChunkView::IsValid() {
-  return chunk_ != 0 && chunk_->chunk_state != CHUNK_AVAILABLE;
-}
-uptr AsanChunkView::Beg() { return chunk_->Beg(); }
-uptr AsanChunkView::End() { return Beg() + UsedSize(); }
-uptr AsanChunkView::UsedSize() { return chunk_->UsedSize(); }
-uptr AsanChunkView::AllocTid() { return chunk_->alloc_tid; }
-uptr AsanChunkView::FreeTid() { return chunk_->free_tid; }
-
-static StackTrace GetStackTraceFromId(u32 id) {
-  CHECK(id);
-  StackTrace res = StackDepotGet(id);
-  CHECK(res.trace);
-  return res;
-}
-
-StackTrace AsanChunkView::GetAllocStack() {
-  return GetStackTraceFromId(chunk_->alloc_context_id);
-}
-
-StackTrace AsanChunkView::GetFreeStack() {
-  return GetStackTraceFromId(chunk_->free_context_id);
-}
-
-struct QuarantineCallback;
-typedef Quarantine<QuarantineCallback, AsanChunk> AsanQuarantine;
-typedef AsanQuarantine::Cache QuarantineCache;
-static AsanQuarantine quarantine(LINKER_INITIALIZED);
-static QuarantineCache fallback_quarantine_cache(LINKER_INITIALIZED);
-static AllocatorCache fallback_allocator_cache;
-static SpinMutex fallback_mutex;
-
-QuarantineCache *GetQuarantineCache(AsanThreadLocalMallocStorage *ms) {
-  CHECK(ms);
-  CHECK_LE(sizeof(QuarantineCache), sizeof(ms->quarantine_cache));
-  return reinterpret_cast<QuarantineCache *>(ms->quarantine_cache);
-}
-
-struct QuarantineCallback {
-  explicit QuarantineCallback(AllocatorCache *cache)
-      : cache_(cache) {
-  }
-
-  void Recycle(AsanChunk *m) {
-    CHECK_EQ(m->chunk_state, CHUNK_QUARANTINE);
-    atomic_store((atomic_uint8_t*)m, CHUNK_AVAILABLE, memory_order_relaxed);
-    CHECK_NE(m->alloc_tid, kInvalidTid);
-    CHECK_NE(m->free_tid, kInvalidTid);
-    PoisonShadow(m->Beg(),
-                 RoundUpTo(m->UsedSize(), SHADOW_GRANULARITY),
-                 kAsanHeapLeftRedzoneMagic);
-    void *p = reinterpret_cast<void *>(m->AllocBeg());
-    if (p != m) {
-      uptr *alloc_magic = reinterpret_cast<uptr *>(p);
-      CHECK_EQ(alloc_magic[0], kAllocBegMagic);
-      // Clear the magic value, as allocator internals may overwrite the
-      // contents of deallocated chunk, confusing GetAsanChunk lookup.
-      alloc_magic[0] = 0;
-      CHECK_EQ(alloc_magic[1], reinterpret_cast<uptr>(m));
-    }
-
-    // Statistics.
-    AsanStats &thread_stats = GetCurrentThreadStats();
-    thread_stats.real_frees++;
-    thread_stats.really_freed += m->UsedSize();
-
-    allocator.Deallocate(cache_, p);
-  }
-
-  void *Allocate(uptr size) {
-    return allocator.Allocate(cache_, size, 1, false);
-  }
-
-  void Deallocate(void *p) {
-    allocator.Deallocate(cache_, p);
-  }
-
-  AllocatorCache *cache_;
-};
-
-void InitializeAllocator() {
-  allocator.Init();
-  quarantine.Init((uptr)flags()->quarantine_size, kMaxThreadLocalQuarantine);
-}
-
-void ReInitializeAllocator() {
-  quarantine.Init((uptr)flags()->quarantine_size, kMaxThreadLocalQuarantine);
-}
-
-static void *Allocate(uptr size, uptr alignment, BufferedStackTrace *stack,
-                      AllocType alloc_type, bool can_fill) {
-  if (UNLIKELY(!asan_inited))
-    AsanInitFromRtl();
-  Flags &fl = *flags();
-  CHECK(stack);
-  const uptr min_alignment = SHADOW_GRANULARITY;
-  if (alignment < min_alignment)
-    alignment = min_alignment;
-  if (size == 0) {
-    // We'd be happy to avoid allocating memory for zero-size requests, but
-    // some programs/tests depend on this behavior and assume that malloc would
-    // not return NULL even for zero-size allocations. Moreover, it looks like
-    // operator new should never return NULL, and results of consecutive "new"
-    // calls must be different even if the allocated size is zero.
-    size = 1;
-  }
-  CHECK(IsPowerOfTwo(alignment));
-  uptr rz_log = ComputeRZLog(size);
-  uptr rz_size = RZLog2Size(rz_log);
-  uptr rounded_size = RoundUpTo(Max(size, kChunkHeader2Size), alignment);
-  uptr needed_size = rounded_size + rz_size;
-  if (alignment > min_alignment)
-    needed_size += alignment;
-  bool using_primary_allocator = true;
-  // If we are allocating from the secondary allocator, there will be no
-  // automatic right redzone, so add the right redzone manually.
-  if (!PrimaryAllocator::CanAllocate(needed_size, alignment)) {
-    needed_size += rz_size;
-    using_primary_allocator = false;
-  }
-  CHECK(IsAligned(needed_size, min_alignment));
-  if (size > kMaxAllowedMallocSize || needed_size > kMaxAllowedMallocSize) {
-    Report("WARNING: AddressSanitizer failed to allocate %p bytes\n",
-           (void*)size);
-    return AllocatorReturnNull();
-  }
-
-  AsanThread *t = GetCurrentThread();
-  void *allocated;
-  if (t) {
-    AllocatorCache *cache = GetAllocatorCache(&t->malloc_storage());
-    allocated = allocator.Allocate(cache, needed_size, 8, false);
-  } else {
-    SpinMutexLock l(&fallback_mutex);
-    AllocatorCache *cache = &fallback_allocator_cache;
-    allocated = allocator.Allocate(cache, needed_size, 8, false);
-  }
-
-  if (*(u8 *)MEM_TO_SHADOW((uptr)allocated) == 0 && flags()->poison_heap) {
-    // Heap poisoning is enabled, but the allocator provides an unpoisoned
-    // chunk. This is possible if flags()->poison_heap was disabled for some
-    // time, for example, due to flags()->start_disabled.
-    // Anyway, poison the block before using it for anything else.
-    uptr allocated_size = allocator.GetActuallyAllocatedSize(allocated);
-    PoisonShadow((uptr)allocated, allocated_size, kAsanHeapLeftRedzoneMagic);
-  }
-
-  uptr alloc_beg = reinterpret_cast<uptr>(allocated);
-  uptr alloc_end = alloc_beg + needed_size;
-  uptr beg_plus_redzone = alloc_beg + rz_size;
-  uptr user_beg = beg_plus_redzone;
-  if (!IsAligned(user_beg, alignment))
-    user_beg = RoundUpTo(user_beg, alignment);
-  uptr user_end = user_beg + size;
-  CHECK_LE(user_end, alloc_end);
-  uptr chunk_beg = user_beg - kChunkHeaderSize;
-  AsanChunk *m = reinterpret_cast<AsanChunk *>(chunk_beg);
-  m->alloc_type = alloc_type;
-  m->rz_log = rz_log;
-  u32 alloc_tid = t ? t->tid() : 0;
-  m->alloc_tid = alloc_tid;
-  CHECK_EQ(alloc_tid, m->alloc_tid);  // Does alloc_tid fit into the bitfield?
-  m->free_tid = kInvalidTid;
-  m->from_memalign = user_beg != beg_plus_redzone;
-  if (alloc_beg != chunk_beg) {
-    CHECK_LE(alloc_beg+ 2 * sizeof(uptr), chunk_beg);
-    reinterpret_cast<uptr *>(alloc_beg)[0] = kAllocBegMagic;
-    reinterpret_cast<uptr *>(alloc_beg)[1] = chunk_beg;
-  }
-  if (using_primary_allocator) {
-    CHECK(size);
-    m->user_requested_size = size;
-    CHECK(allocator.FromPrimary(allocated));
-  } else {
-    CHECK(!allocator.FromPrimary(allocated));
-    m->user_requested_size = SizeClassMap::kMaxSize;
-    uptr *meta = reinterpret_cast<uptr *>(allocator.GetMetaData(allocated));
-    meta[0] = size;
-    meta[1] = chunk_beg;
-  }
-
-  m->alloc_context_id = StackDepotPut(*stack);
-
-  uptr size_rounded_down_to_granularity = RoundDownTo(size, SHADOW_GRANULARITY);
-  // Unpoison the bulk of the memory region.
-  if (size_rounded_down_to_granularity)
-    PoisonShadow(user_beg, size_rounded_down_to_granularity, 0);
-  // Deal with the end of the region if size is not aligned to granularity.
-  if (size != size_rounded_down_to_granularity && fl.poison_heap) {
-    u8 *shadow = (u8*)MemToShadow(user_beg + size_rounded_down_to_granularity);
-    *shadow = fl.poison_partial ? (size & (SHADOW_GRANULARITY - 1)) : 0;
-  }
-
-  AsanStats &thread_stats = GetCurrentThreadStats();
-  thread_stats.mallocs++;
-  thread_stats.malloced += size;
-  thread_stats.malloced_redzones += needed_size - size;
-  uptr class_id = Min(kNumberOfSizeClasses, SizeClassMap::ClassID(needed_size));
-  thread_stats.malloced_by_size[class_id]++;
-  if (needed_size > SizeClassMap::kMaxSize)
-    thread_stats.malloc_large++;
-
-  void *res = reinterpret_cast<void *>(user_beg);
-  if (can_fill && fl.max_malloc_fill_size) {
-    uptr fill_size = Min(size, (uptr)fl.max_malloc_fill_size);
-    REAL(memset)(res, fl.malloc_fill_byte, fill_size);
-  }
-#if CAN_SANITIZE_LEAKS
-  m->lsan_tag = __lsan::DisabledInThisThread() ? __lsan::kIgnored
-                                               : __lsan::kDirectlyLeaked;
-#endif
-  // Must be the last mutation of metadata in this function.
-  atomic_store((atomic_uint8_t *)m, CHUNK_ALLOCATED, memory_order_release);
-  ASAN_MALLOC_HOOK(res, size);
-  return res;
-}
-
-static void ReportInvalidFree(void *ptr, u8 chunk_state,
-                              BufferedStackTrace *stack) {
-  if (chunk_state == CHUNK_QUARANTINE)
-    ReportDoubleFree((uptr)ptr, stack);
-  else
-    ReportFreeNotMalloced((uptr)ptr, stack);
-}
-
-static void AtomicallySetQuarantineFlag(AsanChunk *m, void *ptr,
-                                        BufferedStackTrace *stack) {
-  u8 old_chunk_state = CHUNK_ALLOCATED;
-  // Flip the chunk_state atomically to avoid race on double-free.
-  if (!atomic_compare_exchange_strong((atomic_uint8_t*)m, &old_chunk_state,
-                                      CHUNK_QUARANTINE, memory_order_acquire))
-    ReportInvalidFree(ptr, old_chunk_state, stack);
-  CHECK_EQ(CHUNK_ALLOCATED, old_chunk_state);
-}
-
-// Expects the chunk to already be marked as quarantined by using
-// AtomicallySetQuarantineFlag.
-static void QuarantineChunk(AsanChunk *m, void *ptr, BufferedStackTrace *stack,
-                            AllocType alloc_type) {
-  CHECK_EQ(m->chunk_state, CHUNK_QUARANTINE);
-
-  if (m->alloc_type != alloc_type && flags()->alloc_dealloc_mismatch)
-    ReportAllocTypeMismatch((uptr)ptr, stack,
-                            (AllocType)m->alloc_type, (AllocType)alloc_type);
-
-  CHECK_GE(m->alloc_tid, 0);
-  if (SANITIZER_WORDSIZE == 64)  // On 32-bits this resides in user area.
-    CHECK_EQ(m->free_tid, kInvalidTid);
-  AsanThread *t = GetCurrentThread();
-  m->free_tid = t ? t->tid() : 0;
-  m->free_context_id = StackDepotPut(*stack);
-  // Poison the region.
-  PoisonShadow(m->Beg(),
-               RoundUpTo(m->UsedSize(), SHADOW_GRANULARITY),
-               kAsanHeapFreeMagic);
-
-  AsanStats &thread_stats = GetCurrentThreadStats();
-  thread_stats.frees++;
-  thread_stats.freed += m->UsedSize();
-
-  // Push into quarantine.
-  if (t) {
-    AsanThreadLocalMallocStorage *ms = &t->malloc_storage();
-    AllocatorCache *ac = GetAllocatorCache(ms);
-    quarantine.Put(GetQuarantineCache(ms), QuarantineCallback(ac),
-                   m, m->UsedSize());
-  } else {
-    SpinMutexLock l(&fallback_mutex);
-    AllocatorCache *ac = &fallback_allocator_cache;
-    quarantine.Put(&fallback_quarantine_cache, QuarantineCallback(ac),
-                   m, m->UsedSize());
-  }
-}
-
-static void Deallocate(void *ptr, uptr delete_size, BufferedStackTrace *stack,
-                       AllocType alloc_type) {
-  uptr p = reinterpret_cast<uptr>(ptr);
-  if (p == 0) return;
-
-  uptr chunk_beg = p - kChunkHeaderSize;
-  AsanChunk *m = reinterpret_cast<AsanChunk *>(chunk_beg);
-  if (delete_size && flags()->new_delete_type_mismatch &&
-      delete_size != m->UsedSize()) {
-    ReportNewDeleteSizeMismatch(p, delete_size, stack);
-  }
-  ASAN_FREE_HOOK(ptr);
-  // Must mark the chunk as quarantined before any changes to its metadata.
-  AtomicallySetQuarantineFlag(m, ptr, stack);
-  QuarantineChunk(m, ptr, stack, alloc_type);
-}
-
-static void *Reallocate(void *old_ptr, uptr new_size,
-                        BufferedStackTrace *stack) {
-  CHECK(old_ptr && new_size);
-  uptr p = reinterpret_cast<uptr>(old_ptr);
-  uptr chunk_beg = p - kChunkHeaderSize;
-  AsanChunk *m = reinterpret_cast<AsanChunk *>(chunk_beg);
-
-  AsanStats &thread_stats = GetCurrentThreadStats();
-  thread_stats.reallocs++;
-  thread_stats.realloced += new_size;
-
-  void *new_ptr = Allocate(new_size, 8, stack, FROM_MALLOC, true);
-  if (new_ptr) {
-    u8 chunk_state = m->chunk_state;
-    if (chunk_state != CHUNK_ALLOCATED)
-      ReportInvalidFree(old_ptr, chunk_state, stack);
-    CHECK_NE(REAL(memcpy), (void*)0);
-    uptr memcpy_size = Min(new_size, m->UsedSize());
-    // If realloc() races with free(), we may start copying freed memory.
-    // However, we will report racy double-free later anyway.
-    REAL(memcpy)(new_ptr, old_ptr, memcpy_size);
-    Deallocate(old_ptr, 0, stack, FROM_MALLOC);
-  }
-  return new_ptr;
-}
-
-// Assumes alloc_beg == allocator.GetBlockBegin(alloc_beg).
-static AsanChunk *GetAsanChunk(void *alloc_beg) {
-  if (!alloc_beg) return 0;
-  if (!allocator.FromPrimary(alloc_beg)) {
-    uptr *meta = reinterpret_cast<uptr *>(allocator.GetMetaData(alloc_beg));
-    AsanChunk *m = reinterpret_cast<AsanChunk *>(meta[1]);
-    return m;
-  }
-  uptr *alloc_magic = reinterpret_cast<uptr *>(alloc_beg);
-  if (alloc_magic[0] == kAllocBegMagic)
-    return reinterpret_cast<AsanChunk *>(alloc_magic[1]);
-  return reinterpret_cast<AsanChunk *>(alloc_beg);
-}
-
-static AsanChunk *GetAsanChunkByAddr(uptr p) {
-  void *alloc_beg = allocator.GetBlockBegin(reinterpret_cast<void *>(p));
-  return GetAsanChunk(alloc_beg);
-}
-
-// Allocator must be locked when this function is called.
-static AsanChunk *GetAsanChunkByAddrFastLocked(uptr p) {
-  void *alloc_beg =
-      allocator.GetBlockBeginFastLocked(reinterpret_cast<void *>(p));
-  return GetAsanChunk(alloc_beg);
-}
-
-static uptr AllocationSize(uptr p) {
-  AsanChunk *m = GetAsanChunkByAddr(p);
-  if (!m) return 0;
-  if (m->chunk_state != CHUNK_ALLOCATED) return 0;
-  if (m->Beg() != p) return 0;
-  return m->UsedSize();
-}
-
-// We have an address between two chunks, and we want to report just one.
-AsanChunk *ChooseChunk(uptr addr,
-                       AsanChunk *left_chunk, AsanChunk *right_chunk) {
-  // Prefer an allocated chunk over freed chunk and freed chunk
-  // over available chunk.
-  if (left_chunk->chunk_state != right_chunk->chunk_state) {
-    if (left_chunk->chunk_state == CHUNK_ALLOCATED)
-      return left_chunk;
-    if (right_chunk->chunk_state == CHUNK_ALLOCATED)
-      return right_chunk;
-    if (left_chunk->chunk_state == CHUNK_QUARANTINE)
-      return left_chunk;
-    if (right_chunk->chunk_state == CHUNK_QUARANTINE)
-      return right_chunk;
-  }
-  // Same chunk_state: choose based on offset.
-  sptr l_offset = 0, r_offset = 0;
-  CHECK(AsanChunkView(left_chunk).AddrIsAtRight(addr, 1, &l_offset));
-  CHECK(AsanChunkView(right_chunk).AddrIsAtLeft(addr, 1, &r_offset));
-  if (l_offset < r_offset)
-    return left_chunk;
-  return right_chunk;
-}
-
-AsanChunkView FindHeapChunkByAddress(uptr addr) {
-  AsanChunk *m1 = GetAsanChunkByAddr(addr);
-  if (!m1) return AsanChunkView(m1);
-  sptr offset = 0;
-  if (AsanChunkView(m1).AddrIsAtLeft(addr, 1, &offset)) {
-    // The address is in the chunk's left redzone, so maybe it is actually
-    // a right buffer overflow from the other chunk to the left.
-    // Search a bit to the left to see if there is another chunk.
-    AsanChunk *m2 = 0;
-    for (uptr l = 1; l < GetPageSizeCached(); l++) {
-      m2 = GetAsanChunkByAddr(addr - l);
-      if (m2 == m1) continue;  // Still the same chunk.
-      break;
-    }
-    if (m2 && AsanChunkView(m2).AddrIsAtRight(addr, 1, &offset))
-      m1 = ChooseChunk(addr, m2, m1);
-  }
-  return AsanChunkView(m1);
-}
-
-void AsanThreadLocalMallocStorage::CommitBack() {
-  AllocatorCache *ac = GetAllocatorCache(this);
-  quarantine.Drain(GetQuarantineCache(this), QuarantineCallback(ac));
-  allocator.SwallowCache(GetAllocatorCache(this));
-}
-
-void PrintInternalAllocatorStats() {
-  allocator.PrintStats();
-}
-
-void *asan_memalign(uptr alignment, uptr size, BufferedStackTrace *stack,
-                    AllocType alloc_type) {
-  return Allocate(size, alignment, stack, alloc_type, true);
-}
-
-void asan_free(void *ptr, BufferedStackTrace *stack, AllocType alloc_type) {
-  Deallocate(ptr, 0, stack, alloc_type);
-}
-
-void asan_sized_free(void *ptr, uptr size, BufferedStackTrace *stack,
-                     AllocType alloc_type) {
-  Deallocate(ptr, size, stack, alloc_type);
-}
-
-void *asan_malloc(uptr size, BufferedStackTrace *stack) {
-  return Allocate(size, 8, stack, FROM_MALLOC, true);
-}
-
-void *asan_calloc(uptr nmemb, uptr size, BufferedStackTrace *stack) {
-  if (CallocShouldReturnNullDueToOverflow(size, nmemb))
-    return AllocatorReturnNull();
-  void *ptr = Allocate(nmemb * size, 8, stack, FROM_MALLOC, false);
-  // If the memory comes from the secondary allocator no need to clear it
-  // as it comes directly from mmap.
-  if (ptr && allocator.FromPrimary(ptr))
-    REAL(memset)(ptr, 0, nmemb * size);
-  return ptr;
-}
-
-void *asan_realloc(void *p, uptr size, BufferedStackTrace *stack) {
-  if (p == 0)
-    return Allocate(size, 8, stack, FROM_MALLOC, true);
-  if (size == 0) {
-    Deallocate(p, 0, stack, FROM_MALLOC);
-    return 0;
-  }
-  return Reallocate(p, size, stack);
-}
-
-void *asan_valloc(uptr size, BufferedStackTrace *stack) {
-  return Allocate(size, GetPageSizeCached(), stack, FROM_MALLOC, true);
-}
-
-void *asan_pvalloc(uptr size, BufferedStackTrace *stack) {
-  uptr PageSize = GetPageSizeCached();
-  size = RoundUpTo(size, PageSize);
-  if (size == 0) {
-    // pvalloc(0) should allocate one page.
-    size = PageSize;
-  }
-  return Allocate(size, PageSize, stack, FROM_MALLOC, true);
-}
-
-int asan_posix_memalign(void **memptr, uptr alignment, uptr size,
-                        BufferedStackTrace *stack) {
-  void *ptr = Allocate(size, alignment, stack, FROM_MALLOC, true);
-  CHECK(IsAligned((uptr)ptr, alignment));
-  *memptr = ptr;
-  return 0;
-}
-
-uptr asan_malloc_usable_size(void *ptr, uptr pc, uptr bp) {
-  if (ptr == 0) return 0;
-  uptr usable_size = AllocationSize(reinterpret_cast<uptr>(ptr));
-  if (flags()->check_malloc_usable_size && (usable_size == 0)) {
-    GET_STACK_TRACE_FATAL(pc, bp);
-    ReportMallocUsableSizeNotOwned((uptr)ptr, &stack);
-  }
-  return usable_size;
-}
-
-uptr asan_mz_size(const void *ptr) {
-  return AllocationSize(reinterpret_cast<uptr>(ptr));
-}
-
-void asan_mz_force_lock() {
-  allocator.ForceLock();
-  fallback_mutex.Lock();
-}
-
-void asan_mz_force_unlock() {
-  fallback_mutex.Unlock();
-  allocator.ForceUnlock();
-}
-
-}  // namespace __asan
-
-// --- Implementation of LSan-specific functions --- {{{1
-namespace __lsan {
-void LockAllocator() {
-  __asan::allocator.ForceLock();
-}
-
-void UnlockAllocator() {
-  __asan::allocator.ForceUnlock();
-}
-
-void GetAllocatorGlobalRange(uptr *begin, uptr *end) {
-  *begin = (uptr)&__asan::allocator;
-  *end = *begin + sizeof(__asan::allocator);
-}
-
-uptr PointsIntoChunk(void* p) {
-  uptr addr = reinterpret_cast<uptr>(p);
-  __asan::AsanChunk *m = __asan::GetAsanChunkByAddrFastLocked(addr);
-  if (!m) return 0;
-  uptr chunk = m->Beg();
-  if (m->chunk_state != __asan::CHUNK_ALLOCATED)
-    return 0;
-  if (m->AddrIsInside(addr, /*locked_version=*/true))
-    return chunk;
-  if (IsSpecialCaseOfOperatorNew0(chunk, m->UsedSize(/*locked_version*/ true),
-                                  addr))
-    return chunk;
-  return 0;
-}
-
-uptr GetUserBegin(uptr chunk) {
-  __asan::AsanChunk *m =
-      __asan::GetAsanChunkByAddrFastLocked(chunk);
-  CHECK(m);
-  return m->Beg();
-}
-
-LsanMetadata::LsanMetadata(uptr chunk) {
-  metadata_ = reinterpret_cast<void *>(chunk - __asan::kChunkHeaderSize);
-}
-
-bool LsanMetadata::allocated() const {
-  __asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
-  return m->chunk_state == __asan::CHUNK_ALLOCATED;
-}
-
-ChunkTag LsanMetadata::tag() const {
-  __asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
-  return static_cast<ChunkTag>(m->lsan_tag);
-}
-
-void LsanMetadata::set_tag(ChunkTag value) {
-  __asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
-  m->lsan_tag = value;
-}
-
-uptr LsanMetadata::requested_size() const {
-  __asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
-  return m->UsedSize(/*locked_version=*/true);
-}
-
-u32 LsanMetadata::stack_trace_id() const {
-  __asan::AsanChunk *m = reinterpret_cast<__asan::AsanChunk *>(metadata_);
-  return m->alloc_context_id;
-}
-
-void ForEachChunk(ForEachChunkCallback callback, void *arg) {
-  __asan::allocator.ForEachChunk(callback, arg);
-}
-
-IgnoreObjectResult IgnoreObjectLocked(const void *p) {
-  uptr addr = reinterpret_cast<uptr>(p);
-  __asan::AsanChunk *m = __asan::GetAsanChunkByAddr(addr);
-  if (!m) return kIgnoreObjectInvalid;
-  if ((m->chunk_state == __asan::CHUNK_ALLOCATED) && m->AddrIsInside(addr)) {
-    if (m->lsan_tag == kIgnored)
-      return kIgnoreObjectAlreadyIgnored;
-    m->lsan_tag = __lsan::kIgnored;
-    return kIgnoreObjectSuccess;
-  } else {
-    return kIgnoreObjectInvalid;
-  }
-}
-}  // namespace __lsan
-
-// ---------------------- Interface ---------------- {{{1
-using namespace __asan;  // NOLINT
-
-// ASan allocator doesn't reserve extra bytes, so normally we would
-// just return "size". We don't want to expose our redzone sizes, etc here.
-uptr __sanitizer_get_estimated_allocated_size(uptr size) {
-  return size;
-}
-
-int __sanitizer_get_ownership(const void *p) {
-  uptr ptr = reinterpret_cast<uptr>(p);
-  return (AllocationSize(ptr) > 0);
-}
-
-uptr __sanitizer_get_allocated_size(const void *p) {
-  if (p == 0) return 0;
-  uptr ptr = reinterpret_cast<uptr>(p);
-  uptr allocated_size = AllocationSize(ptr);
-  // Die if p is not malloced or if it is already freed.
-  if (allocated_size == 0) {
-    GET_STACK_TRACE_FATAL_HERE;
-    ReportSanitizerGetAllocatedSizeNotOwned(ptr, &stack);
-  }
-  return allocated_size;
-}
-
-#if !SANITIZER_SUPPORTS_WEAK_HOOKS
-// Provide default (no-op) implementation of malloc hooks.
-extern "C" {
-SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
-void __sanitizer_malloc_hook(void *ptr, uptr size) {
-  (void)ptr;
-  (void)size;
-}
-SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
-void __sanitizer_free_hook(void *ptr) {
-  (void)ptr;
-}
-}  // extern "C"
-#endif
diff --git a/contrib/compiler-rt/lib/asan/asan_debugging.cc b/contrib/compiler-rt/lib/asan/asan_debugging.cc
index 2b66dd5265fc..6fc5b690de99 100644
--- a/contrib/compiler-rt/lib/asan/asan_debugging.cc
+++ b/contrib/compiler-rt/lib/asan/asan_debugging.cc
@@ -81,8 +81,8 @@ void AsanLocateAddress(uptr addr, AddressDescription *descr) {
   GetInfoForHeapAddress(addr, descr);
 }
 
-uptr AsanGetStack(uptr addr, uptr *trace, uptr size, u32 *thread_id,
-                  bool alloc_stack) {
+static uptr AsanGetStack(uptr addr, uptr *trace, u32 size, u32 *thread_id,
+                         bool alloc_stack) {
   AsanChunkView chunk = FindHeapChunkByAddress(addr);
   if (!chunk.IsValid()) return 0;
 
diff --git a/contrib/compiler-rt/lib/asan/asan_fake_stack.cc b/contrib/compiler-rt/lib/asan/asan_fake_stack.cc
index c95bc11f6cd3..bf4f1eb4c781 100644
--- a/contrib/compiler-rt/lib/asan/asan_fake_stack.cc
+++ b/contrib/compiler-rt/lib/asan/asan_fake_stack.cc
@@ -60,7 +60,7 @@ FakeStack *FakeStack::Create(uptr stack_size_log) {
 
 void FakeStack::Destroy(int tid) {
   PoisonAll(0);
-  if (common_flags()->verbosity >= 2) {
+  if (Verbosity() >= 2) {
     InternalScopedString str(kNumberOfSizeClasses * 50);
     for (uptr class_id = 0; class_id < kNumberOfSizeClasses; class_id++)
       str.append("%zd: %zd/%zd; ", class_id, hint_position_[class_id],
@@ -192,20 +192,19 @@ static FakeStack *GetFakeStackFast() {
   return GetFakeStack();
 }
 
-ALWAYS_INLINE uptr OnMalloc(uptr class_id, uptr size, uptr real_stack) {
+ALWAYS_INLINE uptr OnMalloc(uptr class_id, uptr size) {
   FakeStack *fs = GetFakeStackFast();
-  if (!fs) return real_stack;
+  if (!fs) return 0;
+  uptr local_stack;
+  uptr real_stack = reinterpret_cast<uptr>(&local_stack);
   FakeFrame *ff = fs->Allocate(fs->stack_size_log(), class_id, real_stack);
-  if (!ff)
-    return real_stack;  // Out of fake stack, return the real one.
+  if (!ff) return 0;  // Out of fake stack.
   uptr ptr = reinterpret_cast<uptr>(ff);
   SetShadow(ptr, size, class_id, 0);
   return ptr;
 }
 
-ALWAYS_INLINE void OnFree(uptr ptr, uptr class_id, uptr size, uptr real_stack) {
-  if (ptr == real_stack)
-    return;
+ALWAYS_INLINE void OnFree(uptr ptr, uptr class_id, uptr size) {
   FakeStack::Deallocate(ptr, class_id);
   SetShadow(ptr, size, class_id, kMagic8);
 }
@@ -216,12 +215,12 @@ ALWAYS_INLINE void OnFree(uptr ptr, uptr class_id, uptr size, uptr real_stack) {
 using namespace __asan;
 #define DEFINE_STACK_MALLOC_FREE_WITH_CLASS_ID(class_id)                       \
   extern "C" SANITIZER_INTERFACE_ATTRIBUTE uptr                                \
-  __asan_stack_malloc_##class_id(uptr size, uptr real_stack) {                 \
-    return OnMalloc(class_id, size, real_stack);                               \
+      __asan_stack_malloc_##class_id(uptr size) {                              \
+    return OnMalloc(class_id, size);                                           \
   }                                                                            \
   extern "C" SANITIZER_INTERFACE_ATTRIBUTE void __asan_stack_free_##class_id(  \
-      uptr ptr, uptr size, uptr real_stack) {                                  \
-    OnFree(ptr, class_id, size, real_stack);                                   \
+      uptr ptr, uptr size) {                                                   \
+    OnFree(ptr, class_id, size);                                               \
   }
 
 DEFINE_STACK_MALLOC_FREE_WITH_CLASS_ID(0)
diff --git a/contrib/compiler-rt/lib/asan/asan_flags.cc b/contrib/compiler-rt/lib/asan/asan_flags.cc
new file mode 100644
index 000000000000..1d82ab0e725f
--- /dev/null
+++ b/contrib/compiler-rt/lib/asan/asan_flags.cc
@@ -0,0 +1,141 @@
+//===-- asan_flags.cc -------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// ASan flag parsing logic.
+//===----------------------------------------------------------------------===//
+
+#include "asan_activation.h"
+#include "asan_flags.h"
+#include "asan_interface_internal.h"
+#include "asan_stack.h"
+#include "lsan/lsan_common.h"
+#include "sanitizer_common/sanitizer_common.h"
+#include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_flag_parser.h"
+
+namespace __asan {
+
+Flags asan_flags_dont_use_directly;  // use via flags().
+
+static const char *MaybeCallAsanDefaultOptions() {
+  return (&__asan_default_options) ? __asan_default_options() : "";
+}
+
+static const char *MaybeUseAsanDefaultOptionsCompileDefinition() {
+#ifdef ASAN_DEFAULT_OPTIONS
+// Stringize the macro value.
+# define ASAN_STRINGIZE(x) #x
+# define ASAN_STRINGIZE_OPTIONS(options) ASAN_STRINGIZE(options)
+  return ASAN_STRINGIZE_OPTIONS(ASAN_DEFAULT_OPTIONS);
+#else
+  return "";
+#endif
+}
+
+void Flags::SetDefaults() {
+#define ASAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
+#include "asan_flags.inc"
+#undef ASAN_FLAG
+}
+
+void RegisterAsanFlags(FlagParser *parser, Flags *f) {
+#define ASAN_FLAG(Type, Name, DefaultValue, Description) \
+  RegisterFlag(parser, #Name, Description, &f->Name);
+#include "asan_flags.inc"
+#undef ASAN_FLAG
+}
+
+void InitializeFlags(Flags *f) {
+  FlagParser parser;
+  RegisterAsanFlags(&parser, f);
+  RegisterCommonFlags(&parser);
+
+  SetCommonFlagsDefaults();
+  {
+    CommonFlags cf;
+    cf.CopyFrom(*common_flags());
+    cf.detect_leaks = CAN_SANITIZE_LEAKS;
+    cf.external_symbolizer_path = GetEnv("ASAN_SYMBOLIZER_PATH");
+    cf.malloc_context_size = kDefaultMallocContextSize;
+    cf.intercept_tls_get_addr = true;
+    OverrideCommonFlags(cf);
+  }
+
+  const int kDefaultQuarantineSizeMb = (ASAN_LOW_MEMORY) ? 1UL << 6 : 1UL << 8;
+  f->SetDefaults();
+
+  // Override from compile definition.
+  const char *compile_def = MaybeUseAsanDefaultOptionsCompileDefinition();
+  parser.ParseString(compile_def);
+
+  // Override from user-specified string.
+  const char *default_options = MaybeCallAsanDefaultOptions();
+  parser.ParseString(default_options);
+
+  // Override from command line.
+  const char *env = GetEnv("ASAN_OPTIONS");
+  if (env) parser.ParseString(env);
+
+  // Let activation flags override current settings. On Android they come
+  // from a system property. On other platforms this is no-op.
+  if (!flags()->start_deactivated) {
+    char buf[100];
+    GetExtraActivationFlags(buf, sizeof(buf));
+    parser.ParseString(buf);
+  }
+
+  SetVerbosity(common_flags()->verbosity);
+
+  // TODO(eugenis): dump all flags at verbosity>=2?
+  if (Verbosity()) ReportUnrecognizedFlags();
+
+  if (common_flags()->help) parser.PrintFlagDescriptions();
+
+  // Flag validation:
+  if (!CAN_SANITIZE_LEAKS && common_flags()->detect_leaks) {
+    Report("%s: detect_leaks is not supported on this platform.\n",
+           SanitizerToolName);
+    Die();
+  }
+  // Make "strict_init_order" imply "check_initialization_order".
+  // TODO(samsonov): Use a single runtime flag for an init-order checker.
+  if (f->strict_init_order) {
+    f->check_initialization_order = true;
+  }
+  CHECK_LE((uptr)common_flags()->malloc_context_size, kStackTraceMax);
+  CHECK_LE(f->min_uar_stack_size_log, f->max_uar_stack_size_log);
+  CHECK_GE(f->redzone, 16);
+  CHECK_GE(f->max_redzone, f->redzone);
+  CHECK_LE(f->max_redzone, 2048);
+  CHECK(IsPowerOfTwo(f->redzone));
+  CHECK(IsPowerOfTwo(f->max_redzone));
+
+  // quarantine_size is deprecated but we still honor it.
+  // quarantine_size can not be used together with quarantine_size_mb.
+  if (f->quarantine_size >= 0 && f->quarantine_size_mb >= 0) {
+    Report("%s: please use either 'quarantine_size' (deprecated) or "
+           "quarantine_size_mb, but not both\n", SanitizerToolName);
+    Die();
+  }
+  if (f->quarantine_size >= 0)
+    f->quarantine_size_mb = f->quarantine_size >> 20;
+  if (f->quarantine_size_mb < 0)
+    f->quarantine_size_mb = kDefaultQuarantineSizeMb;
+}
+
+}  // namespace __asan
+
+#if !SANITIZER_SUPPORTS_WEAK_HOOKS
+extern "C" {
+SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
+const char* __asan_default_options() { return ""; }
+}  // extern "C"
+#endif
diff --git a/contrib/compiler-rt/lib/asan/asan_flags.h b/contrib/compiler-rt/lib/asan/asan_flags.h
index 3df4dd3050bc..7653543f6d88 100644
--- a/contrib/compiler-rt/lib/asan/asan_flags.h
+++ b/contrib/compiler-rt/lib/asan/asan_flags.h
@@ -16,6 +16,7 @@
 #define ASAN_FLAGS_H
 
 #include "sanitizer_common/sanitizer_internal_defs.h"
+#include "sanitizer_common/sanitizer_flag_parser.h"
 
 // ASan flag values can be defined in four ways:
 // 1) initialized with default values at startup.
@@ -24,55 +25,24 @@
 // 3) overriden from string returned by user-specified function
 //    __asan_default_options().
 // 4) overriden from env variable ASAN_OPTIONS.
+// 5) overriden during ASan activation (for now used on Android only).
 
 namespace __asan {
 
 struct Flags {
-  // Flag descriptions are in asan_rtl.cc.
-  int  quarantine_size;
-  int  redzone;
-  int  max_redzone;
-  bool debug;
-  int  report_globals;
-  bool check_initialization_order;
-  bool replace_str;
-  bool replace_intrin;
-  bool mac_ignore_invalid_free;
-  bool detect_stack_use_after_return;
-  int min_uar_stack_size_log;
-  int max_uar_stack_size_log;
-  bool uar_noreserve;
-  int max_malloc_fill_size, malloc_fill_byte;
-  int  exitcode;
-  bool allow_user_poisoning;
-  int  sleep_before_dying;
-  bool check_malloc_usable_size;
-  bool unmap_shadow_on_exit;
-  bool abort_on_error;
-  bool print_stats;
-  bool print_legend;
-  bool atexit;
-  bool allow_reexec;
-  bool print_full_thread_history;
-  bool poison_heap;
-  bool poison_partial;
-  bool poison_array_cookie;
-  bool alloc_dealloc_mismatch;
-  bool new_delete_type_mismatch;
-  bool strict_memcmp;
-  bool strict_init_order;
-  bool start_deactivated;
-  int detect_invalid_pointer_pairs;
-  bool detect_container_overflow;
-  int detect_odr_violation;
-  bool dump_instruction_bytes;
+#define ASAN_FLAG(Type, Name, DefaultValue, Description) Type Name;
+#include "asan_flags.inc"
+#undef ASAN_FLAG
+
+  void SetDefaults();
 };
 
 extern Flags asan_flags_dont_use_directly;
 inline Flags *flags() {
   return &asan_flags_dont_use_directly;
 }
-void InitializeFlags(Flags *f, const char *env);
+void RegisterAsanFlags(FlagParser *parser, Flags *f);
+void InitializeFlags(Flags *f);
 
 }  // namespace __asan
 
diff --git a/contrib/compiler-rt/lib/asan/asan_flags.inc b/contrib/compiler-rt/lib/asan/asan_flags.inc
new file mode 100644
index 000000000000..ec9d41980d9c
--- /dev/null
+++ b/contrib/compiler-rt/lib/asan/asan_flags.inc
@@ -0,0 +1,144 @@
+//===-- asan_flags.inc ------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// ASan runtime flags.
+//
+//===----------------------------------------------------------------------===//
+#ifndef ASAN_FLAG
+# error "Define ASAN_FLAG prior to including this file!"
+#endif
+
+// ASAN_FLAG(Type, Name, DefaultValue, Description)
+// See COMMON_FLAG in sanitizer_flags.inc for more details.
+
+ASAN_FLAG(int, quarantine_size, -1,
+            "Deprecated, please use quarantine_size_mb.")
+ASAN_FLAG(int, quarantine_size_mb, -1,
+          "Size (in Mb) of quarantine used to detect use-after-free "
+          "errors. Lower value may reduce memory usage but increase the "
+          "chance of false negatives.")
+ASAN_FLAG(int, redzone, 16,
+          "Minimal size (in bytes) of redzones around heap objects. "
+          "Requirement: redzone >= 16, is a power of two.")
+ASAN_FLAG(int, max_redzone, 2048,
+          "Maximal size (in bytes) of redzones around heap objects.")
+ASAN_FLAG(
+    bool, debug, false,
+    "If set, prints some debugging information and does additional checks.")
+ASAN_FLAG(
+    int, report_globals, 1,
+    "Controls the way to handle globals (0 - don't detect buffer overflow on "
+    "globals, 1 - detect buffer overflow, 2 - print data about registered "
+    "globals).")
+ASAN_FLAG(bool, check_initialization_order, false,
+          "If set, attempts to catch initialization order issues.")
+ASAN_FLAG(
+    bool, replace_str, true,
+    "If set, uses custom wrappers and replacements for libc string functions "
+    "to find more errors.")
+ASAN_FLAG(bool, replace_intrin, true,
+          "If set, uses custom wrappers for memset/memcpy/memmove intinsics.")
+ASAN_FLAG(bool, mac_ignore_invalid_free, false,
+          "Ignore invalid free() calls to work around some bugs. Used on OS X "
+          "only.")
+ASAN_FLAG(bool, detect_stack_use_after_return, false,
+          "Enables stack-use-after-return checking at run-time.")
+ASAN_FLAG(int, min_uar_stack_size_log, 16, // We can't do smaller anyway.
+          "Minimum fake stack size log.")
+ASAN_FLAG(int, max_uar_stack_size_log,
+          20, // 1Mb per size class, i.e. ~11Mb per thread
+          "Maximum fake stack size log.")
+ASAN_FLAG(bool, uar_noreserve, false,
+          "Use mmap with 'noreserve' flag to allocate fake stack.")
+ASAN_FLAG(
+    int, max_malloc_fill_size, 0x1000,  // By default, fill only the first 4K.
+    "ASan allocator flag. max_malloc_fill_size is the maximal amount of "
+    "bytes that will be filled with malloc_fill_byte on malloc.")
+ASAN_FLAG(int, malloc_fill_byte, 0xbe,
+          "Value used to fill the newly allocated memory.")
+ASAN_FLAG(int, exitcode, ASAN_DEFAULT_FAILURE_EXITCODE,
+          "Override the program exit status if the tool found an error.")
+ASAN_FLAG(bool, allow_user_poisoning, true,
+          "If set, user may manually mark memory regions as poisoned or "
+          "unpoisoned.")
+ASAN_FLAG(
+    int, sleep_before_dying, 0,
+    "Number of seconds to sleep between printing an error report and "
+    "terminating the program. Useful for debugging purposes (e.g. when one "
+    "needs to attach gdb).")
+ASAN_FLAG(bool, check_malloc_usable_size, true,
+          "Allows the users to work around the bug in Nvidia drivers prior to "
+          "295.*.")
+ASAN_FLAG(bool, unmap_shadow_on_exit, false,
+          "If set, explicitly unmaps the (huge) shadow at exit.")
+ASAN_FLAG(
+    bool, abort_on_error, false,
+    "If set, the tool calls abort() instead of _exit() after printing the "
+    "error report.")
+ASAN_FLAG(bool, print_stats, false,
+          "Print various statistics after printing an error message or if "
+          "atexit=1.")
+ASAN_FLAG(bool, print_legend, true, "Print the legend for the shadow bytes.")
+ASAN_FLAG(bool, atexit, false,
+          "If set, prints ASan exit stats even after program terminates "
+          "successfully.")
+ASAN_FLAG(
+    bool, print_full_thread_history, true,
+    "If set, prints thread creation stacks for the threads involved in the "
+    "report and their ancestors up to the main thread.")
+ASAN_FLAG(
+    bool, poison_heap, true,
+    "Poison (or not) the heap memory on [de]allocation. Zero value is useful "
+    "for benchmarking the allocator or instrumentator.")
+ASAN_FLAG(bool, poison_partial, true,
+          "If true, poison partially addressable 8-byte aligned words "
+          "(default=true). This flag affects heap and global buffers, but not "
+          "stack buffers.")
+ASAN_FLAG(bool, poison_array_cookie, true,
+          "Poison (or not) the array cookie after operator new[].")
+
+// Turn off alloc/dealloc mismatch checker on Mac and Windows for now.
+// https://code.google.com/p/address-sanitizer/issues/detail?id=131
+// https://code.google.com/p/address-sanitizer/issues/detail?id=309
+// TODO(glider,timurrrr): Fix known issues and enable this back.
+ASAN_FLAG(bool, alloc_dealloc_mismatch,
+          (SANITIZER_MAC == 0) && (SANITIZER_WINDOWS == 0),
+          "Report errors on malloc/delete, new/free, new/delete[], etc.")
+
+ASAN_FLAG(bool, new_delete_type_mismatch, true,
+          "Report errors on mismatch betwen size of new and delete.")
+ASAN_FLAG(bool, strict_memcmp, true,
+          "If true, assume that memcmp(p1, p2, n) always reads n bytes before "
+          "comparing p1 and p2.")
+ASAN_FLAG(
+    bool, strict_init_order, false,
+    "If true, assume that dynamic initializers can never access globals from "
+    "other modules, even if the latter are already initialized.")
+ASAN_FLAG(
+    bool, start_deactivated, false,
+    "If true, ASan tweaks a bunch of other flags (quarantine, redzone, heap "
+    "poisoning) to reduce memory consumption as much as possible, and "
+    "restores them to original values when the first instrumented module is "
+    "loaded into the process. This is mainly intended to be used on "
+    "Android. ")
+ASAN_FLAG(
+    int, detect_invalid_pointer_pairs, 0,
+    "If non-zero, try to detect operations like <, <=, >, >= and - on "
+    "invalid pointer pairs (e.g. when pointers belong to different objects). "
+    "The bigger the value the harder we try.")
+ASAN_FLAG(
+    bool, detect_container_overflow, true,
+    "If true, honor the container overflow  annotations. "
+    "See https://code.google.com/p/address-sanitizer/wiki/ContainerOverflow")
+ASAN_FLAG(int, detect_odr_violation, 2,
+          "If >=2, detect violation of One-Definition-Rule (ODR); "
+          "If ==1, detect ODR-violation only if the two variables "
+          "have different sizes")
+ASAN_FLAG(bool, dump_instruction_bytes, false,
+          "If true, dump 16 bytes starting at the instruction that caused SEGV")
diff --git a/contrib/compiler-rt/lib/asan/asan_globals.cc b/contrib/compiler-rt/lib/asan/asan_globals.cc
index be111d4fb4cf..c4571953c408 100644
--- a/contrib/compiler-rt/lib/asan/asan_globals.cc
+++ b/contrib/compiler-rt/lib/asan/asan_globals.cc
@@ -164,7 +164,7 @@ static void RegisterGlobal(const Global *g) {
       }
     }
   }
-  if (flags()->poison_heap)
+  if (CanPoisonMemory())
     PoisonRedZones(*g);
   ListOfGlobals *l = new(allocator_for_globals) ListOfGlobals;
   l->g = g;
@@ -186,7 +186,7 @@ static void UnregisterGlobal(const Global *g) {
   CHECK(AddrIsInMem(g->beg));
   CHECK(AddrIsAlignedByGranularity(g->beg));
   CHECK(AddrIsAlignedByGranularity(g->size_with_redzone));
-  if (flags()->poison_heap)
+  if (CanPoisonMemory())
     PoisonShadowForGlobal(g, 0);
   // We unpoison the shadow memory for the global but we do not remove it from
   // the list because that would require O(n^2) time with the current list
@@ -249,7 +249,7 @@ void __asan_unregister_globals(__asan_global *globals, uptr n) {
 // initializer can only touch global variables in the same TU.
 void __asan_before_dynamic_init(const char *module_name) {
   if (!flags()->check_initialization_order ||
-      !flags()->poison_heap)
+      !CanPoisonMemory())
     return;
   bool strict_init_order = flags()->strict_init_order;
   CHECK(dynamic_init_globals);
@@ -275,7 +275,7 @@ void __asan_before_dynamic_init(const char *module_name) {
 // TU are poisoned.  It simply unpoisons all dynamically initialized globals.
 void __asan_after_dynamic_init() {
   if (!flags()->check_initialization_order ||
-      !flags()->poison_heap)
+      !CanPoisonMemory())
     return;
   CHECK(asan_inited);
   BlockingMutexLock lock(&mu_for_globals);
diff --git a/contrib/compiler-rt/lib/asan/asan_init_version.h b/contrib/compiler-rt/lib/asan/asan_init_version.h
index 77aea81bd298..6cf57c4aa2a8 100644
--- a/contrib/compiler-rt/lib/asan/asan_init_version.h
+++ b/contrib/compiler-rt/lib/asan/asan_init_version.h
@@ -25,8 +25,10 @@ extern "C" {
   //         contains the function PC as the 3-rd field (see
   //         DescribeAddressIfStack).
   // v3=>v4: added '__asan_global_source_location' to __asan_global.
-  #define __asan_init __asan_init_v4
-  #define __asan_init_name "__asan_init_v4"
+  // v4=>v5: changed the semantics and format of __asan_stack_malloc_ and
+  //         __asan_stack_free_ functions.
+  #define __asan_init __asan_init_v5
+  #define __asan_init_name "__asan_init_v5"
 }
 
 #endif  // ASAN_INIT_VERSION_H
diff --git a/contrib/compiler-rt/lib/asan/asan_interceptors.cc b/contrib/compiler-rt/lib/asan/asan_interceptors.cc
index 910cd3addcb0..3dc7ec67a3e5 100644
--- a/contrib/compiler-rt/lib/asan/asan_interceptors.cc
+++ b/contrib/compiler-rt/lib/asan/asan_interceptors.cc
@@ -142,14 +142,17 @@ DECLARE_REAL_AND_INTERCEPTOR(void, free, void *)
 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size) \
   ASAN_READ_RANGE(ctx, ptr, size)
 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...)                               \
+  ASAN_INTERCEPTOR_ENTER(ctx, func);                                           \
   do {                                                                         \
     if (asan_init_is_running)                                                  \
       return REAL(func)(__VA_ARGS__);                                          \
-    ASAN_INTERCEPTOR_ENTER(ctx, func);                                         \
     if (SANITIZER_MAC && UNLIKELY(!asan_inited))                               \
       return REAL(func)(__VA_ARGS__);                                          \
     ENSURE_ASAN_INITED();                                                      \
   } while (false)
+#define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
+  do {                                            \
+  } while (false)
 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
   do {                                         \
   } while (false)
@@ -169,8 +172,9 @@ DECLARE_REAL_AND_INTERCEPTOR(void, free, void *)
   } while (false)
 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name)
 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit()
-#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, res) CovUpdateMapping()
-#define COMMON_INTERCEPTOR_LIBRARY_UNLOADED() CovUpdateMapping()
+#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
+  CoverageUpdateMapping()
+#define COMMON_INTERCEPTOR_LIBRARY_UNLOADED() CoverageUpdateMapping()
 #define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED (!asan_inited)
 #include "sanitizer_common/sanitizer_common_interceptors.inc"
 
@@ -196,6 +200,12 @@ struct ThreadStartParam {
 };
 
 static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) {
+#if SANITIZER_WINDOWS
+  // FIXME: this is a bandaid fix for PR22025.
+  AsanThread *t = (AsanThread*)arg;
+  SetCurrentThread(t);
+  return t->ThreadStart(GetTid(), /* signal_thread_is_registered */ nullptr);
+#else
   ThreadStartParam *param = reinterpret_cast<ThreadStartParam *>(arg);
   AsanThread *t = nullptr;
   while ((t = reinterpret_cast<AsanThread *>(
@@ -203,6 +213,7 @@ static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) {
     internal_sched_yield();
   SetCurrentThread(t);
   return t->ThreadStart(GetTid(), &param->is_registered);
+#endif
 }
 
 #if ASAN_INTERCEPT_PTHREAD_CREATE
@@ -236,22 +247,26 @@ INTERCEPTOR(int, pthread_create, void *thread,
   }
   return result;
 }
+
+INTERCEPTOR(int, pthread_join, void *t, void **arg) {
+  return real_pthread_join(t, arg);
+}
+
+DEFINE_REAL_PTHREAD_FUNCTIONS
 #endif  // ASAN_INTERCEPT_PTHREAD_CREATE
 
 #if ASAN_INTERCEPT_SIGNAL_AND_SIGACTION
 
 #if SANITIZER_ANDROID
 INTERCEPTOR(void*, bsd_signal, int signum, void *handler) {
-  if (!AsanInterceptsSignal(signum) ||
-      common_flags()->allow_user_segv_handler) {
+  if (!IsDeadlySignal(signum) || common_flags()->allow_user_segv_handler) {
     return REAL(bsd_signal)(signum, handler);
   }
   return 0;
 }
 #else
 INTERCEPTOR(void*, signal, int signum, void *handler) {
-  if (!AsanInterceptsSignal(signum) ||
-      common_flags()->allow_user_segv_handler) {
+  if (!IsDeadlySignal(signum) || common_flags()->allow_user_segv_handler) {
     return REAL(signal)(signum, handler);
   }
   return 0;
@@ -260,8 +275,7 @@ INTERCEPTOR(void*, signal, int signum, void *handler) {
 
 INTERCEPTOR(int, sigaction, int signum, const struct sigaction *act,
                             struct sigaction *oldact) {
-  if (!AsanInterceptsSignal(signum) ||
-      common_flags()->allow_user_segv_handler) {
+  if (!IsDeadlySignal(signum) || common_flags()->allow_user_segv_handler) {
     return REAL(sigaction)(signum, act, oldact);
   }
   return 0;
@@ -802,23 +816,14 @@ INTERCEPTOR_WINAPI(DWORD, CreateThread,
   if (flags()->strict_init_order)
     StopInitOrderChecking();
   GET_STACK_TRACE_THREAD;
+  // FIXME: The CreateThread interceptor is not the same as a pthread_create
+  // one.  This is a bandaid fix for PR22025.
   bool detached = false;  // FIXME: how can we determine it on Windows?
-  ThreadStartParam param;
-  atomic_store(&param.t, 0, memory_order_relaxed);
-  atomic_store(&param.is_registered, 0, memory_order_relaxed);
-  DWORD result = REAL(CreateThread)(security, stack_size, asan_thread_start,
-                                    &param, thr_flags, tid);
-  if (result) {
-    u32 current_tid = GetCurrentTidOrInvalid();
-    AsanThread *t =
+  u32 current_tid = GetCurrentTidOrInvalid();
+  AsanThread *t =
         AsanThread::Create(start_routine, arg, current_tid, &stack, detached);
-    atomic_store(&param.t, reinterpret_cast<uptr>(t), memory_order_release);
-    // The pthread_create interceptor waits here, so we do the same for
-    // consistency.
-    while (atomic_load(&param.is_registered, memory_order_acquire) == 0)
-      internal_sched_yield();
-  }
-  return result;
+  return REAL(CreateThread)(security, stack_size,
+                            asan_thread_start, t, thr_flags, tid);
 }
 
 namespace __asan {
@@ -902,6 +907,7 @@ void InitializeAsanInterceptors() {
   // Intercept threading-related functions
 #if ASAN_INTERCEPT_PTHREAD_CREATE
   ASAN_INTERCEPT_FUNC(pthread_create);
+  ASAN_INTERCEPT_FUNC(pthread_join);
 #endif
 
   // Intercept atexit function.
diff --git a/contrib/compiler-rt/lib/asan/asan_internal.h b/contrib/compiler-rt/lib/asan/asan_internal.h
index 65d4a47d3d9e..a8e23ce772ff 100644
--- a/contrib/compiler-rt/lib/asan/asan_internal.h
+++ b/contrib/compiler-rt/lib/asan/asan_internal.h
@@ -94,7 +94,6 @@ void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp);
 void AsanOnSIGSEGV(int, void *siginfo, void *context);
 
 void MaybeReexec();
-bool AsanInterceptsSignal(int signum);
 void ReadContextStack(void *context, uptr *stack, uptr *ssize);
 void AsanPlatformThreadInit();
 void StopInitOrderChecking();
@@ -107,10 +106,10 @@ void PlatformTSDDtor(void *tsd);
 
 void AppendToErrorMessageBuffer(const char *buffer);
 
-void ParseExtraActivationFlags();
-
 void *AsanDlSymNext(const char *sym);
 
+void ReserveShadowMemoryRange(uptr beg, uptr end);
+
 // Platform-specific options.
 #if SANITIZER_MAC
 bool PlatformHasDifferentMemcpyAndMemmove();
diff --git a/contrib/compiler-rt/lib/asan/asan_linux.cc b/contrib/compiler-rt/lib/asan/asan_linux.cc
index fdd009c960d8..65605009005f 100644
--- a/contrib/compiler-rt/lib/asan/asan_linux.cc
+++ b/contrib/compiler-rt/lib/asan/asan_linux.cc
@@ -220,10 +220,6 @@ void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
 #endif
 }
 
-bool AsanInterceptsSignal(int signum) {
-  return signum == SIGSEGV && common_flags()->handle_segv;
-}
-
 void AsanPlatformThreadInit() {
   // Nothing here for now.
 }
diff --git a/contrib/compiler-rt/lib/asan/asan_mac.cc b/contrib/compiler-rt/lib/asan/asan_mac.cc
index ae0fa15b6523..5c2caeae4934 100644
--- a/contrib/compiler-rt/lib/asan/asan_mac.cc
+++ b/contrib/compiler-rt/lib/asan/asan_mac.cc
@@ -102,7 +102,6 @@ void LeakyResetEnv(const char *name, const char *name_value) {
 }
 
 void MaybeReexec() {
-  if (!flags()->allow_reexec) return;
   // Make sure the dynamic ASan runtime library is preloaded so that the
   // wrappers work. If it is not, set DYLD_INSERT_LIBRARIES and re-exec
   // ourselves.
@@ -113,8 +112,10 @@ void MaybeReexec() {
   uptr old_env_len = dyld_insert_libraries ?
       internal_strlen(dyld_insert_libraries) : 0;
   uptr fname_len = internal_strlen(info.dli_fname);
+  const char *dylib_name = StripModuleName(info.dli_fname);
+  uptr dylib_name_len = internal_strlen(dylib_name);
   if (!dyld_insert_libraries ||
-      !REAL(strstr)(dyld_insert_libraries, StripModuleName(info.dli_fname))) {
+      !REAL(strstr)(dyld_insert_libraries, dylib_name)) {
     // DYLD_INSERT_LIBRARIES is not set or does not contain the runtime
     // library.
     char program_name[1024];
@@ -140,58 +141,74 @@ void MaybeReexec() {
     VReport(1, "exec()-ing the program with\n");
     VReport(1, "%s=%s\n", kDyldInsertLibraries, new_env);
     VReport(1, "to enable ASan wrappers.\n");
-    VReport(1, "Set ASAN_OPTIONS=allow_reexec=0 to disable this.\n");
     execv(program_name, *_NSGetArgv());
-  } else {
-    // DYLD_INSERT_LIBRARIES is set and contains the runtime library.
-    if (old_env_len == fname_len) {
-      // It's just the runtime library name - fine to unset the variable.
-      LeakyResetEnv(kDyldInsertLibraries, NULL);
+
+    // We get here only if execv() failed.
+    Report("ERROR: The process is launched without DYLD_INSERT_LIBRARIES, "
+           "which is required for ASan to work. ASan tried to set the "
+           "environment variable and re-execute itself, but execv() failed, "
+           "possibly because of sandbox restrictions. Make sure to launch the "
+           "executable with:\n%s=%s\n", kDyldInsertLibraries, new_env);
+    CHECK("execv failed" && 0);
+  }
+
+  // DYLD_INSERT_LIBRARIES is set and contains the runtime library. Let's remove
+  // the dylib from the environment variable, because interceptors are installed
+  // and we don't want our children to inherit the variable.
+
+  uptr env_name_len = internal_strlen(kDyldInsertLibraries);
+  // Allocate memory to hold the previous env var name, its value, the '='
+  // sign and the '\0' char.
+  char *new_env = (char*)allocator_for_env.Allocate(
+      old_env_len + 2 + env_name_len);
+  CHECK(new_env);
+  internal_memset(new_env, '\0', old_env_len + 2 + env_name_len);
+  internal_strncpy(new_env, kDyldInsertLibraries, env_name_len);
+  new_env[env_name_len] = '=';
+  char *new_env_pos = new_env + env_name_len + 1;
+
+  // Iterate over colon-separated pieces of |dyld_insert_libraries|.
+  char *piece_start = dyld_insert_libraries;
+  char *piece_end = NULL;
+  char *old_env_end = dyld_insert_libraries + old_env_len;
+  do {
+    if (piece_start[0] == ':') piece_start++;
+    piece_end = REAL(strchr)(piece_start, ':');
+    if (!piece_end) piece_end = dyld_insert_libraries + old_env_len;
+    if ((uptr)(piece_start - dyld_insert_libraries) > old_env_len) break;
+    uptr piece_len = piece_end - piece_start;
+
+    char *filename_start =
+        (char *)internal_memrchr(piece_start, '/', piece_len);
+    uptr filename_len = piece_len;
+    if (filename_start) {
+      filename_start += 1;
+      filename_len = piece_len - (filename_start - piece_start);
     } else {
-      uptr env_name_len = internal_strlen(kDyldInsertLibraries);
-      // Allocate memory to hold the previous env var name, its value, the '='
-      // sign and the '\0' char.
-      char *new_env = (char*)allocator_for_env.Allocate(
-          old_env_len + 2 + env_name_len);
-      CHECK(new_env);
-      internal_memset(new_env, '\0', old_env_len + 2 + env_name_len);
-      internal_strncpy(new_env, kDyldInsertLibraries, env_name_len);
-      new_env[env_name_len] = '=';
-      char *new_env_pos = new_env + env_name_len + 1;
-
-      // Iterate over colon-separated pieces of |dyld_insert_libraries|.
-      char *piece_start = dyld_insert_libraries;
-      char *piece_end = NULL;
-      char *old_env_end = dyld_insert_libraries + old_env_len;
-      do {
-        if (piece_start[0] == ':') piece_start++;
-        piece_end =  REAL(strchr)(piece_start, ':');
-        if (!piece_end) piece_end = dyld_insert_libraries + old_env_len;
-        if ((uptr)(piece_start - dyld_insert_libraries) > old_env_len) break;
-        uptr piece_len = piece_end - piece_start;
-
-        // If the current piece isn't the runtime library name,
-        // append it to new_env.
-        if ((piece_len != fname_len) ||
-            (internal_strncmp(piece_start, info.dli_fname, fname_len) != 0)) {
-          if (new_env_pos != new_env + env_name_len + 1) {
-            new_env_pos[0] = ':';
-            new_env_pos++;
-          }
-          internal_strncpy(new_env_pos, piece_start, piece_len);
-        }
-        // Move on to the next piece.
-        new_env_pos += piece_len;
-        piece_start = piece_end;
-      } while (piece_start < old_env_end);
-
-      // Can't use setenv() here, because it requires the allocator to be
-      // initialized.
-      // FIXME: instead of filtering DYLD_INSERT_LIBRARIES here, do it in
-      // a separate function called after InitializeAllocator().
-      LeakyResetEnv(kDyldInsertLibraries, new_env);
+      filename_start = piece_start;
     }
-  }
+
+    // If the current piece isn't the runtime library name,
+    // append it to new_env.
+    if ((dylib_name_len != filename_len) ||
+        (internal_memcmp(filename_start, dylib_name, dylib_name_len) != 0)) {
+      if (new_env_pos != new_env + env_name_len + 1) {
+        new_env_pos[0] = ':';
+        new_env_pos++;
+      }
+      internal_strncpy(new_env_pos, piece_start, piece_len);
+      new_env_pos += piece_len;
+    }
+    // Move on to the next piece.
+    piece_start = piece_end;
+  } while (piece_start < old_env_end);
+
+  // Can't use setenv() here, because it requires the allocator to be
+  // initialized.
+  // FIXME: instead of filtering DYLD_INSERT_LIBRARIES here, do it in
+  // a separate function called after InitializeAllocator().
+  if (new_env_pos == new_env + env_name_len + 1) new_env = NULL;
+  LeakyResetEnv(kDyldInsertLibraries, new_env);
 }
 
 // No-op. Mac does not support static linkage anyway.
@@ -205,11 +222,6 @@ void AsanCheckDynamicRTPrereqs() {}
 // No-op. Mac does not support static linkage anyway.
 void AsanCheckIncompatibleRT() {}
 
-bool AsanInterceptsSignal(int signum) {
-  return (signum == SIGSEGV || signum == SIGBUS) &&
-         common_flags()->handle_segv;
-}
-
 void AsanPlatformThreadInit() {
 }
 
@@ -312,7 +324,7 @@ asan_block_context_t *alloc_asan_context(void *ctxt, dispatch_function_t func,
                                   dispatch_function_t func) {                 \
     GET_STACK_TRACE_THREAD;                                                   \
     asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack); \
-    if (common_flags()->verbosity >= 2) {                                     \
+    if (Verbosity() >= 2) {                                     \
       Report(#dispatch_x_f "(): context: %p, pthread_self: %p\n",             \
              asan_ctxt, pthread_self());                                      \
       PRINT_CURRENT_STACK();                                                  \
@@ -330,7 +342,7 @@ INTERCEPTOR(void, dispatch_after_f, dispatch_time_t when,
                                     dispatch_function_t func) {
   GET_STACK_TRACE_THREAD;
   asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack);
-  if (common_flags()->verbosity >= 2) {
+  if (Verbosity() >= 2) {
     Report("dispatch_after_f: %p\n", asan_ctxt);
     PRINT_CURRENT_STACK();
   }
@@ -343,7 +355,7 @@ INTERCEPTOR(void, dispatch_group_async_f, dispatch_group_t group,
                                           dispatch_function_t func) {
   GET_STACK_TRACE_THREAD;
   asan_block_context_t *asan_ctxt = alloc_asan_context(ctxt, func, &stack);
-  if (common_flags()->verbosity >= 2) {
+  if (Verbosity() >= 2) {
     Report("dispatch_group_async_f(): context: %p, pthread_self: %p\n",
            asan_ctxt, pthread_self());
     PRINT_CURRENT_STACK();
@@ -373,13 +385,6 @@ void dispatch_source_set_event_handler(dispatch_source_t ds, void(^work)(void));
     work(); \
   }
 
-// Forces the compiler to generate a frame pointer in the function.
-#define ENABLE_FRAME_POINTER                                       \
-  do {                                                             \
-    volatile uptr enable_fp;                                       \
-    enable_fp = GET_CURRENT_FRAME();                               \
-  } while (0)
-
 INTERCEPTOR(void, dispatch_async,
             dispatch_queue_t dq, void(^work)(void)) {
   ENABLE_FRAME_POINTER;
@@ -403,6 +408,10 @@ INTERCEPTOR(void, dispatch_after,
 
 INTERCEPTOR(void, dispatch_source_set_cancel_handler,
             dispatch_source_t ds, void(^work)(void)) {
+  if (!work) {
+    REAL(dispatch_source_set_cancel_handler)(ds, work);
+    return;
+  }
   ENABLE_FRAME_POINTER;
   GET_ASAN_BLOCK(work);
   REAL(dispatch_source_set_cancel_handler)(ds, asan_block);
diff --git a/contrib/compiler-rt/lib/asan/asan_malloc_mac.cc b/contrib/compiler-rt/lib/asan/asan_malloc_mac.cc
index 79b6dfae10f6..d7a6307c9bdc 100644
--- a/contrib/compiler-rt/lib/asan/asan_malloc_mac.cc
+++ b/contrib/compiler-rt/lib/asan/asan_malloc_mac.cc
@@ -152,13 +152,17 @@ INTERCEPTOR(int, posix_memalign, void **memptr, size_t alignment, size_t size) {
 
 namespace {
 
-// TODO(glider): the mz_* functions should be united with the Linux wrappers,
-// as they are basically copied from there.
-size_t mz_size(malloc_zone_t* zone, const void* ptr) {
+// TODO(glider): the __asan_mz_* functions should be united with the Linux
+// wrappers, as they are basically copied from there.
+extern "C"
+SANITIZER_INTERFACE_ATTRIBUTE
+size_t __asan_mz_size(malloc_zone_t* zone, const void* ptr) {
   return asan_mz_size(ptr);
 }
 
-void *mz_malloc(malloc_zone_t *zone, size_t size) {
+extern "C"
+SANITIZER_INTERFACE_ATTRIBUTE
+void *__asan_mz_malloc(malloc_zone_t *zone, uptr size) {
   if (UNLIKELY(!asan_inited)) {
     CHECK(system_malloc_zone);
     return malloc_zone_malloc(system_malloc_zone, size);
@@ -167,7 +171,9 @@ void *mz_malloc(malloc_zone_t *zone, size_t size) {
   return asan_malloc(size, &stack);
 }
 
-void *mz_calloc(malloc_zone_t *zone, size_t nmemb, size_t size) {
+extern "C"
+SANITIZER_INTERFACE_ATTRIBUTE
+void *__asan_mz_calloc(malloc_zone_t *zone, size_t nmemb, size_t size) {
   if (UNLIKELY(!asan_inited)) {
     // Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
     const size_t kCallocPoolSize = 1024;
@@ -183,7 +189,9 @@ void *mz_calloc(malloc_zone_t *zone, size_t nmemb, size_t size) {
   return asan_calloc(nmemb, size, &stack);
 }
 
-void *mz_valloc(malloc_zone_t *zone, size_t size) {
+extern "C"
+SANITIZER_INTERFACE_ATTRIBUTE
+void *__asan_mz_valloc(malloc_zone_t *zone, size_t size) {
   if (UNLIKELY(!asan_inited)) {
     CHECK(system_malloc_zone);
     return malloc_zone_valloc(system_malloc_zone, size);
@@ -210,11 +218,15 @@ void ALWAYS_INLINE free_common(void *context, void *ptr) {
 }
 
 // TODO(glider): the allocation callbacks need to be refactored.
-void mz_free(malloc_zone_t *zone, void *ptr) {
+extern "C"
+SANITIZER_INTERFACE_ATTRIBUTE
+void __asan_mz_free(malloc_zone_t *zone, void *ptr) {
   free_common(zone, ptr);
 }
 
-void *mz_realloc(malloc_zone_t *zone, void *ptr, size_t size) {
+extern "C"
+SANITIZER_INTERFACE_ATTRIBUTE
+void *__asan_mz_realloc(malloc_zone_t *zone, void *ptr, size_t size) {
   if (!ptr) {
     GET_STACK_TRACE_MALLOC;
     return asan_malloc(size, &stack);
@@ -233,15 +245,16 @@ void *mz_realloc(malloc_zone_t *zone, void *ptr, size_t size) {
   }
 }
 
-void mz_destroy(malloc_zone_t* zone) {
+extern "C"
+SANITIZER_INTERFACE_ATTRIBUTE
+void __asan_mz_destroy(malloc_zone_t* zone) {
   // A no-op -- we will not be destroyed!
-  Report("mz_destroy() called -- ignoring\n");
+  Report("__asan_mz_destroy() called -- ignoring\n");
 }
 
-  // from AvailabilityMacros.h
-#if defined(MAC_OS_X_VERSION_10_6) && \
-    MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
-void *mz_memalign(malloc_zone_t *zone, size_t align, size_t size) {
+extern "C"
+SANITIZER_INTERFACE_ATTRIBUTE
+void *__asan_mz_memalign(malloc_zone_t *zone, size_t align, size_t size) {
   if (UNLIKELY(!asan_inited)) {
     CHECK(system_malloc_zone);
     return malloc_zone_memalign(system_malloc_zone, align, size);
@@ -252,12 +265,12 @@ void *mz_memalign(malloc_zone_t *zone, size_t align, size_t size) {
 
 // This function is currently unused, and we build with -Werror.
 #if 0
-void mz_free_definite_size(malloc_zone_t* zone, void *ptr, size_t size) {
+void __asan_mz_free_definite_size(
+    malloc_zone_t* zone, void *ptr, size_t size) {
   // TODO(glider): check that |size| is valid.
   UNIMPLEMENTED();
 }
 #endif
-#endif
 
 kern_return_t mi_enumerator(task_t task, void *,
                             unsigned type_mask, vm_address_t zone_address,
@@ -299,13 +312,10 @@ void mi_statistics(malloc_zone_t *zone, malloc_statistics_t *stats) {
   internal_memcpy(stats, &malloc_stats, sizeof(malloc_statistics_t));
 }
 
-#if defined(MAC_OS_X_VERSION_10_6) && \
-    MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
 boolean_t mi_zone_locked(malloc_zone_t *zone) {
   // UNIMPLEMENTED();
   return false;
 }
-#endif
 
 }  // unnamed namespace
 
@@ -324,32 +334,25 @@ void ReplaceSystemMalloc() {
   asan_introspection.force_lock = &mi_force_lock;
   asan_introspection.force_unlock = &mi_force_unlock;
   asan_introspection.statistics = &mi_statistics;
+  asan_introspection.zone_locked = &mi_zone_locked;
 
   internal_memset(&asan_zone, 0, sizeof(malloc_zone_t));
 
-  // Start with a version 4 zone which is used for OS X 10.4 and 10.5.
-  asan_zone.version = 4;
+  // Use version 6 for OSX >= 10.6.
+  asan_zone.version = 6;
   asan_zone.zone_name = "asan";
-  asan_zone.size = &mz_size;
-  asan_zone.malloc = &mz_malloc;
-  asan_zone.calloc = &mz_calloc;
-  asan_zone.valloc = &mz_valloc;
-  asan_zone.free = &mz_free;
-  asan_zone.realloc = &mz_realloc;
-  asan_zone.destroy = &mz_destroy;
+  asan_zone.size = &__asan_mz_size;
+  asan_zone.malloc = &__asan_mz_malloc;
+  asan_zone.calloc = &__asan_mz_calloc;
+  asan_zone.valloc = &__asan_mz_valloc;
+  asan_zone.free = &__asan_mz_free;
+  asan_zone.realloc = &__asan_mz_realloc;
+  asan_zone.destroy = &__asan_mz_destroy;
   asan_zone.batch_malloc = 0;
   asan_zone.batch_free = 0;
-  asan_zone.introspect = &asan_introspection;
-
-  // from AvailabilityMacros.h
-#if defined(MAC_OS_X_VERSION_10_6) && \
-    MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
-  // Switch to version 6 on OSX 10.6 to support memalign.
-  asan_zone.version = 6;
   asan_zone.free_definite_size = 0;
-  asan_zone.memalign = &mz_memalign;
-  asan_introspection.zone_locked = &mi_zone_locked;
-#endif
+  asan_zone.memalign = &__asan_mz_memalign;
+  asan_zone.introspect = &asan_introspection;
 
   // Register the ASan zone.
   malloc_zone_register(&asan_zone);
diff --git a/contrib/compiler-rt/lib/asan/asan_mapping.h b/contrib/compiler-rt/lib/asan/asan_mapping.h
index 2746754152b6..5cb011d683d3 100644
--- a/contrib/compiler-rt/lib/asan/asan_mapping.h
+++ b/contrib/compiler-rt/lib/asan/asan_mapping.h
@@ -59,13 +59,20 @@
 // || `[0x20000000, 0x23ffffff]` || LowShadow  ||
 // || `[0x00000000, 0x1fffffff]` || LowMem     ||
 //
-// Default Linux/MIPS mapping:
+// Default Linux/MIPS32 mapping:
 // || `[0x2aaa0000, 0xffffffff]` || HighMem    ||
 // || `[0x0fff4000, 0x2aa9ffff]` || HighShadow ||
 // || `[0x0bff4000, 0x0fff3fff]` || ShadowGap  ||
 // || `[0x0aaa0000, 0x0bff3fff]` || LowShadow  ||
 // || `[0x00000000, 0x0aa9ffff]` || LowMem     ||
 //
+// Default Linux/MIPS64 mapping:
+// || `[0x4000000000, 0xffffffffff]` || HighMem    ||
+// || `[0x2800000000, 0x3fffffffff]` || HighShadow ||
+// || `[0x2400000000, 0x27ffffffff]` || ShadowGap  ||
+// || `[0x2000000000, 0x23ffffffff]` || LowShadow  ||
+// || `[0x0000000000, 0x1fffffffff]` || LowMem     ||
+//
 // Shadow mapping on FreeBSD/x86-64 with SHADOW_OFFSET == 0x400000000000:
 // || `[0x500000000000, 0x7fffffffffff]` || HighMem    ||
 // || `[0x4a0000000000, 0x4fffffffffff]` || HighShadow ||
@@ -79,6 +86,15 @@
 // || `[0x48000000, 0x4bffffff]` || ShadowGap  ||
 // || `[0x40000000, 0x47ffffff]` || LowShadow  ||
 // || `[0x00000000, 0x3fffffff]` || LowMem     ||
+//
+// Default Windows/i386 mapping:
+// (the exact location of HighShadow/HighMem may vary depending
+//  on WoW64, /LARGEADDRESSAWARE, etc).
+// || `[0x50000000, 0xffffffff]` || HighMem    ||
+// || `[0x3a000000, 0x4fffffff]` || HighShadow ||
+// || `[0x36000000, 0x39ffffff]` || ShadowGap  ||
+// || `[0x30000000, 0x35ffffff]` || LowShadow  ||
+// || `[0x00000000, 0x2fffffff]` || LowMem     ||
 
 static const u64 kDefaultShadowScale = 3;
 static const u64 kDefaultShadowOffset32 = 1ULL << 29;  // 0x20000000
@@ -87,10 +103,11 @@ static const u64 kDefaultShadowOffset64 = 1ULL << 44;
 static const u64 kDefaultShort64bitShadowOffset = 0x7FFF8000;  // < 2G.
 static const u64 kAArch64_ShadowOffset64 = 1ULL << 36;
 static const u64 kMIPS32_ShadowOffset32 = 0x0aaa0000;
-static const u64 kMIPS64_ShadowOffset64 = 1ULL << 36;
+static const u64 kMIPS64_ShadowOffset64 = 1ULL << 37;
 static const u64 kPPC64_ShadowOffset64 = 1ULL << 41;
 static const u64 kFreeBSD_ShadowOffset32 = 1ULL << 30;  // 0x40000000
 static const u64 kFreeBSD_ShadowOffset64 = 1ULL << 46;  // 0x400000000000
+static const u64 kWindowsShadowOffset32 = 3ULL << 28;  // 0x30000000
 
 #define SHADOW_SCALE kDefaultShadowScale
 #if SANITIZER_ANDROID
@@ -101,12 +118,12 @@ static const u64 kFreeBSD_ShadowOffset64 = 1ULL << 46;  // 0x400000000000
 #    define SHADOW_OFFSET kMIPS32_ShadowOffset32
 #  elif SANITIZER_FREEBSD
 #    define SHADOW_OFFSET kFreeBSD_ShadowOffset32
+#  elif SANITIZER_IOS
+#    define SHADOW_OFFSET kIosShadowOffset32
+#  elif SANITIZER_WINDOWS
+#    define SHADOW_OFFSET kWindowsShadowOffset32
 #  else
-#    if SANITIZER_IOS
-#      define SHADOW_OFFSET kIosShadowOffset32
-#    else
-#      define SHADOW_OFFSET kDefaultShadowOffset32
-#    endif
+#    define SHADOW_OFFSET kDefaultShadowOffset32
 #  endif
 # else
 #  if defined(__aarch64__)
diff --git a/contrib/compiler-rt/lib/asan/asan_poisoning.cc b/contrib/compiler-rt/lib/asan/asan_poisoning.cc
index 1c6e92f69c65..e2b1f4dc4d5e 100644
--- a/contrib/compiler-rt/lib/asan/asan_poisoning.cc
+++ b/contrib/compiler-rt/lib/asan/asan_poisoning.cc
@@ -15,13 +15,24 @@
 #include "asan_poisoning.h"
 #include "asan_report.h"
 #include "asan_stack.h"
+#include "sanitizer_common/sanitizer_atomic.h"
 #include "sanitizer_common/sanitizer_libc.h"
 #include "sanitizer_common/sanitizer_flags.h"
 
 namespace __asan {
 
+static atomic_uint8_t can_poison_memory;
+
+void SetCanPoisonMemory(bool value) {
+  atomic_store(&can_poison_memory, value, memory_order_release);
+}
+
+bool CanPoisonMemory() {
+  return atomic_load(&can_poison_memory, memory_order_acquire);
+}
+
 void PoisonShadow(uptr addr, uptr size, u8 value) {
-  if (!flags()->poison_heap) return;
+  if (!CanPoisonMemory()) return;
   CHECK(AddrIsAlignedByGranularity(addr));
   CHECK(AddrIsInMem(addr));
   CHECK(AddrIsAlignedByGranularity(addr + size));
@@ -34,7 +45,7 @@ void PoisonShadowPartialRightRedzone(uptr addr,
                                      uptr size,
                                      uptr redzone_size,
                                      u8 value) {
-  if (!flags()->poison_heap) return;
+  if (!CanPoisonMemory()) return;
   CHECK(AddrIsAlignedByGranularity(addr));
   CHECK(AddrIsInMem(addr));
   FastPoisonShadowPartialRightRedzone(addr, size, redzone_size, value);
@@ -63,10 +74,10 @@ void FlushUnneededASanShadowMemory(uptr p, uptr size) {
 
 void AsanPoisonOrUnpoisonIntraObjectRedzone(uptr ptr, uptr size, bool poison) {
   uptr end = ptr + size;
-  if (common_flags()->verbosity) {
+  if (Verbosity()) {
     Printf("__asan_%spoison_intra_object_redzone [%p,%p) %zd\n",
            poison ? "" : "un", ptr, end, size);
-    if (common_flags()->verbosity >= 2)
+    if (Verbosity() >= 2)
       PRINT_CURRENT_STACK();
   }
   CHECK(size);
diff --git a/contrib/compiler-rt/lib/asan/asan_poisoning.h b/contrib/compiler-rt/lib/asan/asan_poisoning.h
index feda1a984544..3fc94649fb39 100644
--- a/contrib/compiler-rt/lib/asan/asan_poisoning.h
+++ b/contrib/compiler-rt/lib/asan/asan_poisoning.h
@@ -19,6 +19,10 @@
 
 namespace __asan {
 
+// Enable/disable memory poisoning.
+void SetCanPoisonMemory(bool value);
+bool CanPoisonMemory();
+
 // Poisons the shadow memory for "size" bytes starting from "addr".
 void PoisonShadow(uptr addr, uptr size, u8 value);
 
@@ -34,7 +38,7 @@ void PoisonShadowPartialRightRedzone(uptr addr,
 // performance-critical code with care.
 ALWAYS_INLINE void FastPoisonShadow(uptr aligned_beg, uptr aligned_size,
                                     u8 value) {
-  DCHECK(flags()->poison_heap);
+  DCHECK(CanPoisonMemory());
   uptr shadow_beg = MEM_TO_SHADOW(aligned_beg);
   uptr shadow_end = MEM_TO_SHADOW(
       aligned_beg + aligned_size - SHADOW_GRANULARITY) + 1;
@@ -60,15 +64,14 @@ ALWAYS_INLINE void FastPoisonShadow(uptr aligned_beg, uptr aligned_size,
       if (page_end != shadow_end) {
         REAL(memset)((void *)page_end, 0, shadow_end - page_end);
       }
-      void *res = MmapFixedNoReserve(page_beg, page_end - page_beg);
-      CHECK_EQ(page_beg, res);
+      ReserveShadowMemoryRange(page_beg, page_end - 1);
     }
   }
 }
 
 ALWAYS_INLINE void FastPoisonShadowPartialRightRedzone(
     uptr aligned_addr, uptr size, uptr redzone_size, u8 value) {
-  DCHECK(flags()->poison_heap);
+  DCHECK(CanPoisonMemory());
   bool poison_partial = flags()->poison_partial;
   u8 *shadow = (u8*)MEM_TO_SHADOW(aligned_addr);
   for (uptr i = 0; i < redzone_size; i += SHADOW_GRANULARITY, shadow++) {
diff --git a/contrib/compiler-rt/lib/asan/asan_report.cc b/contrib/compiler-rt/lib/asan/asan_report.cc
index 0fb50276186b..8706d5decc0b 100644
--- a/contrib/compiler-rt/lib/asan/asan_report.cc
+++ b/contrib/compiler-rt/lib/asan/asan_report.cc
@@ -53,7 +53,7 @@ void AppendToErrorMessageBuffer(const char *buffer) {
                      buffer, remaining);
     error_message_buffer[error_message_buffer_size - 1] = '\0';
     // FIXME: reallocate the buffer instead of truncating the message.
-    error_message_buffer_pos += remaining > length ? length : remaining;
+    error_message_buffer_pos += Min(remaining, length);
   }
 }
 
@@ -937,6 +937,8 @@ using namespace __asan;  // NOLINT
 
 void __asan_report_error(uptr pc, uptr bp, uptr sp, uptr addr, int is_write,
                          uptr access_size) {
+  ENABLE_FRAME_POINTER;
+
   // Determine the error type.
   const char *bug_descr = "unknown-crash";
   if (AddrIsInMem(addr)) {
diff --git a/contrib/compiler-rt/lib/asan/asan_rtl.cc b/contrib/compiler-rt/lib/asan/asan_rtl.cc
index 34fb111d5607..0b2a23d40379 100644
--- a/contrib/compiler-rt/lib/asan/asan_rtl.cc
+++ b/contrib/compiler-rt/lib/asan/asan_rtl.cc
@@ -56,8 +56,6 @@ static void AsanDie() {
   }
   if (common_flags()->coverage)
     __sanitizer_cov_dump();
-  if (death_callback)
-    death_callback();
   if (flags()->abort_on_error)
     Abort();
   internal__exit(flags()->exitcode);
@@ -72,265 +70,9 @@ static void AsanCheckFailed(const char *file, int line, const char *cond,
   Die();
 }
 
-// -------------------------- Flags ------------------------- {{{1
-static const int kDefaultMallocContextSize = 30;
-
-Flags asan_flags_dont_use_directly;  // use via flags().
-
-static const char *MaybeCallAsanDefaultOptions() {
-  return (&__asan_default_options) ? __asan_default_options() : "";
-}
-
-static const char *MaybeUseAsanDefaultOptionsCompileDefinition() {
-#ifdef ASAN_DEFAULT_OPTIONS
-// Stringize the macro value.
-# define ASAN_STRINGIZE(x) #x
-# define ASAN_STRINGIZE_OPTIONS(options) ASAN_STRINGIZE(options)
-  return ASAN_STRINGIZE_OPTIONS(ASAN_DEFAULT_OPTIONS);
-#else
-  return "";
-#endif
-}
-
-static void ParseFlagsFromString(Flags *f, const char *str) {
-  CommonFlags *cf = common_flags();
-  ParseCommonFlagsFromString(cf, str);
-  CHECK((uptr)cf->malloc_context_size <= kStackTraceMax);
-  // Please write meaningful flag descriptions when adding new flags.
-  ParseFlag(str, &f->quarantine_size, "quarantine_size",
-            "Size (in bytes) of quarantine used to detect use-after-free "
-            "errors. Lower value may reduce memory usage but increase the "
-            "chance of false negatives.");
-  ParseFlag(str, &f->redzone, "redzone",
-            "Minimal size (in bytes) of redzones around heap objects. "
-            "Requirement: redzone >= 16, is a power of two.");
-  ParseFlag(str, &f->max_redzone, "max_redzone",
-            "Maximal size (in bytes) of redzones around heap objects.");
-  CHECK_GE(f->redzone, 16);
-  CHECK_GE(f->max_redzone, f->redzone);
-  CHECK_LE(f->max_redzone, 2048);
-  CHECK(IsPowerOfTwo(f->redzone));
-  CHECK(IsPowerOfTwo(f->max_redzone));
-
-  ParseFlag(str, &f->debug, "debug",
-      "If set, prints some debugging information and does additional checks.");
-  ParseFlag(str, &f->report_globals, "report_globals",
-      "Controls the way to handle globals (0 - don't detect buffer overflow on "
-      "globals, 1 - detect buffer overflow, 2 - print data about registered "
-      "globals).");
-
-  ParseFlag(str, &f->check_initialization_order,
-      "check_initialization_order",
-      "If set, attempts to catch initialization order issues.");
-
-  ParseFlag(str, &f->replace_str, "replace_str",
-      "If set, uses custom wrappers and replacements for libc string functions "
-      "to find more errors.");
-
-  ParseFlag(str, &f->replace_intrin, "replace_intrin",
-      "If set, uses custom wrappers for memset/memcpy/memmove intinsics.");
-  ParseFlag(str, &f->mac_ignore_invalid_free, "mac_ignore_invalid_free",
-      "Ignore invalid free() calls to work around some bugs. Used on OS X "
-      "only.");
-  ParseFlag(str, &f->detect_stack_use_after_return,
-      "detect_stack_use_after_return",
-      "Enables stack-use-after-return checking at run-time.");
-  ParseFlag(str, &f->min_uar_stack_size_log, "min_uar_stack_size_log",
-      "Minimum fake stack size log.");
-  ParseFlag(str, &f->max_uar_stack_size_log, "max_uar_stack_size_log",
-      "Maximum fake stack size log.");
-  ParseFlag(str, &f->uar_noreserve, "uar_noreserve",
-      "Use mmap with 'norserve' flag to allocate fake stack.");
-  ParseFlag(str, &f->max_malloc_fill_size, "max_malloc_fill_size",
-      "ASan allocator flag. max_malloc_fill_size is the maximal amount of "
-      "bytes that will be filled with malloc_fill_byte on malloc.");
-  ParseFlag(str, &f->malloc_fill_byte, "malloc_fill_byte",
-      "Value used to fill the newly allocated memory.");
-  ParseFlag(str, &f->exitcode, "exitcode",
-      "Override the program exit status if the tool found an error.");
-  ParseFlag(str, &f->allow_user_poisoning, "allow_user_poisoning",
-      "If set, user may manually mark memory regions as poisoned or "
-      "unpoisoned.");
-  ParseFlag(str, &f->sleep_before_dying, "sleep_before_dying",
-      "Number of seconds to sleep between printing an error report and "
-      "terminating the program. Useful for debugging purposes (e.g. when one "
-      "needs to attach gdb).");
-
-  ParseFlag(str, &f->check_malloc_usable_size, "check_malloc_usable_size",
-      "Allows the users to work around the bug in Nvidia drivers prior to "
-      "295.*.");
-
-  ParseFlag(str, &f->unmap_shadow_on_exit, "unmap_shadow_on_exit",
-      "If set, explicitly unmaps the (huge) shadow at exit.");
-  ParseFlag(str, &f->abort_on_error, "abort_on_error",
-      "If set, the tool calls abort() instead of _exit() after printing the "
-      "error report.");
-  ParseFlag(str, &f->print_stats, "print_stats",
-      "Print various statistics after printing an error message or if "
-      "atexit=1.");
-  ParseFlag(str, &f->print_legend, "print_legend",
-      "Print the legend for the shadow bytes.");
-  ParseFlag(str, &f->atexit, "atexit",
-      "If set, prints ASan exit stats even after program terminates "
-      "successfully.");
-
-  ParseFlag(str, &f->allow_reexec, "allow_reexec",
-      "Allow the tool to re-exec the program. This may interfere badly with "
-      "the debugger.");
-
-  ParseFlag(str, &f->print_full_thread_history,
-      "print_full_thread_history",
-      "If set, prints thread creation stacks for the threads involved in the "
-      "report and their ancestors up to the main thread.");
-
-  ParseFlag(str, &f->poison_heap, "poison_heap",
-      "Poison (or not) the heap memory on [de]allocation. Zero value is useful "
-      "for benchmarking the allocator or instrumentator.");
-
-  ParseFlag(str, &f->poison_array_cookie, "poison_array_cookie",
-      "Poison (or not) the array cookie after operator new[].");
-
-  ParseFlag(str, &f->poison_partial, "poison_partial",
-      "If true, poison partially addressable 8-byte aligned words "
-      "(default=true). This flag affects heap and global buffers, but not "
-      "stack buffers.");
-
-  ParseFlag(str, &f->alloc_dealloc_mismatch, "alloc_dealloc_mismatch",
-      "Report errors on malloc/delete, new/free, new/delete[], etc.");
-
-  ParseFlag(str, &f->new_delete_type_mismatch, "new_delete_type_mismatch",
-      "Report errors on mismatch betwen size of new and delete.");
-
-  ParseFlag(str, &f->strict_memcmp, "strict_memcmp",
-      "If true, assume that memcmp(p1, p2, n) always reads n bytes before "
-      "comparing p1 and p2.");
-
-  ParseFlag(str, &f->strict_init_order, "strict_init_order",
-      "If true, assume that dynamic initializers can never access globals from "
-      "other modules, even if the latter are already initialized.");
-
-  ParseFlag(str, &f->start_deactivated, "start_deactivated",
-      "If true, ASan tweaks a bunch of other flags (quarantine, redzone, heap "
-      "poisoning) to reduce memory consumption as much as possible, and "
-      "restores them to original values when the first instrumented module is "
-      "loaded into the process. This is mainly intended to be used on "
-      "Android. ");
-
-  ParseFlag(str, &f->detect_invalid_pointer_pairs,
-      "detect_invalid_pointer_pairs",
-      "If non-zero, try to detect operations like <, <=, >, >= and - on "
-      "invalid pointer pairs (e.g. when pointers belong to different objects). "
-      "The bigger the value the harder we try.");
-
-  ParseFlag(str, &f->detect_container_overflow,
-      "detect_container_overflow",
-      "If true, honor the container overflow  annotations. "
-      "See https://code.google.com/p/address-sanitizer/wiki/ContainerOverflow");
-
-  ParseFlag(str, &f->detect_odr_violation, "detect_odr_violation",
-            "If >=2, detect violation of One-Definition-Rule (ODR); "
-            "If ==1, detect ODR-violation only if the two variables "
-            "have different sizes");
-
-  ParseFlag(str, &f->dump_instruction_bytes, "dump_instruction_bytes",
-      "If true, dump 16 bytes starting at the instruction that caused SEGV");
-}
-
-void InitializeFlags(Flags *f, const char *env) {
-  CommonFlags *cf = common_flags();
-  SetCommonFlagsDefaults(cf);
-  cf->detect_leaks = CAN_SANITIZE_LEAKS;
-  cf->external_symbolizer_path = GetEnv("ASAN_SYMBOLIZER_PATH");
-  cf->malloc_context_size = kDefaultMallocContextSize;
-  cf->intercept_tls_get_addr = true;
-  cf->coverage = false;
-
-  internal_memset(f, 0, sizeof(*f));
-  f->quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 26 : 1UL << 28;
-  f->redzone = 16;
-  f->max_redzone = 2048;
-  f->debug = false;
-  f->report_globals = 1;
-  f->check_initialization_order = false;
-  f->replace_str = true;
-  f->replace_intrin = true;
-  f->mac_ignore_invalid_free = false;
-  f->detect_stack_use_after_return = false;  // Also needs the compiler flag.
-  f->min_uar_stack_size_log = 16;  // We can't do smaller anyway.
-  f->max_uar_stack_size_log = 20;  // 1Mb per size class, i.e. ~11Mb per thread.
-  f->uar_noreserve = false;
-  f->max_malloc_fill_size = 0x1000;  // By default, fill only the first 4K.
-  f->malloc_fill_byte = 0xbe;
-  f->exitcode = ASAN_DEFAULT_FAILURE_EXITCODE;
-  f->allow_user_poisoning = true;
-  f->sleep_before_dying = 0;
-  f->check_malloc_usable_size = true;
-  f->unmap_shadow_on_exit = false;
-  f->abort_on_error = false;
-  f->print_stats = false;
-  f->print_legend = true;
-  f->atexit = false;
-  f->allow_reexec = true;
-  f->print_full_thread_history = true;
-  f->poison_heap = true;
-  f->poison_array_cookie = true;
-  f->poison_partial = true;
-  // Turn off alloc/dealloc mismatch checker on Mac and Windows for now.
-  // https://code.google.com/p/address-sanitizer/issues/detail?id=131
-  // https://code.google.com/p/address-sanitizer/issues/detail?id=309
-  // TODO(glider,timurrrr): Fix known issues and enable this back.
-  f->alloc_dealloc_mismatch = (SANITIZER_MAC == 0) && (SANITIZER_WINDOWS == 0);
-  f->new_delete_type_mismatch = true;
-  f->strict_memcmp = true;
-  f->strict_init_order = false;
-  f->start_deactivated = false;
-  f->detect_invalid_pointer_pairs = 0;
-  f->detect_container_overflow = true;
-  f->detect_odr_violation = 2;
-  f->dump_instruction_bytes = false;
-
-  // Override from compile definition.
-  ParseFlagsFromString(f, MaybeUseAsanDefaultOptionsCompileDefinition());
-
-  // Override from user-specified string.
-  ParseFlagsFromString(f, MaybeCallAsanDefaultOptions());
-  VReport(1, "Using the defaults from __asan_default_options: %s\n",
-          MaybeCallAsanDefaultOptions());
-
-  // Override from command line.
-  ParseFlagsFromString(f, env);
-  if (common_flags()->help) {
-    PrintFlagDescriptions();
-  }
-
-  if (!CAN_SANITIZE_LEAKS && cf->detect_leaks) {
-    Report("%s: detect_leaks is not supported on this platform.\n",
-           SanitizerToolName);
-    cf->detect_leaks = false;
-  }
-
-  // Make "strict_init_order" imply "check_initialization_order".
-  // TODO(samsonov): Use a single runtime flag for an init-order checker.
-  if (f->strict_init_order) {
-    f->check_initialization_order = true;
-  }
-}
-
-// Parse flags that may change between startup and activation.
-// On Android they come from a system property.
-// On other platforms this is no-op.
-void ParseExtraActivationFlags() {
-  char buf[100];
-  GetExtraActivationFlags(buf, sizeof(buf));
-  ParseFlagsFromString(flags(), buf);
-  if (buf[0] != '\0')
-    VReport(1, "Extra activation flags: %s\n", buf);
-}
-
 // -------------------------- Globals --------------------- {{{1
 int asan_inited;
 bool asan_init_is_running;
-void (*death_callback)(void);
 
 #if !ASAN_FIXED_MAPPING
 uptr kHighMemEnd, kMidMemBeg, kMidMemEnd;
@@ -344,7 +86,8 @@ void ShowStatsAndAbort() {
 
 // ---------------------- mmap -------------------- {{{1
 // Reserve memory range [beg, end].
-static void ReserveShadowMemoryRange(uptr beg, uptr end) {
+// We need to use inclusive range because end+1 may not be representable.
+void ReserveShadowMemoryRange(uptr beg, uptr end) {
   CHECK_EQ((beg % GetPageSizeCached()), 0);
   CHECK_EQ(((end + 1) % GetPageSizeCached()), 0);
   uptr size = end - beg + 1;
@@ -355,6 +98,10 @@ static void ReserveShadowMemoryRange(uptr beg, uptr end) {
            "Perhaps you're using ulimit -v\n", size);
     Abort();
   }
+  if (common_flags()->no_huge_pages_for_shadow)
+    NoHugePagesInRegion(beg, size);
+  if (common_flags()->use_madv_dontdump)
+    DontDumpShadowMemory(beg, size);
 }
 
 // --------------- LowLevelAllocateCallbac ---------- {{{1
@@ -500,7 +247,13 @@ static void InitializeHighMemEnd() {
 }
 
 static void ProtectGap(uptr a, uptr size) {
-  CHECK_EQ(a, (uptr)Mprotect(a, size));
+  void *res = Mprotect(a, size);
+  if (a == (uptr)res)
+    return;
+  Report("ERROR: Failed to protect the shadow gap. "
+         "ASan cannot proceed correctly. ABORTING.\n");
+  DumpProcessMap();
+  Die();
 }
 
 static void PrintAddressSpaceLayout() {
@@ -539,7 +292,7 @@ static void PrintAddressSpaceLayout() {
   Printf("\n");
   Printf("redzone=%zu\n", (uptr)flags()->redzone);
   Printf("max_redzone=%zu\n", (uptr)flags()->max_redzone);
-  Printf("quarantine_size=%zuM\n", (uptr)flags()->quarantine_size >> 20);
+  Printf("quarantine_size_mb=%zuM\n", (uptr)flags()->quarantine_size_mb);
   Printf("malloc_context_size=%zu\n",
          (uptr)common_flags()->malloc_context_size);
 
@@ -561,8 +314,10 @@ static void AsanInitInternal() {
 
   // Initialize flags. This must be done early, because most of the
   // initialization steps look at flags().
-  const char *options = GetEnv("ASAN_OPTIONS");
-  InitializeFlags(flags(), options);
+  InitializeFlags(flags());
+
+  SetCanPoisonMemory(flags()->poison_heap);
+  SetMallocContextSize(common_flags()->malloc_context_size);
 
   InitializeHighMemEnd();
 
@@ -574,20 +329,11 @@ static void AsanInitInternal() {
   SetCheckFailedCallback(AsanCheckFailed);
   SetPrintfAndReportCallback(AppendToErrorMessageBuffer);
 
-  if (!flags()->start_deactivated)
-    ParseExtraActivationFlags();
-
   __sanitizer_set_report_path(common_flags()->log_path);
+
+  // Enable UAR detection, if required.
   __asan_option_detect_stack_use_after_return =
       flags()->detect_stack_use_after_return;
-  CHECK_LE(flags()->min_uar_stack_size_log, flags()->max_uar_stack_size_log);
-
-  if (options) {
-    VReport(1, "Parsed ASAN_OPTIONS: %s\n", options);
-  }
-
-  if (flags()->start_deactivated)
-    AsanStartDeactivated();
 
   // Re-exec ourselves if we need to set additional env or command line args.
   MaybeReexec();
@@ -618,8 +364,7 @@ static void AsanInitInternal() {
   }
 #endif
 
-  if (common_flags()->verbosity)
-    PrintAddressSpaceLayout();
+  if (Verbosity()) PrintAddressSpaceLayout();
 
   DisableCoreDumperIfNecessary();
 
@@ -649,6 +394,8 @@ static void AsanInitInternal() {
   } else {
     Report("Shadow memory range interleaves with an existing memory mapping. "
            "ASan cannot proceed correctly. ABORTING.\n");
+    Report("ASan shadow was supposed to be located in the [%p-%p] range.\n",
+           shadow_start, kHighShadowEnd);
     DumpProcessMap();
     Die();
   }
@@ -656,7 +403,12 @@ static void AsanInitInternal() {
   AsanTSDInit(PlatformTSDDtor);
   InstallDeadlySignalHandlers(AsanOnSIGSEGV);
 
-  InitializeAllocator();
+  AllocatorOptions allocator_options;
+  allocator_options.SetFrom(flags(), common_flags());
+  InitializeAllocator(allocator_options);
+
+  MaybeStartBackgroudThread();
+  SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
 
   // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
   // should be set to 1 prior to initializing the threads.
@@ -666,10 +418,12 @@ static void AsanInitInternal() {
   if (flags()->atexit)
     Atexit(asan_atexit);
 
-  if (common_flags()->coverage) {
-    __sanitizer_cov_init();
-    Atexit(__sanitizer_cov_dump);
-  }
+  InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
+
+  // Now that ASan runtime is (mostly) initialized, deactivate it if
+  // necessary, so that it can be re-activated when requested.
+  if (flags()->start_deactivated)
+    AsanDeactivate();
 
   // interceptors
   InitTlsSize();
@@ -724,13 +478,6 @@ static AsanInitializer asan_initializer;
 // ---------------------- Interface ---------------- {{{1
 using namespace __asan;  // NOLINT
 
-#if !SANITIZER_SUPPORTS_WEAK_HOOKS
-extern "C" {
-SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
-const char* __asan_default_options() { return ""; }
-}  // extern "C"
-#endif
-
 int NOINLINE __asan_set_error_exit_code(int exit_code) {
   int old = flags()->exitcode;
   flags()->exitcode = exit_code;
@@ -764,7 +511,7 @@ void NOINLINE __asan_handle_no_return() {
 }
 
 void NOINLINE __asan_set_death_callback(void (*callback)(void)) {
-  death_callback = callback;
+  SetUserDieCallback(callback);
 }
 
 // Initialize as requested from instrumented application code.
diff --git a/contrib/compiler-rt/lib/asan/asan_stack.cc b/contrib/compiler-rt/lib/asan/asan_stack.cc
index 8188f3b5b6e9..cf7a587fa65a 100644
--- a/contrib/compiler-rt/lib/asan/asan_stack.cc
+++ b/contrib/compiler-rt/lib/asan/asan_stack.cc
@@ -13,6 +13,21 @@
 //===----------------------------------------------------------------------===//
 #include "asan_internal.h"
 #include "asan_stack.h"
+#include "sanitizer_common/sanitizer_atomic.h"
+
+namespace __asan {
+
+static atomic_uint32_t malloc_context_size;
+
+void SetMallocContextSize(u32 size) {
+  atomic_store(&malloc_context_size, size, memory_order_release);
+}
+
+u32 GetMallocContextSize() {
+  return atomic_load(&malloc_context_size, memory_order_acquire);
+}
+
+}  // namespace __asan
 
 // ------------------ Interface -------------- {{{1
 
diff --git a/contrib/compiler-rt/lib/asan/asan_stack.h b/contrib/compiler-rt/lib/asan/asan_stack.h
index a995256212e1..122967a152f8 100644
--- a/contrib/compiler-rt/lib/asan/asan_stack.h
+++ b/contrib/compiler-rt/lib/asan/asan_stack.h
@@ -21,6 +21,11 @@
 
 namespace __asan {
 
+static const u32 kDefaultMallocContextSize = 30;
+
+void SetMallocContextSize(u32 size);
+u32 GetMallocContextSize();
+
 // Get the stack trace with the given pc and bp.
 // The pc will be in the position 0 of the resulting stack trace.
 // The bp may refer to the current frame or to the caller's frame.
@@ -93,9 +98,8 @@ void GetStackTraceWithPcBpAndContext(BufferedStackTrace *stack, uptr max_depth,
 #define GET_STACK_TRACE_THREAD                                    \
   GET_STACK_TRACE(kStackTraceMax, true)
 
-#define GET_STACK_TRACE_MALLOC                                    \
-  GET_STACK_TRACE(common_flags()->malloc_context_size,            \
-                  common_flags()->fast_unwind_on_malloc)
+#define GET_STACK_TRACE_MALLOC                                                 \
+  GET_STACK_TRACE(GetMallocContextSize(), common_flags()->fast_unwind_on_malloc)
 
 #define GET_STACK_TRACE_FREE GET_STACK_TRACE_MALLOC
 
diff --git a/contrib/compiler-rt/lib/asan/scripts/asan_device_setup b/contrib/compiler-rt/lib/asan/scripts/asan_device_setup
index a620f51b0836..c143b9fab13c 100755
--- a/contrib/compiler-rt/lib/asan/scripts/asan_device_setup
+++ b/contrib/compiler-rt/lib/asan/scripts/asan_device_setup
@@ -87,6 +87,7 @@ if [[ x$device != x ]]; then
 fi
 
 echo '>> Remounting /system rw'
+$ADB wait-for-device
 $ADB root
 $ADB wait-for-device
 $ADB remount
@@ -184,7 +185,7 @@ cp "$ASAN_RT_PATH/$ASAN_RT" "$TMPDIR/"
 ASAN_OPTIONS=start_deactivated=1,alloc_dealloc_mismatch=0
 
 # On Android-L not allowing user segv handler breaks some applications.
-if $ADB shell 'echo $LD_PRELOAD' | grep libsigchain.so >&/dev/null; then
+if [[ PRE_L -eq 0 ]]; then
     ASAN_OPTIONS="$ASAN_OPTIONS,allow_user_segv_handler=1"
 fi
 
diff --git a/contrib/compiler-rt/lib/asan/scripts/asan_symbolize.py b/contrib/compiler-rt/lib/asan/scripts/asan_symbolize.py
index 5fca136b6950..59fceaaed814 100755
--- a/contrib/compiler-rt/lib/asan/scripts/asan_symbolize.py
+++ b/contrib/compiler-rt/lib/asan/scripts/asan_symbolize.py
@@ -11,11 +11,9 @@ import argparse
 import bisect
 import getopt
 import os
-import pty
 import re
 import subprocess
 import sys
-import termios
 
 symbolizers = {}
 DEBUG = False
@@ -171,6 +169,9 @@ class UnbufferedLineConverter(object):
   output.  Uses pty to trick the child into providing unbuffered output.
   """
   def __init__(self, args, close_stderr=False):
+    # Local imports so that the script can start on Windows.
+    import pty
+    import termios
     pid, fd = pty.fork()
     if pid == 0:
       # We're the child. Transfer control to command.
@@ -341,17 +342,23 @@ class BreakpadSymbolizer(Symbolizer):
 
 class SymbolizationLoop(object):
   def __init__(self, binary_name_filter=None, dsym_hint_producer=None):
-    # Used by clients who may want to supply a different binary name.
-    # E.g. in Chrome several binaries may share a single .dSYM.
-    self.binary_name_filter = binary_name_filter
-    self.dsym_hint_producer = dsym_hint_producer
-    self.system = os.uname()[0]
-    if self.system not in ['Linux', 'Darwin', 'FreeBSD']:
-      raise Exception('Unknown system')
-    self.llvm_symbolizers = {}
-    self.last_llvm_symbolizer = None
-    self.dsym_hints = set([])
-    self.frame_no = 0
+    if sys.platform == 'win32':
+      # ASan on Windows uses dbghelp.dll to symbolize in-process, which works
+      # even in sandboxed processes.  Nothing needs to be done here.
+      self.process_line = self.process_line_echo
+    else:
+      # Used by clients who may want to supply a different binary name.
+      # E.g. in Chrome several binaries may share a single .dSYM.
+      self.binary_name_filter = binary_name_filter
+      self.dsym_hint_producer = dsym_hint_producer
+      self.system = os.uname()[0]
+      if self.system not in ['Linux', 'Darwin', 'FreeBSD']:
+        raise Exception('Unknown system')
+      self.llvm_symbolizers = {}
+      self.last_llvm_symbolizer = None
+      self.dsym_hints = set([])
+      self.frame_no = 0
+      self.process_line = self.process_line_posix
 
   def symbolize_address(self, addr, binary, offset):
     # On non-Darwin (i.e. on platforms without .dSYM debug info) always use
@@ -366,12 +373,12 @@ class SymbolizationLoop(object):
     #  3. otherwise create a new symbolizer and pass all currently known
     #     .dSYM hints to it.
     if not binary in self.llvm_symbolizers:
-      use_last_symbolizer = True
+      use_new_symbolizer = True
       if self.system == 'Darwin' and self.dsym_hint_producer:
         dsym_hints_for_binary = set(self.dsym_hint_producer(binary))
-        use_last_symbolizer = bool(dsym_hints_for_binary - self.dsym_hints)
+        use_new_symbolizer = bool(dsym_hints_for_binary - self.dsym_hints)
         self.dsym_hints |= dsym_hints_for_binary
-      if self.last_llvm_symbolizer and use_last_symbolizer:
+      if self.last_llvm_symbolizer and not use_new_symbolizer:
           self.llvm_symbolizers[binary] = self.last_llvm_symbolizer
       else:
         self.last_llvm_symbolizer = LLVMSymbolizerFactory(
@@ -405,14 +412,14 @@ class SymbolizationLoop(object):
 
   def process_logfile(self):
     self.frame_no = 0
-    while True:
-      line = logfile.readline()
-      if not line:
-        break
+    for line in logfile:
       processed = self.process_line(line)
       print '\n'.join(processed)
 
-  def process_line(self, line):
+  def process_line_echo(self, line):
+    return [line.rstrip()]
+
+  def process_line_posix(self, line):
     self.current_line = line.rstrip()
     #0 0x7f6e35cf2e45  (/blah/foo.so+0x11fe45)
     stack_trace_line_format = (
@@ -437,20 +444,23 @@ class SymbolizationLoop(object):
 
 
 if __name__ == '__main__':
-  parser = argparse.ArgumentParser(formatter_class=argparse.RawDescriptionHelpFormatter,
-  description='ASan symbolization script',
-  epilog='''Example of use:
-  asan_symbolize.py -c "$HOME/opt/cross/bin/arm-linux-gnueabi-" -s "$HOME/SymbolFiles" < asan.log''')
+  parser = argparse.ArgumentParser(
+      formatter_class=argparse.RawDescriptionHelpFormatter,
+      description='ASan symbolization script',
+      epilog='Example of use:\n'
+             'asan_symbolize.py -c "$HOME/opt/cross/bin/arm-linux-gnueabi-" '
+             '-s "$HOME/SymbolFiles" < asan.log')
   parser.add_argument('path_to_cut', nargs='*',
-    help='pattern to be cut from the result file path ')
+                      help='pattern to be cut from the result file path ')
   parser.add_argument('-d','--demangle', action='store_true',
-    help='demangle function names')
+                      help='demangle function names')
   parser.add_argument('-s', metavar='SYSROOT',
-    help='set path to sysroot for sanitized binaries')
+                      help='set path to sysroot for sanitized binaries')
   parser.add_argument('-c', metavar='CROSS_COMPILE',
-    help='set prefix for binutils')
-  parser.add_argument('-l','--logfile', default=sys.stdin, type=argparse.FileType('r'),
-    help='set log file name to parse, default is stdin')
+                      help='set prefix for binutils')
+  parser.add_argument('-l','--logfile', default=sys.stdin,
+                      type=argparse.FileType('r'),
+                      help='set log file name to parse, default is stdin')
   args = parser.parse_args()
   if args.path_to_cut:
     fix_filename_patterns = args.path_to_cut
diff --git a/contrib/compiler-rt/lib/asan/tests/asan_interface_test.cc b/contrib/compiler-rt/lib/asan/tests/asan_interface_test.cc
index 50fdf1119f0b..a34c8528eae0 100644
--- a/contrib/compiler-rt/lib/asan/tests/asan_interface_test.cc
+++ b/contrib/compiler-rt/lib/asan/tests/asan_interface_test.cc
@@ -87,7 +87,7 @@ TEST(AddressSanitizerInterface, GetCurrentAllocatedBytesTest) {
 }
 
 TEST(AddressSanitizerInterface, GetHeapSizeTest) {
-  // asan_allocator2 does not keep huge chunks in free list, but unmaps them.
+  // ASan allocator does not keep huge chunks in free list, but unmaps them.
   // The chunk should be greater than the quarantine size,
   // otherwise it will be stuck in quarantine instead of being unmaped.
   static const size_t kLargeMallocSize = (1 << 28) + 1;  // 256M
diff --git a/contrib/compiler-rt/lib/asan/tests/asan_noinst_test.cc b/contrib/compiler-rt/lib/asan/tests/asan_noinst_test.cc
index bb6af45bddf9..c469d62a6766 100644
--- a/contrib/compiler-rt/lib/asan/tests/asan_noinst_test.cc
+++ b/contrib/compiler-rt/lib/asan/tests/asan_noinst_test.cc
@@ -31,15 +31,6 @@
 // in this test. The static runtime library is linked explicitly (without
 // -fsanitize=address), thus the interceptors do not work correctly on OS X.
 
-#if !defined(_WIN32)
-extern "C" {
-// Set specific ASan options for uninstrumented unittest.
-const char* __asan_default_options() {
-  return "allow_reexec=0";
-}
-}  // extern "C"
-#endif
-
 // Make sure __asan_init is called before any test case is run.
 struct AsanInitCaller {
   AsanInitCaller() { __asan_init(); }
diff --git a/contrib/compiler-rt/lib/asan/tests/asan_test.cc b/contrib/compiler-rt/lib/asan/tests/asan_test.cc
index 67bcbaca1e40..952b05e21fe2 100644
--- a/contrib/compiler-rt/lib/asan/tests/asan_test.cc
+++ b/contrib/compiler-rt/lib/asan/tests/asan_test.cc
@@ -603,7 +603,8 @@ NOINLINE void SigLongJmpFunc1(sigjmp_buf buf) {
 }
 
 #if !defined(__ANDROID__) && !defined(__arm__) && \
-    !defined(__powerpc64__) && !defined(__powerpc__)
+    !defined(__powerpc64__) && !defined(__powerpc__) && \
+    !defined(__aarch64__)
 // Does not work on Power and ARM:
 // https://code.google.com/p/address-sanitizer/issues/detail?id=185
 TEST(AddressSanitizer, BuiltinLongJmpTest) {
@@ -1284,3 +1285,33 @@ TEST(AddressSanitizer, pthread_getschedparam) {
   ASSERT_EQ(0, res);
 }
 #endif
+
+#if SANITIZER_TEST_HAS_PRINTF_L
+static int vsnprintf_l_wrapper(char *s, size_t n,
+                               locale_t l, const char *format, ...) {
+  va_list va;
+  va_start(va, format);
+  int res = vsnprintf_l(s, n , l, format, va);
+  va_end(va);
+  return res;
+}
+
+TEST(AddressSanitizer, snprintf_l) {
+  char buff[5];
+  // Check that snprintf_l() works fine with Asan.
+  int res = snprintf_l(buff, 5,
+                       _LIBCPP_GET_C_LOCALE, "%s", "snprintf_l()");
+  EXPECT_EQ(12, res);
+  // Check that vsnprintf_l() works fine with Asan.
+  res = vsnprintf_l_wrapper(buff, 5,
+                            _LIBCPP_GET_C_LOCALE, "%s", "vsnprintf_l()");
+  EXPECT_EQ(13, res);
+
+  EXPECT_DEATH(snprintf_l(buff, 10,
+                          _LIBCPP_GET_C_LOCALE, "%s", "snprintf_l()"),
+                "AddressSanitizer: stack-buffer-overflow");
+  EXPECT_DEATH(vsnprintf_l_wrapper(buff, 10,
+                                  _LIBCPP_GET_C_LOCALE, "%s", "vsnprintf_l()"),
+                "AddressSanitizer: stack-buffer-overflow");
+}
+#endif
diff --git a/contrib/compiler-rt/lib/builtins/atomic.c b/contrib/compiler-rt/lib/builtins/atomic.c
index 02429a653d2b..35c8837dcecf 100644
--- a/contrib/compiler-rt/lib/builtins/atomic.c
+++ b/contrib/compiler-rt/lib/builtins/atomic.c
@@ -28,20 +28,14 @@
 #include <stdint.h>
 #include <string.h>
 
+#include "assembly.h"
+
 // Clang objects if you redefine a builtin.  This little hack allows us to
 // define a function with the same name as an intrinsic.
-#if __APPLE__
-// mach-o has extra leading underscore
-#pragma redefine_extname __atomic_load_c ___atomic_load
-#pragma redefine_extname __atomic_store_c ___atomic_store
-#pragma redefine_extname __atomic_exchange_c ___atomic_exchange
-#pragma redefine_extname __atomic_compare_exchange_c ___atomic_compare_exchange
-#else
-#pragma redefine_extname __atomic_load_c __atomic_load
-#pragma redefine_extname __atomic_store_c __atomic_store
-#pragma redefine_extname __atomic_exchange_c __atomic_exchange
-#pragma redefine_extname __atomic_compare_exchange_c __atomic_compare_exchange
-#endif
+#pragma redefine_extname __atomic_load_c SYMBOL_NAME(__atomic_load)
+#pragma redefine_extname __atomic_store_c SYMBOL_NAME(__atomic_store)
+#pragma redefine_extname __atomic_exchange_c SYMBOL_NAME(__atomic_exchange)
+#pragma redefine_extname __atomic_compare_exchange_c SYMBOL_NAME(__atomic_compare_exchange)
 
 /// Number of locks.  This allocates one page on 32-bit platforms, two on
 /// 64-bit.  This can be specified externally if a different trade between
diff --git a/contrib/compiler-rt/lib/builtins/clear_cache.c b/contrib/compiler-rt/lib/builtins/clear_cache.c
index 4b46e8b3e9be..61b1e9bbb5c0 100644
--- a/contrib/compiler-rt/lib/builtins/clear_cache.c
+++ b/contrib/compiler-rt/lib/builtins/clear_cache.c
@@ -24,6 +24,51 @@
 
 #if defined(__ANDROID__) && defined(__mips__)
   #include <sys/cachectl.h>
+  #include <sys/syscall.h>
+  #ifdef __LP64__
+    /*
+     * clear_mips_cache - Invalidates instruction cache for Mips.
+     */
+    static void clear_mips_cache(const void* Addr, size_t Size) {
+      asm volatile (
+        ".set push\n"
+        ".set noreorder\n"
+        ".set noat\n"
+        "beq %[Size], $zero, 20f\n"          /* If size == 0, branch around. */
+        "nop\n"
+        "daddu %[Size], %[Addr], %[Size]\n"  /* Calculate end address + 1 */
+        "rdhwr $v0, $1\n"                    /* Get step size for SYNCI.
+                                                $1 is $HW_SYNCI_Step */
+        "beq $v0, $zero, 20f\n"              /* If no caches require
+                                                synchronization, branch
+                                                around. */
+        "nop\n"
+        "10:\n"
+        "synci 0(%[Addr])\n"                 /* Synchronize all caches around
+                                                address. */
+        "daddu %[Addr], %[Addr], $v0\n"      /* Add step size. */
+        "sltu $at, %[Addr], %[Size]\n"       /* Compare current with end
+                                                address. */
+        "bne $at, $zero, 10b\n"              /* Branch if more to do. */
+        "nop\n"
+        "sync\n"                             /* Clear memory hazards. */
+        "20:\n"
+        "bal 30f\n"
+        "nop\n"
+        "30:\n"
+        "daddiu $ra, $ra, 12\n"              /* $ra has a value of $pc here.
+                                                Add offset of 12 to point to the
+                                                instruction after the last nop.
+                                              */
+        "jr.hb $ra\n"                        /* Return, clearing instruction
+                                                hazards. */
+        "nop\n"
+        ".set pop\n"
+        : [Addr] "+r"(Addr), [Size] "+r"(Size)
+        :: "at", "ra", "v0", "memory"
+      );
+    }
+  #endif
 #endif
 
 #if defined(__ANDROID__) && defined(__arm__)
@@ -52,7 +97,7 @@ void __clear_cache(void *start, void *end) {
 
         sysarch(ARM_SYNC_ICACHE, &arg);
     #elif defined(__ANDROID__)
-         const register int start_reg __asm("r0") = (int) (intptr_t) start;
+         register int start_reg __asm("r0") = (int) (intptr_t) start;
          const register int end_reg __asm("r1") = (int) (intptr_t) end;
          const register int flags __asm("r2") = 0;
          const register int syscall_nr __asm("r7") = __ARM_NR_cacheflush;
@@ -67,7 +112,17 @@ void __clear_cache(void *start, void *end) {
 #elif defined(__ANDROID__) && defined(__mips__)
   const uintptr_t start_int = (uintptr_t) start;
   const uintptr_t end_int = (uintptr_t) end;
-  _flush_cache(start, (end_int - start_int), BCACHE);
+    #ifdef __LP64__
+        // Call synci implementation for short address range.
+        const uintptr_t address_range_limit = 256;
+        if ((end_int - start_int) <= address_range_limit) {
+            clear_mips_cache(start, (end_int - start_int));
+        } else {
+            syscall(__NR_cacheflush, start, (end_int - start_int), BCACHE);
+        }
+    #else
+        syscall(__NR_cacheflush, start, (end_int - start_int), BCACHE);
+    #endif
 #elif defined(__aarch64__) && !defined(__APPLE__)
   uint64_t xstart = (uint64_t)(uintptr_t) start;
   uint64_t xend = (uint64_t)(uintptr_t) end;
diff --git a/contrib/compiler-rt/lib/builtins/gcc_personality_v0.c b/contrib/compiler-rt/lib/builtins/gcc_personality_v0.c
index 869f4178e853..4b95cfd43b05 100644
--- a/contrib/compiler-rt/lib/builtins/gcc_personality_v0.c
+++ b/contrib/compiler-rt/lib/builtins/gcc_personality_v0.c
@@ -11,47 +11,7 @@
 
 #include "int_lib.h"
 
-/*
- * _Unwind_* stuff based on C++ ABI public documentation
- * http://refspecs.freestandards.org/abi-eh-1.21.html
- */
-
-typedef enum {
-    _URC_NO_REASON = 0,
-    _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
-    _URC_FATAL_PHASE2_ERROR = 2,
-    _URC_FATAL_PHASE1_ERROR = 3,
-    _URC_NORMAL_STOP = 4,
-    _URC_END_OF_STACK = 5,
-    _URC_HANDLER_FOUND = 6,
-    _URC_INSTALL_CONTEXT = 7,
-    _URC_CONTINUE_UNWIND = 8
-} _Unwind_Reason_Code;
-
-typedef enum {
-    _UA_SEARCH_PHASE = 1,
-    _UA_CLEANUP_PHASE = 2,
-    _UA_HANDLER_FRAME = 4,
-    _UA_FORCE_UNWIND = 8,
-    _UA_END_OF_STACK = 16
-} _Unwind_Action;
-
-typedef struct _Unwind_Context* _Unwind_Context_t;
-
-struct _Unwind_Exception {
-    uint64_t                exception_class;
-    void                    (*exception_cleanup)(_Unwind_Reason_Code reason, 
-                                                 struct _Unwind_Exception* exc);
-    uintptr_t                private_1;    
-    uintptr_t                private_2;    
-};
-
-COMPILER_RT_ABI  const uint8_t*    _Unwind_GetLanguageSpecificData(_Unwind_Context_t c);
-COMPILER_RT_ABI  void              _Unwind_SetGR(_Unwind_Context_t c, int i, uintptr_t n);
-COMPILER_RT_ABI  void              _Unwind_SetIP(_Unwind_Context_t, uintptr_t new_value);
-COMPILER_RT_ABI  uintptr_t         _Unwind_GetIP(_Unwind_Context_t context);
-COMPILER_RT_ABI  uintptr_t         _Unwind_GetRegionStart(_Unwind_Context_t context);
-
+#include <unwind.h>
 
 /*
  * Pointer encodings documented at:
@@ -185,12 +145,12 @@ static uintptr_t readEncodedPointer(const uint8_t** data, uint8_t encoding)
 COMPILER_RT_ABI _Unwind_Reason_Code
 __gcc_personality_sj0(int version, _Unwind_Action actions,
          uint64_t exceptionClass, struct _Unwind_Exception* exceptionObject,
-         _Unwind_Context_t context)
+         struct _Unwind_Context *context)
 #else
 COMPILER_RT_ABI _Unwind_Reason_Code
 __gcc_personality_v0(int version, _Unwind_Action actions,
          uint64_t exceptionClass, struct _Unwind_Exception* exceptionObject,
-         _Unwind_Context_t context)
+         struct _Unwind_Context *context)
 #endif
 {
     /* Since C does not have catch clauses, there is nothing to do during */
@@ -199,7 +159,7 @@ __gcc_personality_v0(int version, _Unwind_Action actions,
         return _URC_CONTINUE_UNWIND;
         
     /* There is nothing to do if there is no LSDA for this frame. */
-    const uint8_t* lsda = _Unwind_GetLanguageSpecificData(context);
+    const uint8_t* lsda = (uint8_t*)_Unwind_GetLanguageSpecificData(context);
     if ( lsda == (uint8_t*) 0 )
         return _URC_CONTINUE_UNWIND;
 
diff --git a/contrib/compiler-rt/lib/builtins/int_types.h b/contrib/compiler-rt/lib/builtins/int_types.h
index 5107f71550ac..aedae14b2046 100644
--- a/contrib/compiler-rt/lib/builtins/int_types.h
+++ b/contrib/compiler-rt/lib/builtins/int_types.h
@@ -56,7 +56,8 @@ typedef union
     }s;
 } udwords;
 
-#if __LP64__
+/* MIPS64 issue: PR 20098 */
+#if defined(__LP64__) && !(defined(__mips__) && defined(__clang__))
 #define CRT_HAS_128BIT
 #endif
 
diff --git a/contrib/compiler-rt/lib/dfsan/dfsan.cc b/contrib/compiler-rt/lib/dfsan/dfsan.cc
index 941edc5eba7a..dd0ea61142b8 100644
--- a/contrib/compiler-rt/lib/dfsan/dfsan.cc
+++ b/contrib/compiler-rt/lib/dfsan/dfsan.cc
@@ -22,6 +22,7 @@
 #include "sanitizer_common/sanitizer_atomic.h"
 #include "sanitizer_common/sanitizer_common.h"
 #include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_flag_parser.h"
 #include "sanitizer_common/sanitizer_libc.h"
 
 #include "dfsan/dfsan.h"
@@ -256,7 +257,7 @@ dfsan_read_label(const void *addr, uptr size) {
   return __dfsan_union_load(shadow_for(addr), size);
 }
 
-SANITIZER_INTERFACE_ATTRIBUTE
+extern "C" SANITIZER_INTERFACE_ATTRIBUTE
 const struct dfsan_label_info *dfsan_get_label_info(dfsan_label label) {
   return &__dfsan_label_info[label];
 }
@@ -310,16 +311,24 @@ dfsan_dump_labels(int fd) {
   }
 }
 
+void Flags::SetDefaults() {
+#define DFSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
+#include "dfsan_flags.inc"
+#undef DFSAN_FLAG
+}
+
+void RegisterDfsanFlags(FlagParser *parser, Flags *f) {
+#define DFSAN_FLAG(Type, Name, DefaultValue, Description) \
+  RegisterFlag(parser, #Name, Description, &f->Name);
+#include "dfsan_flags.inc"
+#undef DFSAN_FLAG
+}
+
 static void InitializeFlags(Flags &f, const char *env) {
-  f.warn_unimplemented = true;
-  f.warn_nonzero_labels = false;
-  f.strict_data_dependencies = true;
-  f.dump_labels_at_exit = "";
-
-  ParseFlag(env, &f.warn_unimplemented, "warn_unimplemented", "");
-  ParseFlag(env, &f.warn_nonzero_labels, "warn_nonzero_labels", "");
-  ParseFlag(env, &f.strict_data_dependencies, "strict_data_dependencies", "");
-  ParseFlag(env, &f.dump_labels_at_exit, "dump_labels_at_exit", "");
+  FlagParser parser;
+  RegisterDfsanFlags(&parser, &f);
+  f.SetDefaults();
+  parser.ParseString(env);
 }
 
 static void dfsan_fini() {
diff --git a/contrib/compiler-rt/lib/dfsan/dfsan.h b/contrib/compiler-rt/lib/dfsan/dfsan.h
index bc38be08c9cd..ceba3533a233 100644
--- a/contrib/compiler-rt/lib/dfsan/dfsan.h
+++ b/contrib/compiler-rt/lib/dfsan/dfsan.h
@@ -56,17 +56,11 @@ inline const dfsan_label *shadow_for(const void *ptr) {
 }
 
 struct Flags {
-  // Whether to warn on unimplemented functions.
-  bool warn_unimplemented;
-  // Whether to warn on non-zero labels.
-  bool warn_nonzero_labels;
-  // Whether to propagate labels only when there is an obvious data dependency
-  // (e.g., when comparing strings, ignore the fact that the output of the
-  // comparison might be data-dependent on the content of the strings). This
-  // applies only to the custom functions defined in 'custom.c'.
-  bool strict_data_dependencies;
-  // The path of the file where to dump the labels when the program terminates.
-  const char* dump_labels_at_exit;
+#define DFSAN_FLAG(Type, Name, DefaultValue, Description) Type Name;
+#include "dfsan_flags.inc"
+#undef DFSAN_FLAG
+
+  void SetDefaults();
 };
 
 extern Flags flags_data;
diff --git a/contrib/compiler-rt/lib/dfsan/dfsan_custom.cc b/contrib/compiler-rt/lib/dfsan/dfsan_custom.cc
index 839a399faae0..318ecd6fb317 100644
--- a/contrib/compiler-rt/lib/dfsan/dfsan_custom.cc
+++ b/contrib/compiler-rt/lib/dfsan/dfsan_custom.cc
@@ -314,11 +314,12 @@ static void unpoison(const void *ptr, uptr size) {
 SANITIZER_INTERFACE_ATTRIBUTE void *
 __dfsw_dlopen(const char *filename, int flag, dfsan_label filename_label,
               dfsan_label flag_label, dfsan_label *ret_label) {
-  link_map *map = (link_map *)dlopen(filename, flag);
+  void *handle = dlopen(filename, flag);
+  link_map *map = GET_LINK_MAP_BY_DLOPEN_HANDLE(handle);
   if (map)
     ForEachMappedRegion(map, unpoison);
   *ret_label = 0;
-  return (void *)map;
+  return handle;
 }
 
 struct pthread_create_info {
diff --git a/contrib/compiler-rt/lib/dfsan/dfsan_flags.inc b/contrib/compiler-rt/lib/dfsan/dfsan_flags.inc
new file mode 100644
index 000000000000..24fbfcb9e46f
--- /dev/null
+++ b/contrib/compiler-rt/lib/dfsan/dfsan_flags.inc
@@ -0,0 +1,32 @@
+//===-- dfsan_flags.inc -----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// DFSan runtime flags.
+//
+//===----------------------------------------------------------------------===//
+#ifndef DFSAN_FLAG
+# error "Define DFSAN_FLAG prior to including this file!"
+#endif
+
+// DFSAN_FLAG(Type, Name, DefaultValue, Description)
+// See COMMON_FLAG in sanitizer_flags.inc for more details.
+
+DFSAN_FLAG(bool, warn_unimplemented, true,
+           "Whether to warn on unimplemented functions.")
+DFSAN_FLAG(bool, warn_nonzero_labels, false,
+           "Whether to warn on unimplemented functions.")
+DFSAN_FLAG(
+    bool, strict_data_dependencies, true,
+    "Whether to propagate labels only when there is an obvious data dependency"
+    "(e.g., when comparing strings, ignore the fact that the output of the"
+    "comparison might be data-dependent on the content of the strings). This"
+    "applies only to the custom functions defined in 'custom.c'.")
+DFSAN_FLAG(const char *, dump_labels_at_exit, "", "The path of the file where "
+                                                  "to dump the labels when the "
+                                                  "program terminates.")
diff --git a/contrib/compiler-rt/lib/lsan/lsan.cc b/contrib/compiler-rt/lib/lsan/lsan.cc
index 1598fcac4a76..1509b2a7d342 100644
--- a/contrib/compiler-rt/lib/lsan/lsan.cc
+++ b/contrib/compiler-rt/lib/lsan/lsan.cc
@@ -52,6 +52,9 @@ extern "C" void __lsan_init() {
 
   if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit)
     Atexit(DoLeakCheck);
+
+  InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
+
   lsan_inited = true;
   lsan_init_is_running = false;
 }
diff --git a/contrib/compiler-rt/lib/lsan/lsan_allocator.cc b/contrib/compiler-rt/lib/lsan/lsan_allocator.cc
index 8be2a2ad9224..96a2b0428a61 100644
--- a/contrib/compiler-rt/lib/lsan/lsan_allocator.cc
+++ b/contrib/compiler-rt/lib/lsan/lsan_allocator.cc
@@ -47,7 +47,7 @@ static Allocator allocator;
 static THREADLOCAL AllocatorCache cache;
 
 void InitializeAllocator() {
-  allocator.Init();
+  allocator.InitLinkerInitialized(common_flags()->allocator_may_return_null);
 }
 
 void AllocatorThreadFinish() {
diff --git a/contrib/compiler-rt/lib/lsan/lsan_common.cc b/contrib/compiler-rt/lib/lsan/lsan_common.cc
index c2ba52e46911..7b3cd1639761 100644
--- a/contrib/compiler-rt/lib/lsan/lsan_common.cc
+++ b/contrib/compiler-rt/lib/lsan/lsan_common.cc
@@ -16,6 +16,7 @@
 
 #include "sanitizer_common/sanitizer_common.h"
 #include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_flag_parser.h"
 #include "sanitizer_common/sanitizer_placement_new.h"
 #include "sanitizer_common/sanitizer_procmaps.h"
 #include "sanitizer_common/sanitizer_stackdepot.h"
@@ -36,52 +37,50 @@ bool DisabledInThisThread() { return disable_counter > 0; }
 
 Flags lsan_flags;
 
+void Flags::SetDefaults() {
+#define LSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
+#include "lsan_flags.inc"
+#undef LSAN_FLAG
+}
+
+static void RegisterLsanFlags(FlagParser *parser, Flags *f) {
+#define LSAN_FLAG(Type, Name, DefaultValue, Description) \
+  RegisterFlag(parser, #Name, Description, &f->Name);
+#include "lsan_flags.inc"
+#undef LSAN_FLAG
+}
+
 static void InitializeFlags(bool standalone) {
   Flags *f = flags();
-  // Default values.
-  f->report_objects = false;
-  f->resolution = 0;
-  f->max_leaks = 0;
-  f->exitcode = 23;
-  f->use_registers = true;
-  f->use_globals = true;
-  f->use_stacks = true;
-  f->use_tls = true;
-  f->use_root_regions = true;
-  f->use_unaligned = false;
-  f->use_poisoned = false;
-  f->log_pointers = false;
-  f->log_threads = false;
+  FlagParser parser;
+  RegisterLsanFlags(&parser, f);
+  RegisterCommonFlags(&parser);
 
-  const char *options = GetEnv("LSAN_OPTIONS");
-  if (options) {
-    ParseFlag(options, &f->use_registers, "use_registers", "");
-    ParseFlag(options, &f->use_globals, "use_globals", "");
-    ParseFlag(options, &f->use_stacks, "use_stacks", "");
-    ParseFlag(options, &f->use_tls, "use_tls", "");
-    ParseFlag(options, &f->use_root_regions, "use_root_regions", "");
-    ParseFlag(options, &f->use_unaligned, "use_unaligned", "");
-    ParseFlag(options, &f->use_poisoned, "use_poisoned", "");
-    ParseFlag(options, &f->report_objects, "report_objects", "");
-    ParseFlag(options, &f->resolution, "resolution", "");
-    CHECK_GE(&f->resolution, 0);
-    ParseFlag(options, &f->max_leaks, "max_leaks", "");
-    CHECK_GE(&f->max_leaks, 0);
-    ParseFlag(options, &f->log_pointers, "log_pointers", "");
-    ParseFlag(options, &f->log_threads, "log_threads", "");
-    ParseFlag(options, &f->exitcode, "exitcode", "");
-  }
+  f->SetDefaults();
 
   // Set defaults for common flags (only in standalone mode) and parse
   // them from LSAN_OPTIONS.
-  CommonFlags *cf = common_flags();
   if (standalone) {
-    SetCommonFlagsDefaults(cf);
-    cf->external_symbolizer_path = GetEnv("LSAN_SYMBOLIZER_PATH");
-    cf->malloc_context_size = 30;
-    cf->detect_leaks = true;
+    SetCommonFlagsDefaults();
+    CommonFlags cf;
+    cf.CopyFrom(*common_flags());
+    cf.external_symbolizer_path = GetEnv("LSAN_SYMBOLIZER_PATH");
+    cf.malloc_context_size = 30;
+    cf.detect_leaks = true;
+    OverrideCommonFlags(cf);
   }
-  ParseCommonFlagsFromString(cf, options);
+
+  bool help_before = common_flags()->help;
+
+  const char *options = GetEnv("LSAN_OPTIONS");
+  parser.ParseString(options);
+
+  SetVerbosity(common_flags()->verbosity);
+
+  if (Verbosity()) ReportUnrecognizedFlags();
+
+  if (!help_before && common_flags()->help)
+    parser.PrintFlagDescriptions();
 }
 
 #define LOG_POINTERS(...)                           \
@@ -367,7 +366,7 @@ static void CollectLeaksCb(uptr chunk, void *arg) {
   LsanMetadata m(chunk);
   if (!m.allocated()) return;
   if (m.tag() == kDirectlyLeaked || m.tag() == kIndirectlyLeaked) {
-    uptr resolution = flags()->resolution;
+    u32 resolution = flags()->resolution;
     u32 stack_trace_id = 0;
     if (resolution > 0) {
       StackTrace stack = StackDepotGet(m.stack_trace_id());
diff --git a/contrib/compiler-rt/lib/lsan/lsan_common.h b/contrib/compiler-rt/lib/lsan/lsan_common.h
index 86ff12da6e0f..64cbef38c7a6 100644
--- a/contrib/compiler-rt/lib/lsan/lsan_common.h
+++ b/contrib/compiler-rt/lib/lsan/lsan_common.h
@@ -38,40 +38,14 @@ enum ChunkTag {
 };
 
 struct Flags {
+#define LSAN_FLAG(Type, Name, DefaultValue, Description) Type Name;
+#include "lsan_flags.inc"
+#undef LSAN_FLAG
+
+  void SetDefaults();
   uptr pointer_alignment() const {
     return use_unaligned ? 1 : sizeof(uptr);
   }
-
-  // Print addresses of leaked objects after main leak report.
-  bool report_objects;
-  // Aggregate two objects into one leak if this many stack frames match. If
-  // zero, the entire stack trace must match.
-  int resolution;
-  // The number of leaks reported.
-  int max_leaks;
-  // If nonzero kill the process with this exit code upon finding leaks.
-  int exitcode;
-
-  // Flags controlling the root set of reachable memory.
-  // Global variables (.data and .bss).
-  bool use_globals;
-  // Thread stacks.
-  bool use_stacks;
-  // Thread registers.
-  bool use_registers;
-  // TLS and thread-specific storage.
-  bool use_tls;
-  // Regions added via __lsan_register_root_region().
-  bool use_root_regions;
-
-  // Consider unaligned pointers valid.
-  bool use_unaligned;
-  // Consider pointers found in poisoned memory to be valid.
-  bool use_poisoned;
-
-  // Debug logging.
-  bool log_pointers;
-  bool log_threads;
 };
 
 extern Flags lsan_flags;
diff --git a/contrib/compiler-rt/lib/lsan/lsan_flags.inc b/contrib/compiler-rt/lib/lsan/lsan_flags.inc
new file mode 100644
index 000000000000..7f00acbf9119
--- /dev/null
+++ b/contrib/compiler-rt/lib/lsan/lsan_flags.inc
@@ -0,0 +1,44 @@
+//===-- lsan_flags.inc ------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// LSan runtime flags.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LSAN_FLAG
+# error "Define LSAN_FLAG prior to including this file!"
+#endif
+
+// LSAN_FLAG(Type, Name, DefaultValue, Description)
+// See COMMON_FLAG in sanitizer_flags.inc for more details.
+
+LSAN_FLAG(bool, report_objects, false,
+          "Print addresses of leaked objects after main leak report.")
+LSAN_FLAG(
+    int, resolution, 0,
+    "Aggregate two objects into one leak if this many stack frames match. If "
+    "zero, the entire stack trace must match.")
+LSAN_FLAG(int, max_leaks, 0, "The number of leaks reported.")
+LSAN_FLAG(int, exitcode, 23,
+          "If nonzero kill the process with this exit code upon finding leaks.")
+
+// Flags controlling the root set of reachable memory.
+LSAN_FLAG(bool, use_globals, true,
+          "Root set: include global variables (.data and .bss)")
+LSAN_FLAG(bool, use_stacks, true, "Root set: include thread stacks")
+LSAN_FLAG(bool, use_registers, true, "Root set: include thread registers")
+LSAN_FLAG(bool, use_tls, true,
+          "Root set: include TLS and thread-specific storage")
+LSAN_FLAG(bool, use_root_regions, true,
+          "Root set: include regions added via __lsan_register_root_region().")
+
+LSAN_FLAG(bool, use_unaligned, false, "Consider unaligned pointers valid.")
+LSAN_FLAG(bool, use_poisoned, false,
+          "Consider pointers found in poisoned memory to be valid.")
+LSAN_FLAG(bool, log_pointers, false, "Debug logging")
+LSAN_FLAG(bool, log_threads, false, "Debug logging")
diff --git a/contrib/compiler-rt/lib/msan/msan.cc b/contrib/compiler-rt/lib/msan/msan.cc
index 853e448fab8e..4adcc9eb8e6a 100644
--- a/contrib/compiler-rt/lib/msan/msan.cc
+++ b/contrib/compiler-rt/lib/msan/msan.cc
@@ -16,16 +16,17 @@
 #include "msan_chained_origin_depot.h"
 #include "msan_origin.h"
 #include "msan_thread.h"
+#include "msan_poisoning.h"
 #include "sanitizer_common/sanitizer_atomic.h"
 #include "sanitizer_common/sanitizer_common.h"
 #include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_flag_parser.h"
 #include "sanitizer_common/sanitizer_libc.h"
 #include "sanitizer_common/sanitizer_procmaps.h"
 #include "sanitizer_common/sanitizer_stacktrace.h"
 #include "sanitizer_common/sanitizer_symbolizer.h"
 #include "sanitizer_common/sanitizer_stackdepot.h"
 
-
 // ACHTUNG! No system header includes in this file.
 
 using namespace __sanitizer;
@@ -96,19 +97,78 @@ static const char *StackOriginDescr[kNumStackOriginDescrs];
 static uptr StackOriginPC[kNumStackOriginDescrs];
 static atomic_uint32_t NumStackOriginDescrs;
 
-static void ParseFlagsFromString(Flags *f, const char *str) {
-  CommonFlags *cf = common_flags();
-  ParseCommonFlagsFromString(cf, str);
-  ParseFlag(str, &f->poison_heap_with_zeroes, "poison_heap_with_zeroes", "");
-  ParseFlag(str, &f->poison_stack_with_zeroes, "poison_stack_with_zeroes", "");
-  ParseFlag(str, &f->poison_in_malloc, "poison_in_malloc", "");
-  ParseFlag(str, &f->poison_in_free, "poison_in_free", "");
-  ParseFlag(str, &f->exit_code, "exit_code", "");
+void Flags::SetDefaults() {
+#define MSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
+#include "msan_flags.inc"
+#undef MSAN_FLAG
+}
+
+// keep_going is an old name for halt_on_error,
+// and it has inverse meaning.
+class FlagHandlerKeepGoing : public FlagHandlerBase {
+  bool *halt_on_error_;
+
+ public:
+  explicit FlagHandlerKeepGoing(bool *halt_on_error)
+      : halt_on_error_(halt_on_error) {}
+  bool Parse(const char *value) {
+    bool tmp;
+    FlagHandler<bool> h(&tmp);
+    if (!h.Parse(value)) return false;
+    *halt_on_error_ = !tmp;
+    return true;
+  }
+};
+
+void RegisterMsanFlags(FlagParser *parser, Flags *f) {
+#define MSAN_FLAG(Type, Name, DefaultValue, Description) \
+  RegisterFlag(parser, #Name, Description, &f->Name);
+#include "msan_flags.inc"
+#undef MSAN_FLAG
+
+  FlagHandlerKeepGoing *fh_keep_going = new (FlagParser::Alloc)  // NOLINT
+      FlagHandlerKeepGoing(&f->halt_on_error);
+  parser->RegisterHandler("keep_going", fh_keep_going,
+                          "deprecated, use halt_on_error");
+}
+
+static void InitializeFlags(Flags *f, const char *options) {
+  FlagParser parser;
+  RegisterMsanFlags(&parser, f);
+  RegisterCommonFlags(&parser);
+
+  SetCommonFlagsDefaults();
+  {
+    CommonFlags cf;
+    cf.CopyFrom(*common_flags());
+    cf.external_symbolizer_path = GetEnv("MSAN_SYMBOLIZER_PATH");
+    cf.malloc_context_size = 20;
+    cf.handle_ioctl = true;
+    // FIXME: test and enable.
+    cf.check_printf = false;
+    cf.intercept_tls_get_addr = true;
+    OverrideCommonFlags(cf);
+  }
+
+  f->SetDefaults();
+
+  // Override from user-specified string.
+  if (__msan_default_options)
+    parser.ParseString(__msan_default_options());
+
+  parser.ParseString(options);
+
+  SetVerbosity(common_flags()->verbosity);
+
+  if (Verbosity()) ReportUnrecognizedFlags();
+
+  if (common_flags()->help) parser.PrintFlagDescriptions();
+
+  // Check flag values:
   if (f->exit_code < 0 || f->exit_code > 127) {
     Printf("Exit code not in [0, 128) range: %d\n", f->exit_code);
     Die();
   }
-  ParseFlag(str, &f->origin_history_size, "origin_history_size", "");
   if (f->origin_history_size < 0 ||
       f->origin_history_size > Origin::kMaxDepth) {
     Printf(
@@ -117,8 +177,6 @@ static void ParseFlagsFromString(Flags *f, const char *str) {
         f->origin_history_size, Origin::kMaxDepth);
     Die();
   }
-  ParseFlag(str, &f->origin_history_per_stack_limit,
-            "origin_history_per_stack_limit", "");
   // Limiting to kStackDepotMaxUseCount / 2 to avoid overflow in
   // StackDepotHandle::inc_use_count_unsafe.
   if (f->origin_history_per_stack_limit < 0 ||
@@ -129,51 +187,7 @@ static void ParseFlagsFromString(Flags *f, const char *str) {
         f->origin_history_per_stack_limit, kStackDepotMaxUseCount / 2);
     Die();
   }
-
-  ParseFlag(str, &f->report_umrs, "report_umrs", "");
-  ParseFlag(str, &f->wrap_signals, "wrap_signals", "");
-  ParseFlag(str, &f->print_stats, "print_stats", "");
-  ParseFlag(str, &f->atexit, "atexit", "");
-  ParseFlag(str, &f->store_context_size, "store_context_size", "");
   if (f->store_context_size < 1) f->store_context_size = 1;
-
-  // keep_going is an old name for halt_on_error,
-  // and it has inverse meaning.
-  f->halt_on_error = !f->halt_on_error;
-  ParseFlag(str, &f->halt_on_error, "keep_going", "");
-  f->halt_on_error = !f->halt_on_error;
-  ParseFlag(str, &f->halt_on_error, "halt_on_error", "");
-}
-
-static void InitializeFlags(Flags *f, const char *options) {
-  CommonFlags *cf = common_flags();
-  SetCommonFlagsDefaults(cf);
-  cf->external_symbolizer_path = GetEnv("MSAN_SYMBOLIZER_PATH");
-  cf->malloc_context_size = 20;
-  cf->handle_ioctl = true;
-  // FIXME: test and enable.
-  cf->check_printf = false;
-  cf->intercept_tls_get_addr = true;
-
-  internal_memset(f, 0, sizeof(*f));
-  f->poison_heap_with_zeroes = false;
-  f->poison_stack_with_zeroes = false;
-  f->poison_in_malloc = true;
-  f->poison_in_free = true;
-  f->exit_code = 77;
-  f->origin_history_size = Origin::kMaxDepth;
-  f->origin_history_per_stack_limit = 20000;
-  f->report_umrs = true;
-  f->wrap_signals = true;
-  f->print_stats = false;
-  f->atexit = false;
-  f->halt_on_error = !&__msan_keep_going;
-  f->store_context_size = 20;
-
-  // Override from user-specified string.
-  if (__msan_default_options)
-    ParseFlagsFromString(f, __msan_default_options());
-  ParseFlagsFromString(f, options);
 }
 
 void GetStackTrace(BufferedStackTrace *stack, uptr max_s, uptr pc, uptr bp,
@@ -259,6 +273,7 @@ u32 ChainOrigin(u32 id, StackTrace *stack) {
     return id;
 
   Origin o = Origin::FromRawId(id);
+  stack->tag = StackTrace::TAG_UNKNOWN;
   Origin chained = Origin::CreateChainedOrigin(o, stack);
   return chained.raw_id();
 }
@@ -338,7 +353,6 @@ void __msan_init() {
 
   const char *msan_options = GetEnv("MSAN_OPTIONS");
   InitializeFlags(&msan_flags, msan_options);
-  if (common_flags()->help) PrintFlagDescriptions();
   __sanitizer_set_report_path(common_flags()->log_path);
 
   InitializeInterceptors();
@@ -372,10 +386,7 @@ void __msan_init() {
 
   Symbolizer::GetOrInit()->AddHooks(EnterSymbolizer, ExitSymbolizer);
 
-  if (common_flags()->coverage) {
-    __sanitizer_cov_init();
-    Atexit(__sanitizer_cov_dump);
-  }
+  InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
 
   MsanTSDInit(MsanTSDDtor);
 
@@ -485,24 +496,7 @@ void __msan_load_unpoisoned(void *src, uptr size, void *dst) {
 }
 
 void __msan_set_origin(const void *a, uptr size, u32 origin) {
-  // Origin mapping is 4 bytes per 4 bytes of application memory.
-  // Here we extend the range such that its left and right bounds are both
-  // 4 byte aligned.
-  if (!__msan_get_track_origins()) return;
-  uptr x = MEM_TO_ORIGIN((uptr)a);
-  uptr beg = x & ~3UL;  // align down.
-  uptr end = (x + size + 3) & ~3UL;  // align up.
-  u64 origin64 = ((u64)origin << 32) | origin;
-  // This is like memset, but the value is 32-bit. We unroll by 2 to write
-  // 64 bits at once. May want to unroll further to get 128-bit stores.
-  if (beg & 7ULL) {
-    *(u32*)beg = origin;
-    beg += 4;
-  }
-  for (uptr addr = beg; addr < (end & ~7UL); addr += 8)
-    *(u64*)addr = origin64;
-  if (end & 7ULL)
-    *(u32*)(end - 4) = origin;
+  if (__msan_get_track_origins()) SetOrigin(a, size, origin);
 }
 
 // 'descr' is created at compile time and contains '----' in the beginning.
diff --git a/contrib/compiler-rt/lib/msan/msan.h b/contrib/compiler-rt/lib/msan/msan.h
index 9bc1e4c6a447..ed18f21d0282 100644
--- a/contrib/compiler-rt/lib/msan/msan.h
+++ b/contrib/compiler-rt/lib/msan/msan.h
@@ -25,90 +25,90 @@
 # define MSAN_REPLACE_OPERATORS_NEW_AND_DELETE 1
 #endif
 
-/*
-C/C++ on FreeBSD
-0000 0000 0000 - 00ff ffff ffff: Low memory: main binary, MAP_32BIT mappings and modules
-0100 0000 0000 - 0fff ffff ffff: Bad1
-1000 0000 0000 - 30ff ffff ffff: Shadow
-3100 0000 0000 - 37ff ffff ffff: Bad2
-3800 0000 0000 - 58ff ffff ffff: Origins
-5900 0000 0000 - 5fff ffff ffff: Bad3
-6000 0000 0000 - 7fff ffff ffff: High memory: heap, modules and main thread stack
-
-C/C++ on Linux/PIE
-0000 0000 0000 - 1fff ffff ffff: Bad1
-2000 0000 0000 - 3fff ffff ffff: Shadow
-4000 0000 0000 - 5fff ffff ffff: Origins
-6000 0000 0000 - 7fff ffff ffff: Main memory
-
-C/C++ on Mips
-0000 0000 0000 - 009f ffff ffff: Bad1
-00a0 0000 0000 - 00bf ffff ffff: Shadow
-00c0 0000 0000 - 00df ffff ffff: Origins
-00e0 0000 0000 - 00ff ffff ffff: Main memory
-*/
+struct MappingDesc {
+  uptr start;
+  uptr end;
+  enum Type {
+    INVALID, APP, SHADOW, ORIGIN
+  } type;
+  const char *name;
+};
+
 
 #if SANITIZER_LINUX && defined(__mips64)
-const uptr kLowMemBeg   = 0;
-const uptr kLowMemSize  = 0;
-const uptr kHighMemBeg  = 0x00e000000000;
-const uptr kHighMemSize = 0x002000000000;
-const uptr kShadowBeg   = 0x00a000000000;
-const uptr kShadowSize  = 0x002000000000;
-const uptr kOriginsBeg  = 0x00c000000000;
-# define MEM_TO_SHADOW(mem) (((uptr)(mem)) & ~0x4000000000ULL)
+
+// Everything is above 0x00e000000000.
+const MappingDesc kMemoryLayout[] = {
+    {0x000000000000ULL, 0x00a000000000ULL, MappingDesc::INVALID, "invalid"},
+    {0x00a000000000ULL, 0x00c000000000ULL, MappingDesc::SHADOW, "shadow"},
+    {0x00c000000000ULL, 0x00e000000000ULL, MappingDesc::ORIGIN, "origin"},
+    {0x00e000000000ULL, 0x010000000000ULL, MappingDesc::APP, "app"}};
+
+#define MEM_TO_SHADOW(mem) (((uptr)(mem)) & ~0x4000000000ULL)
+#define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x002000000000)
+
 #elif SANITIZER_FREEBSD && SANITIZER_WORDSIZE == 64
-const uptr kLowMemBeg   = 0x000000000000;
-const uptr kLowMemSize  = 0x010000000000;
-const uptr kHighMemBeg  = 0x600000000000;
-const uptr kHighMemSize = 0x200000000000;
-const uptr kShadowBeg   = 0x100000000000;
-const uptr kShadowSize  = 0x210000000000;
-const uptr kOriginsBeg  = 0x380000000000;
+
+// Low memory: main binary, MAP_32BIT mappings and modules
+// High memory: heap, modules and main thread stack
+const MappingDesc kMemoryLayout[] = {
+    {0x000000000000ULL, 0x010000000000ULL, MappingDesc::APP, "low memory"},
+    {0x010000000000ULL, 0x100000000000ULL, MappingDesc::INVALID, "invalid"},
+    {0x100000000000ULL, 0x310000000000ULL, MappingDesc::SHADOW, "shadow"},
+    {0x310000000000ULL, 0x380000000000ULL, MappingDesc::INVALID, "invalid"},
+    {0x380000000000ULL, 0x590000000000ULL, MappingDesc::ORIGIN, "origin"},
+    {0x590000000000ULL, 0x600000000000ULL, MappingDesc::INVALID, "invalid"},
+    {0x600000000000ULL, 0x800000000000ULL, MappingDesc::APP, "high memory"}};
+
 // Maps low and high app ranges to contiguous space with zero base:
 //   Low:  0000 0000 0000 - 00ff ffff ffff  ->  2000 0000 0000 - 20ff ffff ffff
 //   High: 6000 0000 0000 - 7fff ffff ffff  ->  0000 0000 0000 - 1fff ffff ffff
-# define LINEARIZE_MEM(mem) \
-    (((uptr)(mem) & ~0xc00000000000ULL) ^ 0x200000000000ULL)
-# define MEM_TO_SHADOW(mem) (LINEARIZE_MEM((mem)) + 0x100000000000ULL)
-#elif SANITIZER_LINUX && SANITIZER_WORDSIZE == 64
-const uptr kLowMemBeg   = 0;
-const uptr kLowMemSize  = 0;
-const uptr kHighMemBeg  = 0x600000000000;
-const uptr kHighMemSize = 0x200000000000;
-const uptr kShadowBeg   = 0x200000000000;
-const uptr kShadowSize  = 0x200000000000;
-const uptr kOriginsBeg  = 0x400000000000;
-# define MEM_TO_SHADOW(mem) (((uptr)(mem)) & ~0x400000000000ULL)
-#else
-#error "Unsupported platform"
-#endif
+#define LINEARIZE_MEM(mem) \
+  (((uptr)(mem) & ~0xc00000000000ULL) ^ 0x200000000000ULL)
+#define MEM_TO_SHADOW(mem) (LINEARIZE_MEM((mem)) + 0x100000000000ULL)
+#define SHADOW_TO_ORIGIN(shadow) (((uptr)(shadow)) + 0x280000000000)
 
-const uptr kBad1Beg  = kLowMemBeg + kLowMemSize;
-const uptr kBad1Size = kShadowBeg - kBad1Beg;
+#elif SANITIZER_LINUX && SANITIZER_WORDSIZE == 64
 
-const uptr kBad2Beg  = kShadowBeg + kShadowSize;
-const uptr kBad2Size = kOriginsBeg - kBad2Beg;
+// Requries PIE binary and ASLR enabled.
+// Main thread stack and DSOs at 0x7f0000000000 (sometimes 0x7e0000000000).
+// Heap at 0x600000000000.
+const MappingDesc kMemoryLayout[] = {
+    {0x000000000000ULL, 0x200000000000ULL, MappingDesc::INVALID, "invalid"},
+    {0x200000000000ULL, 0x400000000000ULL, MappingDesc::SHADOW, "shadow"},
+    {0x400000000000ULL, 0x600000000000ULL, MappingDesc::ORIGIN, "origin"},
+    {0x600000000000ULL, 0x800000000000ULL, MappingDesc::APP, "app"}};
 
-const uptr kOriginsSize = kShadowSize;
+#define MEM_TO_SHADOW(mem) (((uptr)(mem)) & ~0x400000000000ULL)
+#define SHADOW_TO_ORIGIN(mem) (((uptr)(mem)) + 0x200000000000ULL)
 
-const uptr kBad3Beg  = kOriginsBeg + kOriginsSize;
-const uptr kBad3Size = kHighMemBeg - kBad3Beg;
+#else
+#error "Unsupported platform"
+#endif
 
-#define SHADOW_TO_ORIGIN(shadow) \
-  (((uptr)(shadow)) + (kOriginsBeg - kShadowBeg))
+const uptr kMemoryLayoutSize = sizeof(kMemoryLayout) / sizeof(kMemoryLayout[0]);
 
 #define MEM_TO_ORIGIN(mem) (SHADOW_TO_ORIGIN(MEM_TO_SHADOW((mem))))
 
-#define MEM_IS_APP(mem) \
-  ((kLowMemSize > 0 && (uptr)(mem) < kLowMemSize) || \
-    (uptr)(mem) >= kHighMemBeg)
-
-#define MEM_IS_SHADOW(mem) \
-  ((uptr)(mem) >= kShadowBeg && (uptr)(mem) < kShadowBeg + kShadowSize)
+#ifndef __clang__
+__attribute__((optimize("unroll-loops")))
+#endif
+inline bool addr_is_type(uptr addr, MappingDesc::Type mapping_type) {
+// It is critical for performance that this loop is unrolled (because then it is
+// simplified into just a few constant comparisons).
+#ifdef __clang__
+#pragma unroll
+#endif
+  for (unsigned i = 0; i < kMemoryLayoutSize; ++i)
+    if (kMemoryLayout[i].type == mapping_type &&
+        addr >= kMemoryLayout[i].start && addr < kMemoryLayout[i].end)
+      return true;
+  return false;
+}
 
-#define MEM_IS_ORIGIN(mem) \
-  ((uptr)(mem) >= kOriginsBeg && (uptr)(mem) < kOriginsBeg + kOriginsSize)
+#define MEM_IS_APP(mem) addr_is_type((uptr)(mem), MappingDesc::APP)
+#define MEM_IS_SHADOW(mem) addr_is_type((uptr)(mem), MappingDesc::SHADOW)
+#define MEM_IS_ORIGIN(mem) addr_is_type((uptr)(mem), MappingDesc::ORIGIN)
 
 // These constants must be kept in sync with the ones in MemorySanitizer.cc.
 const int kMsanParamTlsSize = 800;
@@ -125,6 +125,7 @@ char *GetProcSelfMaps();
 void InitializeInterceptors();
 
 void MsanAllocatorThreadFinish();
+void *MsanCalloc(StackTrace *stack, uptr nmemb, uptr size);
 void *MsanReallocate(StackTrace *stack, void *oldp, uptr size,
                      uptr alignment, bool zeroise);
 void MsanDeallocate(StackTrace *stack, void *ptr);
@@ -162,16 +163,12 @@ void ReportUMRInsideAddressRange(const char *what, const void *start, uptr size,
 void UnpoisonParam(uptr n);
 void UnpoisonThreadLocalState();
 
-u32 GetOriginIfPoisoned(uptr a, uptr size);
-void SetOriginIfPoisoned(uptr addr, uptr src_shadow, uptr size, u32 src_origin);
-void CopyOrigin(void *dst, const void *src, uptr size, StackTrace *stack);
-void MovePoison(void *dst, const void *src, uptr size, StackTrace *stack);
-void CopyPoison(void *dst, const void *src, uptr size, StackTrace *stack);
-
 // Returns a "chained" origin id, pointing to the given stack trace followed by
 // the previous origin id.
 u32 ChainOrigin(u32 id, StackTrace *stack);
 
+const int STACK_TRACE_TAG_POISON = StackTrace::TAG_CUSTOM + 1;
+
 #define GET_MALLOC_STACK_TRACE                                                 \
   BufferedStackTrace stack;                                                    \
   if (__msan_get_track_origins() && msan_inited)                               \
diff --git a/contrib/compiler-rt/lib/msan/msan_allocator.cc b/contrib/compiler-rt/lib/msan/msan_allocator.cc
index f21d71409ce2..698b6cddd30b 100644
--- a/contrib/compiler-rt/lib/msan/msan_allocator.cc
+++ b/contrib/compiler-rt/lib/msan/msan_allocator.cc
@@ -18,6 +18,7 @@
 #include "msan_allocator.h"
 #include "msan_origin.h"
 #include "msan_thread.h"
+#include "msan_poisoning.h"
 
 namespace __msan {
 
@@ -73,7 +74,7 @@ static inline void Init() {
   if (inited) return;
   __msan_init();
   inited = true;  // this must happen before any threads are created.
-  allocator.Init();
+  allocator.Init(common_flags()->allocator_may_return_null);
 }
 
 AllocatorCache *GetAllocatorCache(MsanThreadLocalMallocStorage *ms) {
@@ -92,7 +93,7 @@ static void *MsanAllocate(StackTrace *stack, uptr size, uptr alignment,
   if (size > kMaxAllowedMallocSize) {
     Report("WARNING: MemorySanitizer failed to allocate %p bytes\n",
            (void *)size);
-    return AllocatorReturnNull();
+    return allocator.ReturnNullOrDie();
   }
   MsanThread *t = GetCurrentThread();
   void *allocated;
@@ -112,6 +113,7 @@ static void *MsanAllocate(StackTrace *stack, uptr size, uptr alignment,
   } else if (flags()->poison_in_malloc) {
     __msan_poison(allocated, size);
     if (__msan_get_track_origins()) {
+      stack->tag = StackTrace::TAG_ALLOC;
       Origin o = Origin::CreateHeapOrigin(stack);
       __msan_set_origin(allocated, size, o.raw_id());
     }
@@ -132,6 +134,7 @@ void MsanDeallocate(StackTrace *stack, void *p) {
   if (flags()->poison_in_free) {
     __msan_poison(p, size);
     if (__msan_get_track_origins()) {
+      stack->tag = StackTrace::TAG_DEALLOC;
       Origin o = Origin::CreateHeapOrigin(stack);
       __msan_set_origin(p, size, o.raw_id());
     }
@@ -147,6 +150,13 @@ void MsanDeallocate(StackTrace *stack, void *p) {
   }
 }
 
+void *MsanCalloc(StackTrace *stack, uptr nmemb, uptr size) {
+  Init();
+  if (CallocShouldReturnNullDueToOverflow(size, nmemb))
+    return allocator.ReturnNullOrDie();
+  return MsanReallocate(stack, 0, nmemb * size, sizeof(u64), true);
+}
+
 void *MsanReallocate(StackTrace *stack, void *old_p, uptr new_size,
                      uptr alignment, bool zeroise) {
   if (!old_p)
@@ -161,15 +171,22 @@ void *MsanReallocate(StackTrace *stack, void *old_p, uptr new_size,
   if (new_size <= actually_allocated_size) {
     // We are not reallocating here.
     meta->requested_size = new_size;
-    if (new_size > old_size)
-      __msan_poison((char*)old_p + old_size, new_size - old_size);
+    if (new_size > old_size) {
+      if (zeroise) {
+        __msan_clear_and_unpoison((char *)old_p + old_size,
+                                  new_size - old_size);
+      } else if (flags()->poison_in_malloc) {
+        stack->tag = StackTrace::TAG_ALLOC;
+        PoisonMemory((char *)old_p + old_size, new_size - old_size, stack);
+      }
+    }
     return old_p;
   }
   uptr memcpy_size = Min(new_size, old_size);
   void *new_p = MsanAllocate(stack, new_size, alignment, zeroise);
   // Printf("realloc: old_size %zd new_size %zd\n", old_size, new_size);
   if (new_p) {
-    __msan_memcpy(new_p, old_p, memcpy_size);
+    CopyMemory(new_p, old_p, memcpy_size, stack);
     MsanDeallocate(stack, old_p);
   }
   return new_p;
diff --git a/contrib/compiler-rt/lib/msan/msan_flags.h b/contrib/compiler-rt/lib/msan/msan_flags.h
index 9b93f118a985..4fc6d172a04a 100644
--- a/contrib/compiler-rt/lib/msan/msan_flags.h
+++ b/contrib/compiler-rt/lib/msan/msan_flags.h
@@ -9,28 +9,18 @@
 //
 // This file is a part of MemorySanitizer.
 //
-// MemorySanitizer allocator.
 //===----------------------------------------------------------------------===//
 #ifndef MSAN_FLAGS_H
 #define MSAN_FLAGS_H
 
 namespace __msan {
 
-// Flags.
 struct Flags {
-  int exit_code;
-  int origin_history_size;
-  int origin_history_per_stack_limit;
-  bool poison_heap_with_zeroes;  // default: false
-  bool poison_stack_with_zeroes;  // default: false
-  bool poison_in_malloc;  // default: true
-  bool poison_in_free;  // default: true
-  bool report_umrs;
-  bool wrap_signals;
-  bool print_stats;
-  bool halt_on_error;
-  bool atexit;
-  int store_context_size; // like malloc_context_size, but for uninit stores
+#define MSAN_FLAG(Type, Name, DefaultValue, Description) Type Name;
+#include "msan_flags.inc"
+#undef MSAN_FLAG
+
+  void SetDefaults();
 };
 
 Flags *flags();
diff --git a/contrib/compiler-rt/lib/msan/msan_flags.inc b/contrib/compiler-rt/lib/msan/msan_flags.inc
new file mode 100644
index 000000000000..cb58ffc4aba7
--- /dev/null
+++ b/contrib/compiler-rt/lib/msan/msan_flags.inc
@@ -0,0 +1,33 @@
+//===-- msan_flags.inc ------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// MSan runtime flags.
+//
+//===----------------------------------------------------------------------===//
+#ifndef MSAN_FLAG
+# error "Define MSAN_FLAG prior to including this file!"
+#endif
+
+// MSAN_FLAG(Type, Name, DefaultValue, Description)
+// See COMMON_FLAG in sanitizer_flags.inc for more details.
+
+MSAN_FLAG(int, exit_code, 77, "")
+MSAN_FLAG(int, origin_history_size, Origin::kMaxDepth, "")
+MSAN_FLAG(int, origin_history_per_stack_limit, 20000, "")
+MSAN_FLAG(bool, poison_heap_with_zeroes, false, "")
+MSAN_FLAG(bool, poison_stack_with_zeroes, false, "")
+MSAN_FLAG(bool, poison_in_malloc, true, "")
+MSAN_FLAG(bool, poison_in_free, true, "")
+MSAN_FLAG(bool, report_umrs, true, "")
+MSAN_FLAG(bool, wrap_signals, true, "")
+MSAN_FLAG(bool, print_stats, false, "")
+MSAN_FLAG(bool, halt_on_error, !&__msan_keep_going, "")
+MSAN_FLAG(bool, atexit, false, "")
+MSAN_FLAG(int, store_context_size, 20,
+          "Like malloc_context_size, but for uninit stores.")
diff --git a/contrib/compiler-rt/lib/msan/msan_interceptors.cc b/contrib/compiler-rt/lib/msan/msan_interceptors.cc
index bbdf18e162a3..4a243941b8a3 100644
--- a/contrib/compiler-rt/lib/msan/msan_interceptors.cc
+++ b/contrib/compiler-rt/lib/msan/msan_interceptors.cc
@@ -20,6 +20,7 @@
 #include "msan_chained_origin_depot.h"
 #include "msan_origin.h"
 #include "msan_thread.h"
+#include "msan_poisoning.h"
 #include "sanitizer_common/sanitizer_platform_limits_posix.h"
 #include "sanitizer_common/sanitizer_allocator.h"
 #include "sanitizer_common/sanitizer_allocator_interface.h"
@@ -290,7 +291,7 @@ INTERCEPTOR(char *, strcpy, char *dest, const char *src) {  // NOLINT
   GET_STORE_STACK_TRACE;
   SIZE_T n = REAL(strlen)(src);
   char *res = REAL(strcpy)(dest, src);  // NOLINT
-  CopyPoison(dest, src, n + 1, &stack);
+  CopyShadowAndOrigin(dest, src, n + 1, &stack);
   return res;
 }
 
@@ -301,7 +302,7 @@ INTERCEPTOR(char *, strncpy, char *dest, const char *src, SIZE_T n) {  // NOLINT
   if (copy_size < n)
     copy_size++;  // trailing \0
   char *res = REAL(strncpy)(dest, src, n);  // NOLINT
-  CopyPoison(dest, src, copy_size, &stack);
+  CopyShadowAndOrigin(dest, src, copy_size, &stack);
   __msan_unpoison(dest + copy_size, n - copy_size);
   return res;
 }
@@ -311,16 +312,18 @@ INTERCEPTOR(char *, stpcpy, char *dest, const char *src) {  // NOLINT
   GET_STORE_STACK_TRACE;
   SIZE_T n = REAL(strlen)(src);
   char *res = REAL(stpcpy)(dest, src);  // NOLINT
-  CopyPoison(dest, src, n + 1, &stack);
+  CopyShadowAndOrigin(dest, src, n + 1, &stack);
   return res;
 }
 
 INTERCEPTOR(char *, strdup, char *src) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
+  // On FreeBSD strdup() leverages strlen().
+  InterceptorScope interceptor_scope;
   SIZE_T n = REAL(strlen)(src);
   char *res = REAL(strdup)(src);
-  CopyPoison(res, src, n + 1, &stack);
+  CopyShadowAndOrigin(res, src, n + 1, &stack);
   return res;
 }
 
@@ -330,7 +333,7 @@ INTERCEPTOR(char *, __strdup, char *src) {
   GET_STORE_STACK_TRACE;
   SIZE_T n = REAL(strlen)(src);
   char *res = REAL(__strdup)(src);
-  CopyPoison(res, src, n + 1, &stack);
+  CopyShadowAndOrigin(res, src, n + 1, &stack);
   return res;
 }
 #define MSAN_MAYBE_INTERCEPT___STRDUP INTERCEPT_FUNCTION(__strdup)
@@ -341,9 +344,11 @@ INTERCEPTOR(char *, __strdup, char *src) {
 INTERCEPTOR(char *, strndup, char *src, SIZE_T n) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
+  // On FreeBSD strndup() leverages strnlen().
+  InterceptorScope interceptor_scope;
   SIZE_T copy_size = REAL(strnlen)(src, n);
   char *res = REAL(strndup)(src, n);
-  CopyPoison(res, src, copy_size, &stack);
+  CopyShadowAndOrigin(res, src, copy_size, &stack);
   __msan_unpoison(res + copy_size, 1); // \0
   return res;
 }
@@ -354,7 +359,7 @@ INTERCEPTOR(char *, __strndup, char *src, SIZE_T n) {
   GET_STORE_STACK_TRACE;
   SIZE_T copy_size = REAL(strnlen)(src, n);
   char *res = REAL(__strndup)(src, n);
-  CopyPoison(res, src, copy_size, &stack);
+  CopyShadowAndOrigin(res, src, copy_size, &stack);
   __msan_unpoison(res + copy_size, 1); // \0
   return res;
 }
@@ -377,7 +382,7 @@ INTERCEPTOR(char *, strcat, char *dest, const char *src) {  // NOLINT
   SIZE_T src_size = REAL(strlen)(src);
   SIZE_T dest_size = REAL(strlen)(dest);
   char *res = REAL(strcat)(dest, src);  // NOLINT
-  CopyPoison(dest + dest_size, src, src_size + 1, &stack);
+  CopyShadowAndOrigin(dest + dest_size, src, src_size + 1, &stack);
   return res;
 }
 
@@ -387,7 +392,7 @@ INTERCEPTOR(char *, strncat, char *dest, const char *src, SIZE_T n) {  // NOLINT
   SIZE_T dest_size = REAL(strlen)(dest);
   SIZE_T copy_size = REAL(strnlen)(src, n);
   char *res = REAL(strncat)(dest, src, n);  // NOLINT
-  CopyPoison(dest + dest_size, src, copy_size, &stack);
+  CopyShadowAndOrigin(dest + dest_size, src, copy_size, &stack);
   __msan_unpoison(dest + dest_size + copy_size, 1); // \0
   return res;
 }
@@ -576,7 +581,8 @@ INTERCEPTOR(wchar_t *, wcscpy, wchar_t *dest, const wchar_t *src) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
   wchar_t *res = REAL(wcscpy)(dest, src);
-  CopyPoison(dest, src, sizeof(wchar_t) * (REAL(wcslen)(src) + 1), &stack);
+  CopyShadowAndOrigin(dest, src, sizeof(wchar_t) * (REAL(wcslen)(src) + 1),
+                      &stack);
   return res;
 }
 
@@ -585,7 +591,7 @@ INTERCEPTOR(wchar_t *, wmemcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
   wchar_t *res = REAL(wmemcpy)(dest, src, n);
-  CopyPoison(dest, src, n * sizeof(wchar_t), &stack);
+  CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
   return res;
 }
 
@@ -593,7 +599,7 @@ INTERCEPTOR(wchar_t *, wmempcpy, wchar_t *dest, const wchar_t *src, SIZE_T n) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
   wchar_t *res = REAL(wmempcpy)(dest, src, n);
-  CopyPoison(dest, src, n * sizeof(wchar_t), &stack);
+  CopyShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
   return res;
 }
 
@@ -609,7 +615,7 @@ INTERCEPTOR(wchar_t *, wmemmove, wchar_t *dest, const wchar_t *src, SIZE_T n) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
   wchar_t *res = REAL(wmemmove)(dest, src, n);
-  MovePoison(dest, src, n * sizeof(wchar_t), &stack);
+  MoveShadowAndOrigin(dest, src, n * sizeof(wchar_t), &stack);
   return res;
 }
 
@@ -699,7 +705,15 @@ INTERCEPTOR(int, __fxstat64, int magic, int fd, void *buf) {
 #define MSAN_MAYBE_INTERCEPT___FXSTAT64
 #endif
 
-#if !SANITIZER_FREEBSD
+#if SANITIZER_FREEBSD
+INTERCEPTOR(int, fstatat, int fd, char *pathname, void *buf, int flags) {
+  ENSURE_MSAN_INITED();
+  int res = REAL(fstatat)(fd, pathname, buf, flags);
+  if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
+  return res;
+}
+# define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(fstatat)
+#else
 INTERCEPTOR(int, __fxstatat, int magic, int fd, char *pathname, void *buf,
             int flags) {
   ENSURE_MSAN_INITED();
@@ -707,9 +721,7 @@ INTERCEPTOR(int, __fxstatat, int magic, int fd, char *pathname, void *buf,
   if (!res) __msan_unpoison(buf, __sanitizer::struct_stat_sz);
   return res;
 }
-#define MSAN_MAYBE_INTERCEPT___FXSTATAT INTERCEPT_FUNCTION(__fxstatat)
-#else
-#define MSAN_MAYBE_INTERCEPT___FXSTATAT
+# define MSAN_INTERCEPT_FSTATAT INTERCEPT_FUNCTION(__fxstatat)
 #endif
 
 #if !SANITIZER_FREEBSD
@@ -725,7 +737,16 @@ INTERCEPTOR(int, __fxstatat64, int magic, int fd, char *pathname, void *buf,
 #define MSAN_MAYBE_INTERCEPT___FXSTATAT64
 #endif
 
-#if !SANITIZER_FREEBSD
+#if SANITIZER_FREEBSD
+INTERCEPTOR(int, stat, char *path, void *buf) {
+  ENSURE_MSAN_INITED();
+  int res = REAL(stat)(path, buf);
+  if (!res)
+    __msan_unpoison(buf, __sanitizer::struct_stat_sz);
+  return res;
+}
+# define MSAN_INTERCEPT_STAT INTERCEPT_FUNCTION(stat)
+#else
 INTERCEPTOR(int, __xstat, int magic, char *path, void *buf) {
   ENSURE_MSAN_INITED();
   int res = REAL(__xstat)(magic, path, buf);
@@ -733,9 +754,7 @@ INTERCEPTOR(int, __xstat, int magic, char *path, void *buf) {
     __msan_unpoison(buf, __sanitizer::struct_stat_sz);
   return res;
 }
-#define MSAN_MAYBE_INTERCEPT___XSTAT INTERCEPT_FUNCTION(__xstat)
-#else
-#define MSAN_MAYBE_INTERCEPT___XSTAT
+# define MSAN_INTERCEPT_STAT INTERCEPT_FUNCTION(__xstat)
 #endif
 
 #if !SANITIZER_FREEBSD
@@ -849,14 +868,29 @@ INTERCEPTOR(int, getrlimit64, int resource, void *rlim) {
 #define MSAN_MAYBE_INTERCEPT_GETRLIMIT64
 #endif
 
-INTERCEPTOR(int, uname, void *utsname) {
+#if SANITIZER_FREEBSD
+// FreeBSD's <sys/utsname.h> define uname() as
+// static __inline int uname(struct utsname *name) {
+//   return __xuname(SYS_NMLN, (void*)name);
+// }
+INTERCEPTOR(int, __xuname, int size, void *utsname) {
+  ENSURE_MSAN_INITED();
+  int res = REAL(__xuname)(size, utsname);
+  if (!res)
+    __msan_unpoison(utsname, __sanitizer::struct_utsname_sz);
+  return res;
+}
+#define MSAN_INTERCEPT_UNAME INTERCEPT_FUNCTION(__xuname)
+#else
+INTERCEPTOR(int, uname, struct utsname *utsname) {
   ENSURE_MSAN_INITED();
   int res = REAL(uname)(utsname);
-  if (!res) {
+  if (!res)
     __msan_unpoison(utsname, __sanitizer::struct_utsname_sz);
-  }
   return res;
 }
+#define MSAN_INTERCEPT_UNAME INTERCEPT_FUNCTION(uname)
+#endif
 
 INTERCEPTOR(int, gethostname, char *name, SIZE_T len) {
   ENSURE_MSAN_INITED();
@@ -918,17 +952,15 @@ INTERCEPTOR(SSIZE_T, recvfrom, int fd, void *buf, SIZE_T len, int flags,
     __msan_unpoison(buf, res);
     if (srcaddr) {
       SIZE_T sz = *addrlen;
-      __msan_unpoison(srcaddr, (sz < srcaddr_sz) ? sz : srcaddr_sz);
+      __msan_unpoison(srcaddr, Min(sz, srcaddr_sz));
     }
   }
   return res;
 }
 
 INTERCEPTOR(void *, calloc, SIZE_T nmemb, SIZE_T size) {
-  if (CallocShouldReturnNullDueToOverflow(size, nmemb))
-    return AllocatorReturnNull();
   GET_MALLOC_STACK_TRACE;
-  if (!msan_inited) {
+  if (UNLIKELY(!msan_inited)) {
     // Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
     const SIZE_T kCallocPoolSize = 1024;
     static uptr calloc_memory_for_dlsym[kCallocPoolSize];
@@ -939,7 +971,7 @@ INTERCEPTOR(void *, calloc, SIZE_T nmemb, SIZE_T size) {
     CHECK(allocated < kCallocPoolSize);
     return mem;
   }
-  return MsanReallocate(&stack, 0, nmemb * size, sizeof(u64), true);
+  return MsanCalloc(&stack, nmemb, size);
 }
 
 INTERCEPTOR(void *, realloc, void *ptr, SIZE_T size) {
@@ -952,13 +984,11 @@ INTERCEPTOR(void *, malloc, SIZE_T size) {
   return MsanReallocate(&stack, 0, size, sizeof(u64), false);
 }
 
-void __msan_allocated_memory(const void* data, uptr size) {
+void __msan_allocated_memory(const void *data, uptr size) {
   GET_MALLOC_STACK_TRACE;
-  if (flags()->poison_in_malloc)
-    __msan_poison(data, size);
-  if (__msan_get_track_origins()) {
-    Origin o = Origin::CreateHeapOrigin(&stack);
-    __msan_set_origin(data, size, o.raw_id());
+  if (flags()->poison_in_malloc) {
+    stack.tag = STACK_TRACE_TAG_POISON;
+    PoisonMemory(data, size, &stack);
   }
 }
 
@@ -1328,6 +1358,9 @@ int OnExit() {
   InterceptorScope interceptor_scope;                             \
   __msan_unpoison(__errno_location(), sizeof(int)); /* NOLINT */  \
   ENSURE_MSAN_INITED();
+#define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
+  do {                                            \
+  } while (false)
 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
   do {                                         \
   } while (false)
@@ -1345,8 +1378,11 @@ int OnExit() {
   } while (false)  // FIXME
 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name)
 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) OnExit()
-#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, map) \
-  if (map) ForEachMappedRegion((link_map *)map, __msan_unpoison);
+#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle)  \
+  do {                                                       \
+    link_map *map = GET_LINK_MAP_BY_DLOPEN_HANDLE((handle)); \
+    if (map) ForEachMappedRegion(map, __msan_unpoison);      \
+  } while (false)
 
 #include "sanitizer_common/sanitizer_common_interceptors.inc"
 
@@ -1360,53 +1396,26 @@ int OnExit() {
 #define COMMON_SYSCALL_POST_WRITE_RANGE(p, s) __msan_unpoison(p, s)
 #include "sanitizer_common/sanitizer_common_syscalls.inc"
 
-static void PoisonShadow(uptr ptr, uptr size, u8 value) {
-  uptr PageSize = GetPageSizeCached();
-  uptr shadow_beg = MEM_TO_SHADOW(ptr);
-  uptr shadow_end = MEM_TO_SHADOW(ptr + size);
-  if (value ||
-      shadow_end - shadow_beg < common_flags()->clear_shadow_mmap_threshold) {
-    REAL(memset)((void*)shadow_beg, value, shadow_end - shadow_beg);
-  } else {
-    uptr page_beg = RoundUpTo(shadow_beg, PageSize);
-    uptr page_end = RoundDownTo(shadow_end, PageSize);
-
-    if (page_beg >= page_end) {
-      REAL(memset)((void *)shadow_beg, 0, shadow_end - shadow_beg);
-    } else {
-      if (page_beg != shadow_beg) {
-        REAL(memset)((void *)shadow_beg, 0, page_beg - shadow_beg);
-      }
-      if (page_end != shadow_end) {
-        REAL(memset)((void *)page_end, 0, shadow_end - page_end);
-      }
-      MmapFixedNoReserve(page_beg, page_end - page_beg);
-    }
-  }
-}
-
 // These interface functions reside here so that they can use
 // REAL(memset), etc.
 void __msan_unpoison(const void *a, uptr size) {
   if (!MEM_IS_APP(a)) return;
-  PoisonShadow((uptr)a, size, 0);
+  SetShadow(a, size, 0);
 }
 
 void __msan_poison(const void *a, uptr size) {
   if (!MEM_IS_APP(a)) return;
-  PoisonShadow((uptr)a, size,
-               __msan::flags()->poison_heap_with_zeroes ? 0 : -1);
+  SetShadow(a, size, __msan::flags()->poison_heap_with_zeroes ? 0 : -1);
 }
 
 void __msan_poison_stack(void *a, uptr size) {
   if (!MEM_IS_APP(a)) return;
-  PoisonShadow((uptr)a, size,
-               __msan::flags()->poison_stack_with_zeroes ? 0 : -1);
+  SetShadow(a, size, __msan::flags()->poison_stack_with_zeroes ? 0 : -1);
 }
 
 void __msan_clear_and_unpoison(void *a, uptr size) {
   REAL(memset)(a, 0, size);
-  PoisonShadow((uptr)a, size, 0);
+  SetShadow(a, size, 0);
 }
 
 void *__msan_memcpy(void *dest, const void *src, SIZE_T n) {
@@ -1415,7 +1424,7 @@ void *__msan_memcpy(void *dest, const void *src, SIZE_T n) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
   void *res = REAL(memcpy)(dest, src, n);
-  CopyPoison(dest, src, n, &stack);
+  CopyShadowAndOrigin(dest, src, n, &stack);
   return res;
 }
 
@@ -1434,7 +1443,7 @@ void *__msan_memmove(void *dest, const void *src, SIZE_T n) {
   ENSURE_MSAN_INITED();
   GET_STORE_STACK_TRACE;
   void *res = REAL(memmove)(dest, src, n);
-  MovePoison(dest, src, n, &stack);
+  MoveShadowAndOrigin(dest, src, n, &stack);
   return res;
 }
 
@@ -1445,96 +1454,6 @@ void __msan_unpoison_string(const char* s) {
 
 namespace __msan {
 
-u32 GetOriginIfPoisoned(uptr addr, uptr size) {
-  unsigned char *s = (unsigned char *)MEM_TO_SHADOW(addr);
-  for (uptr i = 0; i < size; ++i)
-    if (s[i])
-      return *(u32 *)SHADOW_TO_ORIGIN(((uptr)s + i) & ~3UL);
-  return 0;
-}
-
-void SetOriginIfPoisoned(uptr addr, uptr src_shadow, uptr size,
-                         u32 src_origin) {
-  uptr dst_s = MEM_TO_SHADOW(addr);
-  uptr src_s = src_shadow;
-  uptr src_s_end = src_s + size;
-
-  for (; src_s < src_s_end; ++dst_s, ++src_s)
-    if (*(u8 *)src_s) *(u32 *)SHADOW_TO_ORIGIN(dst_s &~3UL) = src_origin;
-}
-
-void CopyOrigin(void *dst, const void *src, uptr size, StackTrace *stack) {
-  if (!__msan_get_track_origins()) return;
-  if (!MEM_IS_APP(dst) || !MEM_IS_APP(src)) return;
-
-  uptr d = (uptr)dst;
-  uptr beg = d & ~3UL;
-  // Copy left unaligned origin if that memory is poisoned.
-  if (beg < d) {
-    u32 o = GetOriginIfPoisoned((uptr)src, d - beg);
-    if (o) {
-      if (__msan_get_track_origins() > 1) o = ChainOrigin(o, stack);
-      *(u32 *)MEM_TO_ORIGIN(beg) = o;
-    }
-    beg += 4;
-  }
-
-  uptr end = (d + size) & ~3UL;
-  // If both ends fall into the same 4-byte slot, we are done.
-  if (end < beg) return;
-
-  // Copy right unaligned origin if that memory is poisoned.
-  if (end < d + size) {
-    u32 o = GetOriginIfPoisoned((uptr)src + (end - d), (d + size) - end);
-    if (o) {
-      if (__msan_get_track_origins() > 1) o = ChainOrigin(o, stack);
-      *(u32 *)MEM_TO_ORIGIN(end) = o;
-    }
-  }
-
-  if (beg < end) {
-    // Align src up.
-    uptr s = ((uptr)src + 3) & ~3UL;
-    // FIXME: factor out to msan_copy_origin_aligned
-    if (__msan_get_track_origins() > 1) {
-      u32 *src = (u32 *)MEM_TO_ORIGIN(s);
-      u32 *src_s = (u32 *)MEM_TO_SHADOW(s);
-      u32 *src_end = (u32 *)MEM_TO_ORIGIN(s + (end - beg));
-      u32 *dst = (u32 *)MEM_TO_ORIGIN(beg);
-      u32 src_o = 0;
-      u32 dst_o = 0;
-      for (; src < src_end; ++src, ++src_s, ++dst) {
-        if (!*src_s) continue;
-        if (*src != src_o) {
-          src_o = *src;
-          dst_o = ChainOrigin(src_o, stack);
-        }
-        *dst = dst_o;
-      }
-    } else {
-      REAL(memcpy)((void *)MEM_TO_ORIGIN(beg), (void *)MEM_TO_ORIGIN(s),
-                  end - beg);
-    }
-  }
-}
-
-void MovePoison(void *dst, const void *src, uptr size, StackTrace *stack) {
-  if (!MEM_IS_APP(dst)) return;
-  if (!MEM_IS_APP(src)) return;
-  if (src == dst) return;
-  REAL(memmove)((void *)MEM_TO_SHADOW((uptr)dst),
-                (void *)MEM_TO_SHADOW((uptr)src), size);
-  CopyOrigin(dst, src, size, stack);
-}
-
-void CopyPoison(void *dst, const void *src, uptr size, StackTrace *stack) {
-  if (!MEM_IS_APP(dst)) return;
-  if (!MEM_IS_APP(src)) return;
-  REAL(memcpy)((void *)MEM_TO_SHADOW((uptr)dst),
-              (void *)MEM_TO_SHADOW((uptr)src), size);
-  CopyOrigin(dst, src, size, stack);
-}
-
 void InitializeInterceptors() {
   static int inited = 0;
   CHECK_EQ(inited, 0);
@@ -1617,8 +1536,8 @@ void InitializeInterceptors() {
   INTERCEPT_FUNCTION(gettimeofday);
   INTERCEPT_FUNCTION(fcvt);
   MSAN_MAYBE_INTERCEPT___FXSTAT;
-  MSAN_MAYBE_INTERCEPT___FXSTATAT;
-  MSAN_MAYBE_INTERCEPT___XSTAT;
+  MSAN_INTERCEPT_FSTATAT;
+  MSAN_INTERCEPT_STAT;
   MSAN_MAYBE_INTERCEPT___LXSTAT;
   MSAN_MAYBE_INTERCEPT___FXSTAT64;
   MSAN_MAYBE_INTERCEPT___FXSTATAT64;
@@ -1631,7 +1550,7 @@ void InitializeInterceptors() {
   MSAN_MAYBE_INTERCEPT_FGETS_UNLOCKED;
   INTERCEPT_FUNCTION(getrlimit);
   MSAN_MAYBE_INTERCEPT_GETRLIMIT64;
-  INTERCEPT_FUNCTION(uname);
+  MSAN_INTERCEPT_UNAME;
   INTERCEPT_FUNCTION(gethostname);
   MSAN_MAYBE_INTERCEPT_EPOLL_WAIT;
   MSAN_MAYBE_INTERCEPT_EPOLL_PWAIT;
diff --git a/contrib/compiler-rt/lib/msan/msan_linux.cc b/contrib/compiler-rt/lib/msan/msan_linux.cc
index 0b67b531d51c..6c185165fc50 100644
--- a/contrib/compiler-rt/lib/msan/msan_linux.cc
+++ b/contrib/compiler-rt/lib/msan/msan_linux.cc
@@ -64,41 +64,45 @@ static bool ProtectMemoryRange(uptr beg, uptr size) {
   return true;
 }
 
+static void CheckMemoryLayoutSanity() {
+  uptr prev_end = 0;
+  for (unsigned i = 0; i < kMemoryLayoutSize; ++i) {
+    uptr start = kMemoryLayout[i].start;
+    uptr end = kMemoryLayout[i].end;
+    MappingDesc::Type type = kMemoryLayout[i].type;
+    CHECK_LT(start, end);
+    CHECK_EQ(prev_end, start);
+    CHECK(addr_is_type(start, type));
+    CHECK(addr_is_type((start + end) / 2, type));
+    CHECK(addr_is_type(end - 1, type));
+    if (type == MappingDesc::APP) {
+      uptr addr = start;
+      CHECK(MEM_IS_SHADOW(MEM_TO_SHADOW(addr)));
+      CHECK(MEM_IS_ORIGIN(MEM_TO_ORIGIN(addr)));
+      CHECK_EQ(MEM_TO_ORIGIN(addr), SHADOW_TO_ORIGIN(MEM_TO_SHADOW(addr)));
+
+      addr = (start + end) / 2;
+      CHECK(MEM_IS_SHADOW(MEM_TO_SHADOW(addr)));
+      CHECK(MEM_IS_ORIGIN(MEM_TO_ORIGIN(addr)));
+      CHECK_EQ(MEM_TO_ORIGIN(addr), SHADOW_TO_ORIGIN(MEM_TO_SHADOW(addr)));
+
+      addr = end - 1;
+      CHECK(MEM_IS_SHADOW(MEM_TO_SHADOW(addr)));
+      CHECK(MEM_IS_ORIGIN(MEM_TO_ORIGIN(addr)));
+      CHECK_EQ(MEM_TO_ORIGIN(addr), SHADOW_TO_ORIGIN(MEM_TO_SHADOW(addr)));
+    }
+    prev_end = end;
+  }
+}
+
 bool InitShadow(bool map_shadow, bool init_origins) {
   // Let user know mapping parameters first.
   VPrintf(1, "__msan_init %p\n", &__msan_init);
-  ReportMapRange("Low Memory ", kLowMemBeg, kLowMemSize);
-  ReportMapRange("Bad1       ", kBad1Beg, kBad1Size);
-  ReportMapRange("Shadow     ", kShadowBeg, kShadowSize);
-  ReportMapRange("Bad2       ", kBad2Beg, kBad2Size);
-  ReportMapRange("Origins    ", kOriginsBeg, kOriginsSize);
-  ReportMapRange("Bad3       ", kBad3Beg, kBad3Size);
-  ReportMapRange("High Memory", kHighMemBeg, kHighMemSize);
-
-  // Check mapping sanity (the invariant).
-  CHECK_EQ(kLowMemBeg, 0);
-  CHECK_EQ(kBad1Beg, kLowMemBeg + kLowMemSize);
-  CHECK_EQ(kShadowBeg, kBad1Beg + kBad1Size);
-  CHECK_GT(kShadowSize, 0);
-  CHECK_GE(kShadowSize, kLowMemSize + kHighMemSize);
-  CHECK_EQ(kBad2Beg, kShadowBeg + kShadowSize);
-  CHECK_EQ(kOriginsBeg, kBad2Beg + kBad2Size);
-  CHECK_EQ(kOriginsSize, kShadowSize);
-  CHECK_EQ(kBad3Beg, kOriginsBeg + kOriginsSize);
-  CHECK_EQ(kHighMemBeg, kBad3Beg + kBad3Size);
-  CHECK_GT(kHighMemSize, 0);
-  CHECK_GE(kHighMemBeg + kHighMemSize, kHighMemBeg);  // Tests for no overflow.
-
-  if (kLowMemSize > 0) {
-    CHECK(MEM_IS_SHADOW(MEM_TO_SHADOW(kLowMemBeg)));
-    CHECK(MEM_IS_SHADOW(MEM_TO_SHADOW(kLowMemBeg + kLowMemSize - 1)));
-    CHECK(MEM_IS_ORIGIN(MEM_TO_ORIGIN(kLowMemBeg)));
-    CHECK(MEM_IS_ORIGIN(MEM_TO_ORIGIN(kLowMemBeg + kLowMemSize - 1)));
-  }
-  CHECK(MEM_IS_SHADOW(MEM_TO_SHADOW(kHighMemBeg)));
-  CHECK(MEM_IS_SHADOW(MEM_TO_SHADOW(kHighMemBeg + kHighMemSize - 1)));
-  CHECK(MEM_IS_ORIGIN(MEM_TO_ORIGIN(kHighMemBeg)));
-  CHECK(MEM_IS_ORIGIN(MEM_TO_ORIGIN(kHighMemBeg + kHighMemSize - 1)));
+  for (unsigned i = 0; i < kMemoryLayoutSize; ++i)
+    VPrintf(1, "%s: %zx - %zx\n", kMemoryLayout[i].name, kMemoryLayout[i].start,
+            kMemoryLayout[i].end - 1);
+
+  CheckMemoryLayoutSanity();
 
   if (!MEM_IS_APP(&__msan_init)) {
     Printf("FATAL: Code %p is out of application range. Non-PIE build?\n",
@@ -106,29 +110,23 @@ bool InitShadow(bool map_shadow, bool init_origins) {
     return false;
   }
 
-  if (!CheckMemoryRangeAvailability(kShadowBeg, kShadowSize) ||
-      (init_origins &&
-        !CheckMemoryRangeAvailability(kOriginsBeg, kOriginsSize)) ||
-      !CheckMemoryRangeAvailability(kBad1Beg, kBad1Size) ||
-      !CheckMemoryRangeAvailability(kBad2Beg, kBad2Size) ||
-      !CheckMemoryRangeAvailability(kBad3Beg, kBad3Size)) {
-    return false;
-  }
-
-  if (!ProtectMemoryRange(kBad1Beg, kBad1Size) ||
-      !ProtectMemoryRange(kBad2Beg, kBad2Size) ||
-      !ProtectMemoryRange(kBad3Beg, kBad3Size)) {
-    return false;
+  for (unsigned i = 0; i < kMemoryLayoutSize; ++i) {
+    uptr start = kMemoryLayout[i].start;
+    uptr end = kMemoryLayout[i].end;
+    uptr size= end - start;
+    MappingDesc::Type type = kMemoryLayout[i].type;
+    if ((map_shadow && type == MappingDesc::SHADOW) ||
+        (init_origins && type == MappingDesc::ORIGIN)) {
+      if (!CheckMemoryRangeAvailability(start, size)) return false;
+      if ((uptr)MmapFixedNoReserve(start, size) != start) return false;
+      if (common_flags()->use_madv_dontdump)
+        DontDumpShadowMemory(start, size);
+    } else if (type == MappingDesc::INVALID) {
+      if (!CheckMemoryRangeAvailability(start, size)) return false;
+      if (!ProtectMemoryRange(start, size)) return false;
+    }
   }
 
-  if (map_shadow) {
-    void *shadow = MmapFixedNoReserve(kShadowBeg, kShadowSize);
-    if (shadow != (void*)kShadowBeg) return false;
-  }
-  if (init_origins) {
-    void *origins = MmapFixedNoReserve(kOriginsBeg, kOriginsSize);
-    if (origins != (void*)kOriginsBeg) return false;
-  }
   return true;
 }
 
@@ -137,7 +135,7 @@ void MsanDie() {
     __sanitizer_cov_dump();
   if (death_callback)
     death_callback();
-  _exit(flags()->exit_code);
+  internal__exit(flags()->exit_code);
 }
 
 static void MsanAtExit(void) {
@@ -157,20 +155,26 @@ void InstallAtExitHandler() {
 
 static pthread_key_t tsd_key;
 static bool tsd_key_inited = false;
+
 void MsanTSDInit(void (*destructor)(void *tsd)) {
   CHECK(!tsd_key_inited);
   tsd_key_inited = true;
   CHECK_EQ(0, pthread_key_create(&tsd_key, destructor));
 }
 
-void *MsanTSDGet() {
-  CHECK(tsd_key_inited);
-  return pthread_getspecific(tsd_key);
+static THREADLOCAL MsanThread* msan_current_thread;
+
+MsanThread *GetCurrentThread() {
+  return msan_current_thread;
 }
 
-void MsanTSDSet(void *tsd) {
+void SetCurrentThread(MsanThread *t) {
+  // Make sure we do not reset the current MsanThread.
+  CHECK_EQ(0, msan_current_thread);
+  msan_current_thread = t;
+  // Make sure that MsanTSDDtor gets called at the end.
   CHECK(tsd_key_inited);
-  pthread_setspecific(tsd_key, tsd);
+  pthread_setspecific(tsd_key, (void *)t);
 }
 
 void MsanTSDDtor(void *tsd) {
@@ -180,6 +184,9 @@ void MsanTSDDtor(void *tsd) {
     CHECK_EQ(0, pthread_setspecific(tsd_key, tsd));
     return;
   }
+  msan_current_thread = nullptr;
+  // Make sure that signal handler can not see a stale current thread pointer.
+  atomic_signal_fence(memory_order_seq_cst);
   MsanThread::TSDDtor(tsd);
 }
 
diff --git a/contrib/compiler-rt/lib/msan/msan_poisoning.cc b/contrib/compiler-rt/lib/msan/msan_poisoning.cc
new file mode 100644
index 000000000000..96411fdbc31b
--- /dev/null
+++ b/contrib/compiler-rt/lib/msan/msan_poisoning.cc
@@ -0,0 +1,174 @@
+//===-- msan_poisoning.cc ---------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of MemorySanitizer.
+//
+//===----------------------------------------------------------------------===//
+
+#include "msan_poisoning.h"
+
+#include "interception/interception.h"
+#include "msan_origin.h"
+#include "sanitizer_common/sanitizer_common.h"
+
+DECLARE_REAL(void *, memset, void *dest, int c, uptr n)
+DECLARE_REAL(void *, memcpy, void *dest, const void *src, uptr n)
+DECLARE_REAL(void *, memmove, void *dest, const void *src, uptr n)
+
+namespace __msan {
+
+u32 GetOriginIfPoisoned(uptr addr, uptr size) {
+  unsigned char *s = (unsigned char *)MEM_TO_SHADOW(addr);
+  for (uptr i = 0; i < size; ++i)
+    if (s[i]) return *(u32 *)SHADOW_TO_ORIGIN(((uptr)s + i) & ~3UL);
+  return 0;
+}
+
+void SetOriginIfPoisoned(uptr addr, uptr src_shadow, uptr size,
+                         u32 src_origin) {
+  uptr dst_s = MEM_TO_SHADOW(addr);
+  uptr src_s = src_shadow;
+  uptr src_s_end = src_s + size;
+
+  for (; src_s < src_s_end; ++dst_s, ++src_s)
+    if (*(u8 *)src_s) *(u32 *)SHADOW_TO_ORIGIN(dst_s & ~3UL) = src_origin;
+}
+
+void CopyOrigin(const void *dst, const void *src, uptr size,
+                StackTrace *stack) {
+  if (!MEM_IS_APP(dst) || !MEM_IS_APP(src)) return;
+
+  uptr d = (uptr)dst;
+  uptr beg = d & ~3UL;
+  // Copy left unaligned origin if that memory is poisoned.
+  if (beg < d) {
+    u32 o = GetOriginIfPoisoned((uptr)src, d - beg);
+    if (o) {
+      if (__msan_get_track_origins() > 1) o = ChainOrigin(o, stack);
+      *(u32 *)MEM_TO_ORIGIN(beg) = o;
+    }
+    beg += 4;
+  }
+
+  uptr end = (d + size) & ~3UL;
+  // If both ends fall into the same 4-byte slot, we are done.
+  if (end < beg) return;
+
+  // Copy right unaligned origin if that memory is poisoned.
+  if (end < d + size) {
+    u32 o = GetOriginIfPoisoned((uptr)src + (end - d), (d + size) - end);
+    if (o) {
+      if (__msan_get_track_origins() > 1) o = ChainOrigin(o, stack);
+      *(u32 *)MEM_TO_ORIGIN(end) = o;
+    }
+  }
+
+  if (beg < end) {
+    // Align src up.
+    uptr s = ((uptr)src + 3) & ~3UL;
+    // FIXME: factor out to msan_copy_origin_aligned
+    if (__msan_get_track_origins() > 1) {
+      u32 *src = (u32 *)MEM_TO_ORIGIN(s);
+      u32 *src_s = (u32 *)MEM_TO_SHADOW(s);
+      u32 *src_end = (u32 *)MEM_TO_ORIGIN(s + (end - beg));
+      u32 *dst = (u32 *)MEM_TO_ORIGIN(beg);
+      u32 src_o = 0;
+      u32 dst_o = 0;
+      for (; src < src_end; ++src, ++src_s, ++dst) {
+        if (!*src_s) continue;
+        if (*src != src_o) {
+          src_o = *src;
+          dst_o = ChainOrigin(src_o, stack);
+        }
+        *dst = dst_o;
+      }
+    } else {
+      REAL(memcpy)((void *)MEM_TO_ORIGIN(beg), (void *)MEM_TO_ORIGIN(s),
+                   end - beg);
+    }
+  }
+}
+
+void MoveShadowAndOrigin(const void *dst, const void *src, uptr size,
+                         StackTrace *stack) {
+  if (!MEM_IS_APP(dst)) return;
+  if (!MEM_IS_APP(src)) return;
+  if (src == dst) return;
+  REAL(memmove)((void *)MEM_TO_SHADOW((uptr)dst),
+                (void *)MEM_TO_SHADOW((uptr)src), size);
+  if (__msan_get_track_origins()) CopyOrigin(dst, src, size, stack);
+}
+
+void CopyShadowAndOrigin(const void *dst, const void *src, uptr size,
+                         StackTrace *stack) {
+  if (!MEM_IS_APP(dst)) return;
+  if (!MEM_IS_APP(src)) return;
+  REAL(memcpy)((void *)MEM_TO_SHADOW((uptr)dst),
+               (void *)MEM_TO_SHADOW((uptr)src), size);
+  if (__msan_get_track_origins()) CopyOrigin(dst, src, size, stack);
+}
+
+void CopyMemory(void *dst, const void *src, uptr size, StackTrace *stack) {
+  REAL(memcpy)(dst, src, size);
+  CopyShadowAndOrigin(dst, src, size, stack);
+}
+
+void SetShadow(const void *ptr, uptr size, u8 value) {
+  uptr PageSize = GetPageSizeCached();
+  uptr shadow_beg = MEM_TO_SHADOW(ptr);
+  uptr shadow_end = MEM_TO_SHADOW((uptr)ptr + size);
+  if (value ||
+      shadow_end - shadow_beg < common_flags()->clear_shadow_mmap_threshold) {
+    REAL(memset)((void *)shadow_beg, value, shadow_end - shadow_beg);
+  } else {
+    uptr page_beg = RoundUpTo(shadow_beg, PageSize);
+    uptr page_end = RoundDownTo(shadow_end, PageSize);
+
+    if (page_beg >= page_end) {
+      REAL(memset)((void *)shadow_beg, 0, shadow_end - shadow_beg);
+    } else {
+      if (page_beg != shadow_beg) {
+        REAL(memset)((void *)shadow_beg, 0, page_beg - shadow_beg);
+      }
+      if (page_end != shadow_end) {
+        REAL(memset)((void *)page_end, 0, shadow_end - page_end);
+      }
+      MmapFixedNoReserve(page_beg, page_end - page_beg);
+    }
+  }
+}
+
+void SetOrigin(const void *dst, uptr size, u32 origin) {
+  // Origin mapping is 4 bytes per 4 bytes of application memory.
+  // Here we extend the range such that its left and right bounds are both
+  // 4 byte aligned.
+  uptr x = MEM_TO_ORIGIN((uptr)dst);
+  uptr beg = x & ~3UL;               // align down.
+  uptr end = (x + size + 3) & ~3UL;  // align up.
+  u64 origin64 = ((u64)origin << 32) | origin;
+  // This is like memset, but the value is 32-bit. We unroll by 2 to write
+  // 64 bits at once. May want to unroll further to get 128-bit stores.
+  if (beg & 7ULL) {
+    *(u32 *)beg = origin;
+    beg += 4;
+  }
+  for (uptr addr = beg; addr < (end & ~7UL); addr += 8) *(u64 *)addr = origin64;
+  if (end & 7ULL) *(u32 *)(end - 4) = origin;
+}
+
+void PoisonMemory(const void *dst, uptr size, StackTrace *stack) {
+  SetShadow(dst, size, (u8)-1);
+
+  if (__msan_get_track_origins()) {
+    Origin o = Origin::CreateHeapOrigin(stack);
+    SetOrigin(dst, size, o.raw_id());
+  }
+}
+
+}  // namespace __msan
diff --git a/contrib/compiler-rt/lib/msan/msan_poisoning.h b/contrib/compiler-rt/lib/msan/msan_poisoning.h
new file mode 100644
index 000000000000..edacbeeab0a6
--- /dev/null
+++ b/contrib/compiler-rt/lib/msan/msan_poisoning.h
@@ -0,0 +1,59 @@
+//===-- msan_poisoning.h ----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of MemorySanitizer.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MSAN_POISONING_H
+#define MSAN_POISONING_H
+
+#include "msan.h"
+
+namespace __msan {
+
+// Return origin for the first poisoned byte in the memory range, or 0.
+u32 GetOriginIfPoisoned(uptr addr, uptr size);
+
+// Walk [addr, addr+size) app memory region, copying origin tags from the
+// corresponding positions in [src_origin, src_origin+size) where the
+// corresponding shadow in [src_shadow, src_shadow+size) is non-zero.
+void SetOriginIfPoisoned(uptr addr, uptr src_shadow, uptr size, u32 src_origin);
+
+// Copy origin from src (app address) to dst (app address), creating chained
+// origin ids as necessary, without overriding origin for fully initialized
+// quads.
+void CopyOrigin(const void *dst, const void *src, uptr size, StackTrace *stack);
+
+// memmove() shadow and origin. Dst and src are application addresses.
+// See CopyOrigin() for the origin copying logic.
+void MoveShadowAndOrigin(const void *dst, const void *src, uptr size,
+                         StackTrace *stack);
+
+// memcpy() shadow and origin. Dst and src are application addresses.
+// See CopyOrigin() for the origin copying logic.
+void CopyShadowAndOrigin(const void *dst, const void *src, uptr size,
+                         StackTrace *stack);
+
+// memcpy() app memory, and do "the right thing" to the corresponding shadow and
+// origin regions.
+void CopyMemory(void *dst, const void *src, uptr size, StackTrace *stack);
+
+// Fill shadow will value. Ptr is an application address.
+void SetShadow(const void *ptr, uptr size, u8 value);
+
+// Set origin for the memory region.
+void SetOrigin(const void *dst, uptr size, u32 origin);
+
+// Mark memory region uninitialized, with origins.
+void PoisonMemory(const void *dst, uptr size, StackTrace *stack);
+
+}  // namespace __msan
+
+#endif  // MSAN_POISONING_H
diff --git a/contrib/compiler-rt/lib/msan/msan_report.cc b/contrib/compiler-rt/lib/msan/msan_report.cc
index 717c4a958c8f..33c28b2fba0e 100644
--- a/contrib/compiler-rt/lib/msan/msan_report.cc
+++ b/contrib/compiler-rt/lib/msan/msan_report.cc
@@ -75,8 +75,23 @@ static void DescribeOrigin(u32 id) {
     DescribeStackOrigin(so, pc);
   } else {
     StackTrace stack = o.getStackTraceForHeapOrigin();
-    Printf("  %sUninitialized value was created by a heap allocation%s\n",
-           d.Origin(), d.End());
+    switch (stack.tag) {
+      case StackTrace::TAG_ALLOC:
+        Printf("  %sUninitialized value was created by a heap allocation%s\n",
+               d.Origin(), d.End());
+        break;
+      case StackTrace::TAG_DEALLOC:
+        Printf("  %sUninitialized value was created by a heap deallocation%s\n",
+               d.Origin(), d.End());
+        break;
+      case STACK_TRACE_TAG_POISON:
+        Printf("  %sMemory was marked as uninitialized%s\n", d.Origin(),
+               d.End());
+        break;
+      default:
+        Printf("  %sUninitialized value was created%s\n", d.Origin(), d.End());
+        break;
+    }
     stack.Print();
   }
 }
@@ -255,7 +270,7 @@ void ReportUMRInsideAddressRange(const char *what, const void *start, uptr size,
   Printf("%sUninitialized bytes in %s%s%s at offset %zu inside [%p, %zu)%s\n",
          d.Warning(), d.Name(), what, d.Warning(), offset, start, size,
          d.End());
-  if (__sanitizer::common_flags()->verbosity > 0)
+  if (__sanitizer::Verbosity())
     DescribeMemoryRange(start, size);
 }
 
diff --git a/contrib/compiler-rt/lib/msan/msan_thread.cc b/contrib/compiler-rt/lib/msan/msan_thread.cc
index f29a4b053a36..e15a247c6bb8 100644
--- a/contrib/compiler-rt/lib/msan/msan_thread.cc
+++ b/contrib/compiler-rt/lib/msan/msan_thread.cc
@@ -79,15 +79,4 @@ thread_return_t MsanThread::ThreadStart() {
   return res;
 }
 
-MsanThread *GetCurrentThread() {
-  return reinterpret_cast<MsanThread *>(MsanTSDGet());
-}
-
-void SetCurrentThread(MsanThread *t) {
-  // Make sure we do not reset the current MsanThread.
-  CHECK_EQ(0, MsanTSDGet());
-  MsanTSDSet(t);
-  CHECK_EQ(t, MsanTSDGet());
-}
-
 } // namespace __msan
diff --git a/contrib/compiler-rt/lib/msan/tests/msan_test.cc b/contrib/compiler-rt/lib/msan/tests/msan_test.cc
index 554265da6aa9..1c5fc5f7f1e3 100644
--- a/contrib/compiler-rt/lib/msan/tests/msan_test.cc
+++ b/contrib/compiler-rt/lib/msan/tests/msan_test.cc
@@ -21,13 +21,25 @@
 #include "sanitizer/allocator_interface.h"
 #include "sanitizer/msan_interface.h"
 
+#if defined(__FreeBSD__)
+# define _KERNEL  // To declare 'shminfo' structure.
+# include <sys/shm.h>
+# undef _KERNEL
+extern "C" {
+// <sys/shm.h> doesn't declare these functions in _KERNEL mode.
+void *shmat(int, const void *, int);
+int shmget(key_t, size_t, int);
+int shmctl(int, int, struct shmid_ds *);
+int shmdt(const void *);
+}
+#endif
+
 #include <inttypes.h>
 #include <stdlib.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <wchar.h>
 #include <math.h>
-#include <malloc.h>
 
 #include <arpa/inet.h>
 #include <dlfcn.h>
@@ -43,20 +55,31 @@
 #include <sys/resource.h>
 #include <sys/ioctl.h>
 #include <sys/statvfs.h>
-#include <sys/sysinfo.h>
 #include <sys/utsname.h>
 #include <sys/mman.h>
-#include <sys/vfs.h>
 #include <dirent.h>
 #include <pwd.h>
 #include <sys/socket.h>
 #include <netdb.h>
 #include <wordexp.h>
-#include <mntent.h>
-#include <netinet/ether.h>
 #include <sys/ipc.h>
 #include <sys/shm.h>
 
+#if !defined(__FreeBSD__)
+# include <malloc.h>
+# include <sys/sysinfo.h>
+# include <sys/vfs.h>
+# include <mntent.h>
+# include <netinet/ether.h>
+#else
+# include <netinet/in.h>
+# include <pthread_np.h>
+# include <sys/uio.h>
+# include <sys/mount.h>
+# define f_namelen f_namemax  // FreeBSD names this statfs field so.
+# define cpu_set_t cpuset_t
+#endif
+
 #if defined(__i386__) || defined(__x86_64__)
 # include <emmintrin.h>
 # define MSAN_HAS_M128 1
@@ -68,6 +91,19 @@
 # include <immintrin.h>
 #endif
 
+// On FreeBSD procfs is not enabled by default.
+#if defined(__FreeBSD__)
+# define FILE_TO_READ "/bin/cat"
+# define DIR_TO_READ "/bin"
+# define SUBFILE_TO_READ "cat"
+# define SYMLINK_TO_READ "/usr/bin/tar"
+#else
+# define FILE_TO_READ "/proc/self/stat"
+# define DIR_TO_READ "/proc/self"
+# define SUBFILE_TO_READ "stat"
+# define SYMLINK_TO_READ "/proc/self/exe"
+#endif
+
 static const size_t kPageSize = 4096;
 
 typedef unsigned char      U1;
@@ -493,10 +529,9 @@ static char *DynRetTestStr;
 
 TEST(MemorySanitizer, DynRet) {
   ReturnPoisoned<S8>();
-  EXPECT_NOT_POISONED(clearenv());
+  EXPECT_NOT_POISONED(atoi("0"));
 }
 
-
 TEST(MemorySanitizer, DynRet1) {
   ReturnPoisoned<S8>();
 }
@@ -551,7 +586,7 @@ TEST(MemorySanitizer, strerror) {
 TEST(MemorySanitizer, strerror_r) {
   errno = 0;
   char buf[1000];
-  char *res = strerror_r(EINVAL, buf, sizeof(buf));
+  char *res = (char*) (size_t) strerror_r(EINVAL, buf, sizeof(buf));
   ASSERT_EQ(0, errno);
   if (!res) res = buf; // POSIX version success.
   EXPECT_NOT_POISONED(strlen(res));
@@ -559,7 +594,7 @@ TEST(MemorySanitizer, strerror_r) {
 
 TEST(MemorySanitizer, fread) {
   char *x = new char[32];
-  FILE *f = fopen("/proc/self/stat", "r");
+  FILE *f = fopen(FILE_TO_READ, "r");
   ASSERT_TRUE(f != NULL);
   fread(x, 1, 32, f);
   EXPECT_NOT_POISONED(x[0]);
@@ -571,7 +606,7 @@ TEST(MemorySanitizer, fread) {
 
 TEST(MemorySanitizer, read) {
   char *x = new char[32];
-  int fd = open("/proc/self/stat", O_RDONLY);
+  int fd = open(FILE_TO_READ, O_RDONLY);
   ASSERT_GT(fd, 0);
   int sz = read(fd, x, 32);
   ASSERT_EQ(sz, 32);
@@ -584,7 +619,7 @@ TEST(MemorySanitizer, read) {
 
 TEST(MemorySanitizer, pread) {
   char *x = new char[32];
-  int fd = open("/proc/self/stat", O_RDONLY);
+  int fd = open(FILE_TO_READ, O_RDONLY);
   ASSERT_GT(fd, 0);
   int sz = pread(fd, x, 32, 0);
   ASSERT_EQ(sz, 32);
@@ -602,11 +637,11 @@ TEST(MemorySanitizer, readv) {
   iov[0].iov_len = 5;
   iov[1].iov_base = buf + 10;
   iov[1].iov_len = 2000;
-  int fd = open("/proc/self/stat", O_RDONLY);
+  int fd = open(FILE_TO_READ, O_RDONLY);
   ASSERT_GT(fd, 0);
   int sz = readv(fd, iov, 2);
   ASSERT_GE(sz, 0);
-  ASSERT_LT(sz, 5 + 2000);
+  ASSERT_LE(sz, 5 + 2000);
   ASSERT_GT((size_t)sz, iov[0].iov_len);
   EXPECT_POISONED(buf[0]);
   EXPECT_NOT_POISONED(buf[1]);
@@ -626,11 +661,11 @@ TEST(MemorySanitizer, preadv) {
   iov[0].iov_len = 5;
   iov[1].iov_base = buf + 10;
   iov[1].iov_len = 2000;
-  int fd = open("/proc/self/stat", O_RDONLY);
+  int fd = open(FILE_TO_READ, O_RDONLY);
   ASSERT_GT(fd, 0);
   int sz = preadv(fd, iov, 2, 3);
   ASSERT_GE(sz, 0);
-  ASSERT_LT(sz, 5 + 2000);
+  ASSERT_LE(sz, 5 + 2000);
   ASSERT_GT((size_t)sz, iov[0].iov_len);
   EXPECT_POISONED(buf[0]);
   EXPECT_NOT_POISONED(buf[1]);
@@ -652,15 +687,14 @@ TEST(MemorySanitizer, DISABLED_ioctl) {
 
 TEST(MemorySanitizer, readlink) {
   char *x = new char[1000];
-  readlink("/proc/self/exe", x, 1000);
+  readlink(SYMLINK_TO_READ, x, 1000);
   EXPECT_NOT_POISONED(x[0]);
   delete [] x;
 }
 
-
 TEST(MemorySanitizer, stat) {
   struct stat* st = new struct stat;
-  int res = stat("/proc/self/stat", st);
+  int res = stat(FILE_TO_READ, st);
   ASSERT_EQ(0, res);
   EXPECT_NOT_POISONED(st->st_dev);
   EXPECT_NOT_POISONED(st->st_mode);
@@ -669,9 +703,9 @@ TEST(MemorySanitizer, stat) {
 
 TEST(MemorySanitizer, fstatat) {
   struct stat* st = new struct stat;
-  int dirfd = open("/proc/self", O_RDONLY);
+  int dirfd = open(DIR_TO_READ, O_RDONLY);
   ASSERT_GT(dirfd, 0);
-  int res = fstatat(dirfd, "stat", st, 0);
+  int res = fstatat(dirfd, SUBFILE_TO_READ, st, 0);
   ASSERT_EQ(0, res);
   EXPECT_NOT_POISONED(st->st_dev);
   EXPECT_NOT_POISONED(st->st_mode);
@@ -763,6 +797,8 @@ TEST(MemorySanitizer, poll) {
   close(pipefd[1]);
 }
 
+// There is no ppoll() on FreeBSD.
+#if !defined (__FreeBSD__)
 TEST(MemorySanitizer, ppoll) {
   int* pipefd = new int[2];
   int res = pipe(pipefd);
@@ -787,6 +823,7 @@ TEST(MemorySanitizer, ppoll) {
   close(pipefd[0]);
   close(pipefd[1]);
 }
+#endif
 
 TEST(MemorySanitizer, poll_positive) {
   int* pipefd = new int[2];
@@ -851,8 +888,11 @@ TEST(MemorySanitizer, accept) {
   res = fcntl(connect_socket, F_SETFL, O_NONBLOCK);
   ASSERT_EQ(0, res);
   res = connect(connect_socket, (struct sockaddr *)&sai, sizeof(sai));
-  ASSERT_EQ(-1, res);
-  ASSERT_EQ(EINPROGRESS, errno);
+  // On FreeBSD this connection completes immediately.
+  if (res != 0) {
+    ASSERT_EQ(-1, res);
+    ASSERT_EQ(EINPROGRESS, errno);
+  }
 
   __msan_poison(&sai, sizeof(sai));
   int new_sock = accept(listen_socket, (struct sockaddr *)&sai, &sz);
@@ -973,7 +1013,6 @@ TEST(MemorySanitizer, recvmsg) {
   ASSERT_EQ(0, res);
   ASSERT_EQ(sizeof(client_sai), sz);
 
-  
   const char *s = "message text";
   struct iovec iov;
   iov.iov_base = (void *)s;
@@ -1125,12 +1164,15 @@ TEST(MemorySanitizer, getcwd_gnu) {
   free(res);
 }
 
+// There's no get_current_dir_name() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, get_current_dir_name) {
   char* res = get_current_dir_name();
   ASSERT_TRUE(res != NULL);
   EXPECT_NOT_POISONED(res[0]);
   free(res);
 }
+#endif
 
 TEST(MemorySanitizer, shmctl) {
   int id = shmget(IPC_PRIVATE, 4096, 0644 | IPC_CREAT);
@@ -1141,6 +1183,8 @@ TEST(MemorySanitizer, shmctl) {
   ASSERT_GT(res, -1);
   EXPECT_NOT_POISONED(ds);
 
+  // FreeBSD does not support shmctl(IPC_INFO) and shmctl(SHM_INFO).
+#if !defined(__FreeBSD__)
   struct shminfo si;
   res = shmctl(id, IPC_INFO, (struct shmid_ds *)&si);
   ASSERT_GT(res, -1);
@@ -1150,6 +1194,7 @@ TEST(MemorySanitizer, shmctl) {
   res = shmctl(id, SHM_INFO, (struct shmid_ds *)&s_i);
   ASSERT_GT(res, -1);
   EXPECT_NOT_POISONED(s_i);
+#endif
 
   res = shmctl(id, IPC_RMID, 0);
   ASSERT_GT(res, -1);
@@ -1157,7 +1202,7 @@ TEST(MemorySanitizer, shmctl) {
 
 TEST(MemorySanitizer, shmat) {
   void *p = mmap(NULL, 4096, PROT_READ | PROT_WRITE,
-                 MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
   ASSERT_NE(MAP_FAILED, p);
 
   ((char *)p)[10] = *GetPoisoned<U1>();
@@ -1183,6 +1228,8 @@ TEST(MemorySanitizer, shmat) {
   ASSERT_GT(res, -1);
 }
 
+// There's no random_r() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, random_r) {
   int32_t x;
   char z[64];
@@ -1198,6 +1245,7 @@ TEST(MemorySanitizer, random_r) {
   ASSERT_EQ(0, res);
   EXPECT_NOT_POISONED(x);
 }
+#endif
 
 TEST(MemorySanitizer, confstr) {
   char buf[3];
@@ -1215,6 +1263,16 @@ TEST(MemorySanitizer, confstr) {
   ASSERT_EQ(res, strlen(buf2) + 1);
 }
 
+TEST(MemorySanitizer, opendir) {
+  DIR *dir = opendir(".");
+  closedir(dir);
+
+  char name[10] = ".";
+  __msan_poison(name, sizeof(name));
+  EXPECT_UMR(dir = opendir(name));
+  closedir(dir);
+}
+
 TEST(MemorySanitizer, readdir) {
   DIR *dir = opendir(".");
   struct dirent *d = readdir(dir);
@@ -1251,6 +1309,8 @@ TEST(MemorySanitizer, realpath_null) {
   free(res);
 }
 
+// There's no canonicalize_file_name() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, canonicalize_file_name) {
   const char* relpath = ".";
   char* res = canonicalize_file_name(relpath);
@@ -1258,6 +1318,7 @@ TEST(MemorySanitizer, canonicalize_file_name) {
   EXPECT_NOT_POISONED(res[0]);
   free(res);
 }
+#endif
 
 extern char **environ;
 
@@ -1655,26 +1716,35 @@ TEST(MemorySanitizer, modfl) {
   EXPECT_NOT_POISONED(y);
 }
 
+// There's no sincos() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, sincos) {
   double s, c;
   sincos(0.2, &s, &c);
   EXPECT_NOT_POISONED(s);
   EXPECT_NOT_POISONED(c);
 }
+#endif
 
+// There's no sincosf() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, sincosf) {
   float s, c;
   sincosf(0.2, &s, &c);
   EXPECT_NOT_POISONED(s);
   EXPECT_NOT_POISONED(c);
 }
+#endif
 
+// There's no sincosl() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, sincosl) {
   long double s, c;
   sincosl(0.2, &s, &c);
   EXPECT_NOT_POISONED(s);
   EXPECT_NOT_POISONED(c);
 }
+#endif
 
 TEST(MemorySanitizer, remquo) {
   int quo;
@@ -1729,13 +1799,18 @@ TEST(MemorySanitizer, lgammaf_r) {
   EXPECT_NOT_POISONED(sgn);
 }
 
+// There's no lgammal_r() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, lgammal_r) {
   int sgn;
   long double res = lgammal_r(1.1, &sgn);
   ASSERT_NE(0.0, res);
   EXPECT_NOT_POISONED(sgn);
 }
+#endif
 
+// There's no drand48_r() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, drand48_r) {
   struct drand48_data buf;
   srand48_r(0, &buf);
@@ -1743,7 +1818,10 @@ TEST(MemorySanitizer, drand48_r) {
   drand48_r(&buf, &d);
   EXPECT_NOT_POISONED(d);
 }
+#endif
 
+// There's no lrand48_r() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, lrand48_r) {
   struct drand48_data buf;
   srand48_r(0, &buf);
@@ -1751,6 +1829,7 @@ TEST(MemorySanitizer, lrand48_r) {
   lrand48_r(&buf, &d);
   EXPECT_NOT_POISONED(d);
 }
+#endif
 
 TEST(MemorySanitizer, sprintf) {  // NOLINT
   char buff[10];
@@ -2015,6 +2094,8 @@ TEST(MemorySanitizer, localtime_r) {
   EXPECT_NE(0U, strlen(time.tm_zone));
 }
 
+// There's no getmntent() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, getmntent) {
   FILE *fp = setmntent("/etc/fstab", "r");
   struct mntent *mnt = getmntent(fp);
@@ -2027,7 +2108,10 @@ TEST(MemorySanitizer, getmntent) {
   EXPECT_NOT_POISONED(mnt->mnt_passno);
   fclose(fp);
 }
+#endif
 
+// There's no getmntent_r() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, getmntent_r) {
   FILE *fp = setmntent("/etc/fstab", "r");
   struct mntent mntbuf;
@@ -2042,6 +2126,7 @@ TEST(MemorySanitizer, getmntent_r) {
   EXPECT_NOT_POISONED(mnt->mnt_passno);
   fclose(fp);
 }
+#endif
 
 TEST(MemorySanitizer, ether) {
   const char *asc = "11:22:33:44:55:66";
@@ -2813,12 +2898,15 @@ TEST(MemorySanitizer, dlopenFailed) {
 
 #endif // MSAN_TEST_DISABLE_DLOPEN
 
+// There's no sched_getaffinity() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, sched_getaffinity) {
   cpu_set_t mask;
   int res = sched_getaffinity(getpid(), sizeof(mask), &mask);
   ASSERT_EQ(0, res);
   EXPECT_NOT_POISONED(mask);
 }
+#endif
 
 TEST(MemorySanitizer, scanf) {
   const char *input = "42 hello";
@@ -3048,11 +3136,14 @@ TEST(MemorySanitizer, posix_memalign) {
   free(p);
 }
 
+// There's no memalign() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, memalign) {
   void *p = memalign(4096, 13);
   EXPECT_EQ(0U, (uintptr_t)p % kPageSize);
   free(p);
 }
+#endif
 
 TEST(MemorySanitizer, valloc) {
   void *a = valloc(100);
@@ -3060,6 +3151,8 @@ TEST(MemorySanitizer, valloc) {
   free(a);
 }
 
+// There's no pvalloc() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, pvalloc) {
   void *p = pvalloc(kPageSize + 100);
   EXPECT_EQ(0U, (uintptr_t)p % kPageSize);
@@ -3071,6 +3164,7 @@ TEST(MemorySanitizer, pvalloc) {
   EXPECT_EQ(kPageSize, __sanitizer_get_allocated_size(p));
   free(p);
 }
+#endif
 
 TEST(MemorySanitizer, inet_pton) {
   const char *s = "1:0:0:0:0:0:0:8";
@@ -3114,12 +3208,15 @@ TEST(MemorySanitizer, gethostname) {
   EXPECT_NOT_POISONED(strlen(buf));
 }
 
+// There's no sysinfo() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, sysinfo) {
   struct sysinfo info;
   int res = sysinfo(&info);
   ASSERT_EQ(0, res);
   EXPECT_NOT_POISONED(info);
 }
+#endif
 
 TEST(MemorySanitizer, getpwuid) {
   struct passwd *p = getpwuid(0); // root
@@ -3207,6 +3304,8 @@ TEST(MemorySanitizer, getpwent_r) {
   EXPECT_NOT_POISONED(pwdres);
 }
 
+// There's no fgetpwent() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, fgetpwent) {
   FILE *fp = fopen("/etc/passwd", "r");
   struct passwd *p = fgetpwent(fp);
@@ -3217,6 +3316,7 @@ TEST(MemorySanitizer, fgetpwent) {
   EXPECT_NOT_POISONED(p->pw_uid);
   fclose(fp);
 }
+#endif
 
 TEST(MemorySanitizer, getgrent) {
   setgrent();
@@ -3228,6 +3328,8 @@ TEST(MemorySanitizer, getgrent) {
   EXPECT_NOT_POISONED(p->gr_gid);
 }
 
+// There's no fgetgrent() on FreeBSD.
+#if !defined(__FreeBSD__)
 TEST(MemorySanitizer, fgetgrent) {
   FILE *fp = fopen("/etc/group", "r");
   struct group *grp = fgetgrent(fp);
@@ -3242,6 +3344,7 @@ TEST(MemorySanitizer, fgetgrent) {
   }
   fclose(fp);
 }
+#endif
 
 TEST(MemorySanitizer, getgrent_r) {
   struct group grp;
@@ -3597,7 +3700,7 @@ TEST(MemorySanitizer, UnalignedStore64_precise2) {
   EXPECT_POISONED_O(x[11], originx3);
 }
 
-#if defined(__clang__)
+#if (defined(__x86_64__) && defined(__clang__))
 namespace {
 typedef U1 V16x8 __attribute__((__vector_size__(16)));
 typedef U2 V8x16 __attribute__((__vector_size__(16)));
@@ -4116,7 +4219,8 @@ TEST(MemorySanitizer, LargeAllocatorUnpoisonsOnFree) {
 
   // Allocate the page that was released to the OS in free() with the real mmap,
   // bypassing the interceptor.
-  char *q = (char *)real_mmap(p, 4096, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
+  char *q = (char *)real_mmap(p, 4096, PROT_READ | PROT_WRITE,
+                              MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
   ASSERT_NE((char *)0, q);
 
   ASSERT_TRUE(q <= p);
diff --git a/contrib/compiler-rt/lib/profile/InstrProfilingFile.c b/contrib/compiler-rt/lib/profile/InstrProfilingFile.c
index 5aef3904b56d..346665fd5b3e 100644
--- a/contrib/compiler-rt/lib/profile/InstrProfilingFile.c
+++ b/contrib/compiler-rt/lib/profile/InstrProfilingFile.c
@@ -11,6 +11,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <sys/errno.h>
 
 #define UNCONST(ptr) ((void *)(uintptr_t)(ptr))
 
@@ -175,7 +176,11 @@ int __llvm_profile_write_file(void) {
     return -1;
 
   /* Write the file. */
-  return writeFileWithName(__llvm_profile_CurrentFilename);
+  int rc = writeFileWithName(__llvm_profile_CurrentFilename);
+  if (rc && getenv("LLVM_PROFILE_VERBOSE_ERRORS"))
+    fprintf(stderr, "LLVM Profile: Failed to write file \"%s\": %s\n",
+            __llvm_profile_CurrentFilename, strerror(errno));
+  return rc;
 }
 
 static void writeFileWithoutReturn(void) {
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_allocator.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_allocator.cc
index 47509f83665b..03b3e83153de 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_allocator.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_allocator.cc
@@ -14,7 +14,6 @@
 #include "sanitizer_allocator.h"
 #include "sanitizer_allocator_internal.h"
 #include "sanitizer_common.h"
-#include "sanitizer_flags.h"
 
 namespace __sanitizer {
 
@@ -61,7 +60,7 @@ InternalAllocator *internal_allocator() {
     SpinMutexLock l(&internal_alloc_init_mu);
     if (atomic_load(&internal_allocator_initialized, memory_order_relaxed) ==
         0) {
-      internal_allocator_instance->Init();
+      internal_allocator_instance->Init(/* may_return_null*/ false);
       atomic_store(&internal_allocator_initialized, 1, memory_order_release);
     }
   }
@@ -140,14 +139,12 @@ bool CallocShouldReturnNullDueToOverflow(uptr size, uptr n) {
   return (max / size) < n;
 }
 
-void *AllocatorReturnNull() {
-  if (common_flags()->allocator_may_return_null)
-    return 0;
+void NORETURN ReportAllocatorCannotReturnNull() {
   Report("%s's allocator is terminating the process instead of returning 0\n",
          SanitizerToolName);
   Report("If you don't like this behavior set allocator_may_return_null=1\n");
   CHECK(0);
-  return 0;
+  Die();
 }
 
 }  // namespace __sanitizer
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_allocator.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_allocator.h
index 23218016b791..b5105f8c2555 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_allocator.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_allocator.h
@@ -23,8 +23,8 @@
 
 namespace __sanitizer {
 
-// Depending on allocator_may_return_null either return 0 or crash.
-void *AllocatorReturnNull();
+// Prints error message and kills the program.
+void NORETURN ReportAllocatorCannotReturnNull();
 
 // SizeClassMap maps allocation sizes into size classes and back.
 // Class 0 corresponds to size 0.
@@ -211,6 +211,7 @@ class AllocatorStats {
   void Init() {
     internal_memset(this, 0, sizeof(*this));
   }
+  void InitLinkerInitialized() {}
 
   void Add(AllocatorStat i, uptr v) {
     v += atomic_load(&stats_[i], memory_order_relaxed);
@@ -240,11 +241,14 @@ class AllocatorStats {
 // Global stats, used for aggregation and querying.
 class AllocatorGlobalStats : public AllocatorStats {
  public:
-  void Init() {
-    internal_memset(this, 0, sizeof(*this));
+  void InitLinkerInitialized() {
     next_ = this;
     prev_ = this;
   }
+  void Init() {
+    internal_memset(this, 0, sizeof(*this));
+    InitLinkerInitialized();
+  }
 
   void Register(AllocatorStats *s) {
     SpinMutexLock l(&mu_);
@@ -1002,9 +1006,14 @@ struct SizeClassAllocatorLocalCache {
 template <class MapUnmapCallback = NoOpMapUnmapCallback>
 class LargeMmapAllocator {
  public:
-  void Init() {
-    internal_memset(this, 0, sizeof(*this));
+  void InitLinkerInitialized(bool may_return_null) {
     page_size_ = GetPageSizeCached();
+    atomic_store(&may_return_null_, may_return_null, memory_order_relaxed);
+  }
+
+  void Init(bool may_return_null) {
+    internal_memset(this, 0, sizeof(*this));
+    InitLinkerInitialized(may_return_null);
   }
 
   void *Allocate(AllocatorStats *stat, uptr size, uptr alignment) {
@@ -1012,7 +1021,9 @@ class LargeMmapAllocator {
     uptr map_size = RoundUpMapSize(size);
     if (alignment > page_size_)
       map_size += alignment;
-    if (map_size < size) return AllocatorReturnNull();  // Overflow.
+    // Overflow.
+    if (map_size < size)
+      return ReturnNullOrDie();
     uptr map_beg = reinterpret_cast<uptr>(
         MmapOrDie(map_size, "LargeMmapAllocator"));
     CHECK(IsAligned(map_beg, page_size_));
@@ -1048,6 +1059,16 @@ class LargeMmapAllocator {
     return reinterpret_cast<void*>(res);
   }
 
+  void *ReturnNullOrDie() {
+    if (atomic_load(&may_return_null_, memory_order_acquire))
+      return 0;
+    ReportAllocatorCannotReturnNull();
+  }
+
+  void SetMayReturnNull(bool may_return_null) {
+    atomic_store(&may_return_null_, may_return_null, memory_order_release);
+  }
+
   void Deallocate(AllocatorStats *stat, void *p) {
     Header *h = GetHeader(p);
     {
@@ -1226,6 +1247,7 @@ class LargeMmapAllocator {
   struct Stats {
     uptr n_allocs, n_frees, currently_allocated, max_allocated, by_size_log[64];
   } stats;
+  atomic_uint8_t may_return_null_;
   SpinMutex mutex_;
 };
 
@@ -1239,19 +1261,32 @@ template <class PrimaryAllocator, class AllocatorCache,
           class SecondaryAllocator>  // NOLINT
 class CombinedAllocator {
  public:
-  void Init() {
+  void InitCommon(bool may_return_null) {
     primary_.Init();
-    secondary_.Init();
+    atomic_store(&may_return_null_, may_return_null, memory_order_relaxed);
+  }
+
+  void InitLinkerInitialized(bool may_return_null) {
+    secondary_.InitLinkerInitialized(may_return_null);
+    stats_.InitLinkerInitialized();
+    InitCommon(may_return_null);
+  }
+
+  void Init(bool may_return_null) {
+    secondary_.Init(may_return_null);
     stats_.Init();
+    InitCommon(may_return_null);
   }
 
   void *Allocate(AllocatorCache *cache, uptr size, uptr alignment,
-                 bool cleared = false) {
+                 bool cleared = false, bool check_rss_limit = false) {
     // Returning 0 on malloc(0) may break a lot of code.
     if (size == 0)
       size = 1;
     if (size + alignment < size)
-      return AllocatorReturnNull();
+      return ReturnNullOrDie();
+    if (check_rss_limit && RssLimitIsExceeded())
+      return ReturnNullOrDie();
     if (alignment > 8)
       size = RoundUpTo(size, alignment);
     void *res;
@@ -1267,6 +1302,30 @@ class CombinedAllocator {
     return res;
   }
 
+  bool MayReturnNull() const {
+    return atomic_load(&may_return_null_, memory_order_acquire);
+  }
+
+  void *ReturnNullOrDie() {
+    if (MayReturnNull())
+      return 0;
+    ReportAllocatorCannotReturnNull();
+  }
+
+  void SetMayReturnNull(bool may_return_null) {
+    secondary_.SetMayReturnNull(may_return_null);
+    atomic_store(&may_return_null_, may_return_null, memory_order_release);
+  }
+
+  bool RssLimitIsExceeded() {
+    return atomic_load(&rss_limit_is_exceeded_, memory_order_acquire);
+  }
+
+  void SetRssLimitIsExceeded(bool rss_limit_is_exceeded) {
+    atomic_store(&rss_limit_is_exceeded_, rss_limit_is_exceeded,
+                 memory_order_release);
+  }
+
   void Deallocate(AllocatorCache *cache, void *p) {
     if (!p) return;
     if (primary_.PointerIsMine(p))
@@ -1379,6 +1438,8 @@ class CombinedAllocator {
   PrimaryAllocator primary_;
   SecondaryAllocator secondary_;
   AllocatorGlobalStats stats_;
+  atomic_uint8_t may_return_null_;
+  atomic_uint8_t rss_limit_is_exceeded_;
 };
 
 // Returns true if calloc(size, n) should return 0 due to overflow in size*n.
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_allocator_internal.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_allocator_internal.h
index 4409fd65bf31..9b9cfd0b5931 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_allocator_internal.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_allocator_internal.h
@@ -49,6 +49,15 @@ void *InternalAlloc(uptr size, InternalAllocatorCache *cache = 0);
 void InternalFree(void *p, InternalAllocatorCache *cache = 0);
 InternalAllocator *internal_allocator();
 
+enum InternalAllocEnum {
+  INTERNAL_ALLOC
+};
+
 }  // namespace __sanitizer
 
+inline void *operator new(__sanitizer::operator_new_size_type size,
+                          InternalAllocEnum) {
+  return InternalAlloc(size);
+}
+
 #endif  // SANITIZER_ALLOCATOR_INTERNAL_H
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common.cc
index c3740f24a366..489081e0760b 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common.cc
@@ -12,13 +12,17 @@
 //===----------------------------------------------------------------------===//
 
 #include "sanitizer_common.h"
+#include "sanitizer_allocator_internal.h"
 #include "sanitizer_flags.h"
 #include "sanitizer_libc.h"
+#include "sanitizer_placement_new.h"
 
 namespace __sanitizer {
 
 const char *SanitizerToolName = "SanitizerTool";
 
+atomic_uint32_t current_verbosity;
+
 uptr GetPageSizeCached() {
   static uptr PageSize;
   if (!PageSize)
@@ -94,19 +98,23 @@ uptr stoptheworld_tracer_pid = 0;
 // writing to the same log file.
 uptr stoptheworld_tracer_ppid = 0;
 
-static DieCallbackType DieCallback;
+static DieCallbackType InternalDieCallback, UserDieCallback;
 void SetDieCallback(DieCallbackType callback) {
-  DieCallback = callback;
+  InternalDieCallback = callback;
+}
+void SetUserDieCallback(DieCallbackType callback) {
+  UserDieCallback = callback;
 }
 
 DieCallbackType GetDieCallback() {
-  return DieCallback;
+  return InternalDieCallback;
 }
 
 void NORETURN Die() {
-  if (DieCallback) {
-    DieCallback();
-  }
+  if (UserDieCallback)
+    UserDieCallback();
+  if (InternalDieCallback)
+    InternalDieCallback();
   internal__exit(1);
 }
 
@@ -125,8 +133,8 @@ void NORETURN CheckFailed(const char *file, int line, const char *cond,
   Die();
 }
 
-uptr ReadFileToBuffer(const char *file_name, char **buff,
-                      uptr *buff_size, uptr max_len) {
+uptr ReadFileToBuffer(const char *file_name, char **buff, uptr *buff_size,
+                      uptr max_len, int *errno_p) {
   uptr PageSize = GetPageSizeCached();
   uptr kMinFileLen = PageSize;
   uptr read_len = 0;
@@ -135,7 +143,7 @@ uptr ReadFileToBuffer(const char *file_name, char **buff,
   // The files we usually open are not seekable, so try different buffer sizes.
   for (uptr size = kMinFileLen; size <= max_len; size *= 2) {
     uptr openrv = OpenFile(file_name, /*write*/ false);
-    if (internal_iserror(openrv)) return 0;
+    if (internal_iserror(openrv, errno_p)) return 0;
     fd_t fd = openrv;
     UnmapOrDie(*buff, *buff_size);
     *buff = (char*)MmapOrDie(size, __func__);
@@ -145,6 +153,10 @@ uptr ReadFileToBuffer(const char *file_name, char **buff,
     bool reached_eof = false;
     while (read_len + PageSize <= size) {
       uptr just_read = internal_read(fd, *buff + read_len, PageSize);
+      if (internal_iserror(just_read, errno_p)) {
+        UnmapOrDie(*buff, *buff_size);
+        return 0;
+      }
       if (just_read == 0) {
         reached_eof = true;
         break;
@@ -233,20 +245,28 @@ void ReportErrorSummary(const char *error_type, const char *file,
 LoadedModule::LoadedModule(const char *module_name, uptr base_address) {
   full_name_ = internal_strdup(module_name);
   base_address_ = base_address;
-  n_ranges_ = 0;
+  ranges_.clear();
+}
+
+void LoadedModule::clear() {
+  InternalFree(full_name_);
+  while (!ranges_.empty()) {
+    AddressRange *r = ranges_.front();
+    ranges_.pop_front();
+    InternalFree(r);
+  }
 }
 
 void LoadedModule::addAddressRange(uptr beg, uptr end, bool executable) {
-  CHECK_LT(n_ranges_, kMaxNumberOfAddressRanges);
-  ranges_[n_ranges_].beg = beg;
-  ranges_[n_ranges_].end = end;
-  exec_[n_ranges_] = executable;
-  n_ranges_++;
+  void *mem = InternalAlloc(sizeof(AddressRange));
+  AddressRange *r = new(mem) AddressRange(beg, end, executable);
+  ranges_.push_back(r);
 }
 
 bool LoadedModule::containsAddress(uptr address) const {
-  for (uptr i = 0; i < n_ranges_; i++) {
-    if (ranges_[i].beg <= address && address < ranges_[i].end)
+  for (Iterator iter = ranges(); iter.hasNext();) {
+    const AddressRange *r = iter.next();
+    if (r->beg <= address && address < r->end)
       return true;
   }
   return false;
@@ -280,4 +300,9 @@ void __sanitizer_set_report_path(const char *path) {
 void __sanitizer_report_error_summary(const char *error_summary) {
   Printf("%s\n", error_summary);
 }
+
+SANITIZER_INTERFACE_ATTRIBUTE
+void __sanitizer_set_death_callback(void (*callback)(void)) {
+  SetUserDieCallback(callback);
+}
 }  // extern "C"
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common.h
index c00dce66bb07..720cd73a43c5 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common.h
@@ -16,10 +16,11 @@
 #ifndef SANITIZER_COMMON_H
 #define SANITIZER_COMMON_H
 
+#include "sanitizer_flags.h"
 #include "sanitizer_internal_defs.h"
 #include "sanitizer_libc.h"
+#include "sanitizer_list.h"
 #include "sanitizer_mutex.h"
-#include "sanitizer_flags.h"
 
 namespace __sanitizer {
 struct StackTrace;
@@ -40,6 +41,14 @@ const uptr kMaxThreadStackSize = 1 << 30;  // 1Gb
 
 extern const char *SanitizerToolName;  // Can be changed by the tool.
 
+extern atomic_uint32_t current_verbosity;
+INLINE void SetVerbosity(int verbosity) {
+  atomic_store(&current_verbosity, verbosity, memory_order_relaxed);
+}
+INLINE int Verbosity() {
+  return atomic_load(&current_verbosity, memory_order_relaxed);
+}
+
 uptr GetPageSize();
 uptr GetPageSizeCached();
 uptr GetMmapGranularity();
@@ -67,6 +76,8 @@ void FlushUnneededShadowMemory(uptr addr, uptr size);
 void IncreaseTotalMmap(uptr size);
 void DecreaseTotalMmap(uptr size);
 uptr GetRSS();
+void NoHugePagesInRegion(uptr addr, uptr length);
+void DontDumpShadowMemory(uptr addr, uptr length);
 
 // InternalScopedBuffer can be used instead of large stack arrays to
 // keep frame size low.
@@ -135,11 +146,11 @@ void Report(const char *format, ...);
 void SetPrintfAndReportCallback(void (*callback)(const char *));
 #define VReport(level, ...)                                              \
   do {                                                                   \
-    if ((uptr)common_flags()->verbosity >= (level)) Report(__VA_ARGS__); \
+    if ((uptr)Verbosity() >= (level)) Report(__VA_ARGS__); \
   } while (0)
 #define VPrintf(level, ...)                                              \
   do {                                                                   \
-    if ((uptr)common_flags()->verbosity >= (level)) Printf(__VA_ARGS__); \
+    if ((uptr)Verbosity() >= (level)) Printf(__VA_ARGS__); \
   } while (0)
 
 // Can be used to prevent mixing error reports from different sanitizers.
@@ -179,8 +190,8 @@ uptr OpenFile(const char *filename, bool write);
 // The resulting buffer is mmaped and stored in '*buff'.
 // The size of the mmaped region is stored in '*buff_size',
 // Returns the number of read bytes or 0 if file can not be opened.
-uptr ReadFileToBuffer(const char *file_name, char **buff,
-                      uptr *buff_size, uptr max_len);
+uptr ReadFileToBuffer(const char *file_name, char **buff, uptr *buff_size,
+                      uptr max_len, int *errno_p = nullptr);
 // Maps given file to virtual memory, and returns pointer to it
 // (or NULL if the mapping failes). Stores the size of mmaped region
 // in '*buff_size'.
@@ -214,10 +225,13 @@ void PrepareForSandboxing(__sanitizer_sandbox_arguments *args);
 void CovPrepareForSandboxing(__sanitizer_sandbox_arguments *args);
 void SetSandboxingCallback(void (*f)());
 
-void CovUpdateMapping(uptr caller_pc = 0);
+void CoverageUpdateMapping();
 void CovBeforeFork();
 void CovAfterFork(int child_pid);
 
+void InitializeCoverage(bool enabled, const char *coverage_dir);
+void ReInitializeCoverage(bool enabled, const char *coverage_dir);
+
 void InitTlsSize();
 uptr GetTlsSize();
 
@@ -245,11 +259,18 @@ bool SanitizerGetThreadName(char *name, int max_len);
 // to do tool-specific job.
 typedef void (*DieCallbackType)(void);
 void SetDieCallback(DieCallbackType);
+void SetUserDieCallback(DieCallbackType);
 DieCallbackType GetDieCallback();
 typedef void (*CheckFailedCallbackType)(const char *, int, const char *,
                                        u64, u64);
 void SetCheckFailedCallback(CheckFailedCallbackType callback);
 
+// Callback will be called if soft_rss_limit_mb is given and the limit is
+// exceeded (exceeded==true) or if rss went down below the limit
+// (exceeded==false).
+// The callback should be registered once at the tool init time.
+void SetSoftRssLimitExceededCallback(void (*Callback)(bool exceeded));
+
 // Functions related to signal handling.
 typedef void (*SignalHandlerType)(int, void *, void *);
 bool IsDeadlySignal(int signum);
@@ -376,14 +397,14 @@ INLINE int ToLower(int c) {
 // small vectors.
 // WARNING: The current implementation supports only POD types.
 template<typename T>
-class InternalMmapVector {
+class InternalMmapVectorNoCtor {
  public:
-  explicit InternalMmapVector(uptr initial_capacity) {
+  void Initialize(uptr initial_capacity) {
     capacity_ = Max(initial_capacity, (uptr)1);
     size_ = 0;
-    data_ = (T *)MmapOrDie(capacity_ * sizeof(T), "InternalMmapVector");
+    data_ = (T *)MmapOrDie(capacity_ * sizeof(T), "InternalMmapVectorNoCtor");
   }
-  ~InternalMmapVector() {
+  void Destroy() {
     UnmapOrDie(data_, capacity_ * sizeof(T));
   }
   T &operator[](uptr i) {
@@ -434,15 +455,24 @@ class InternalMmapVector {
     UnmapOrDie(old_data, capacity_ * sizeof(T));
     capacity_ = new_capacity;
   }
-  // Disallow evil constructors.
-  InternalMmapVector(const InternalMmapVector&);
-  void operator=(const InternalMmapVector&);
 
   T *data_;
   uptr capacity_;
   uptr size_;
 };
 
+template<typename T>
+class InternalMmapVector : public InternalMmapVectorNoCtor<T> {
+ public:
+  explicit InternalMmapVector(uptr initial_capacity) {
+    InternalMmapVectorNoCtor<T>::Initialize(initial_capacity);
+  }
+  ~InternalMmapVector() { InternalMmapVectorNoCtor<T>::Destroy(); }
+  // Disallow evil constructors.
+  InternalMmapVector(const InternalMmapVector&);
+  void operator=(const InternalMmapVector&);
+};
+
 // HeapSort for arrays and InternalMmapVector.
 template<class Container, class Compare>
 void InternalSort(Container *v, uptr size, Compare comp) {
@@ -501,28 +531,30 @@ uptr InternalBinarySearch(const Container &v, uptr first, uptr last,
 class LoadedModule {
  public:
   LoadedModule(const char *module_name, uptr base_address);
+  void clear();
   void addAddressRange(uptr beg, uptr end, bool executable);
   bool containsAddress(uptr address) const;
 
   const char *full_name() const { return full_name_; }
   uptr base_address() const { return base_address_; }
 
-  uptr n_ranges() const { return n_ranges_; }
-  uptr address_range_start(int i) const { return ranges_[i].beg; }
-  uptr address_range_end(int i) const { return ranges_[i].end; }
-  bool address_range_executable(int i) const { return exec_[i]; }
-
- private:
   struct AddressRange {
+    AddressRange *next;
     uptr beg;
     uptr end;
+    bool executable;
+
+    AddressRange(uptr beg, uptr end, bool executable)
+        : next(nullptr), beg(beg), end(end), executable(executable) {}
   };
-  char *full_name_;
+
+  typedef IntrusiveList<AddressRange>::ConstIterator Iterator;
+  Iterator ranges() const { return Iterator(&ranges_); }
+
+ private:
+  char *full_name_;  // Owned.
   uptr base_address_;
-  static const uptr kMaxNumberOfAddressRanges = 6;
-  AddressRange ranges_[kMaxNumberOfAddressRanges];
-  bool exec_[kMaxNumberOfAddressRanges];
-  uptr n_ranges_;
+  IntrusiveList<AddressRange> ranges_;
 };
 
 // OS-dependent function that fills array with descriptions of at most
@@ -556,6 +588,10 @@ INLINE void GetExtraActivationFlags(char *buf, uptr size) { *buf = '\0'; }
 INLINE void SanitizerInitializeUnwinder() {}
 #endif
 
+void *internal_start_thread(void(*func)(void*), void *arg);
+void internal_join_thread(void *th);
+void MaybeStartBackgroudThread();
+
 // Make the compiler think that something is going on there.
 // Use this inside a loop that looks like memset/memcpy/etc to prevent the
 // compiler from recognising it and turning it into an actual call to
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
index 274e87c3d67d..87c33e186320 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -17,6 +17,7 @@
 //   COMMON_INTERCEPTOR_READ_RANGE
 //   COMMON_INTERCEPTOR_WRITE_RANGE
 //   COMMON_INTERCEPTOR_INITIALIZE_RANGE
+//   COMMON_INTERCEPTOR_DIR_ACQUIRE
 //   COMMON_INTERCEPTOR_FD_ACQUIRE
 //   COMMON_INTERCEPTOR_FD_RELEASE
 //   COMMON_INTERCEPTOR_FD_ACCESS
@@ -43,6 +44,8 @@
 
 #if SANITIZER_FREEBSD
 #define pthread_setname_np pthread_set_name_np
+#define inet_aton __inet_aton
+#define inet_pton __inet_pton
 #endif
 
 #ifndef COMMON_INTERCEPTOR_INITIALIZE_RANGE
@@ -82,7 +85,7 @@
 #endif
 
 #ifndef COMMON_INTERCEPTOR_LIBRARY_LOADED
-#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, map) {}
+#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) {}
 #endif
 
 #ifndef COMMON_INTERCEPTOR_LIBRARY_UNLOADED
@@ -915,6 +918,16 @@ INTERCEPTOR(int, vsnprintf, char *str, SIZE_T size, const char *format,
             va_list ap)
 VSNPRINTF_INTERCEPTOR_IMPL(vsnprintf, str, size, format, ap)
 
+#if SANITIZER_INTERCEPT_PRINTF_L
+INTERCEPTOR(int, vsnprintf_l, char *str, SIZE_T size, void *loc,
+            const char *format, va_list ap)
+VSNPRINTF_INTERCEPTOR_IMPL(vsnprintf_l, str, size, loc, format, ap)
+
+INTERCEPTOR(int, snprintf_l, char *str, SIZE_T size, void *loc,
+            const char *format, ...)
+FORMAT_INTERCEPTOR_IMPL(snprintf_l, vsnprintf_l, str, size, loc, format)
+#endif  // SANITIZER_INTERCEPT_PRINTF_L
+
 INTERCEPTOR(int, vsprintf, char *str, const char *format, va_list ap)
 VSPRINTF_INTERCEPTOR_IMPL(vsprintf, str, format, ap)
 
@@ -991,6 +1004,14 @@ FORMAT_INTERCEPTOR_IMPL(__isoc99_snprintf, __isoc99_vsnprintf, str, size,
 #define INIT_PRINTF
 #endif
 
+#if SANITIZER_INTERCEPT_PRINTF_L
+#define INIT_PRINTF_L                     \
+  COMMON_INTERCEPT_FUNCTION(snprintf_l);  \
+  COMMON_INTERCEPT_FUNCTION(vsnprintf_l);
+#else
+#define INIT_PRINTF_L
+#endif
+
 #if SANITIZER_INTERCEPT_ISOC99_PRINTF
 #define INIT_ISOC99_PRINTF                       \
   COMMON_INTERCEPT_FUNCTION(__isoc99_printf);    \
@@ -1007,8 +1028,12 @@ FORMAT_INTERCEPTOR_IMPL(__isoc99_snprintf, __isoc99_vsnprintf, str, size,
 
 #if SANITIZER_INTERCEPT_IOCTL
 #include "sanitizer_common_interceptors_ioctl.inc"
-INTERCEPTOR(int, ioctl, int d, unsigned request, void *arg) {
+INTERCEPTOR(int, ioctl, int d, unsigned long request, ...) {
   void *ctx;
+  va_list ap;
+  va_start(ap, request);
+  void *arg = va_arg(ap, void *);
+  va_end(ap);
   COMMON_INTERCEPTOR_ENTER(ctx, ioctl, d, request, arg);
 
   CHECK(ioctl_initialized);
@@ -1017,6 +1042,10 @@ INTERCEPTOR(int, ioctl, int d, unsigned request, void *arg) {
   // This effectively disables ioctl handling in TSan.
   if (!common_flags()->handle_ioctl) return REAL(ioctl)(d, request, arg);
 
+  // Although request is unsigned long, the rest of the interceptor uses it
+  // as just "unsigned" to save space, because we know that all values fit in
+  // "unsigned" - they are compile-time constants.
+
   const ioctl_desc *desc = ioctl_lookup(request);
   ioctl_desc decoded_desc;
   if (!desc) {
@@ -2139,6 +2168,16 @@ INTERCEPTOR(int, sysinfo, void *info) {
 #endif
 
 #if SANITIZER_INTERCEPT_READDIR
+INTERCEPTOR(__sanitizer_dirent *, opendir, const char *path) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, opendir, path);
+  COMMON_INTERCEPTOR_READ_RANGE(ctx, path, REAL(strlen)(path) + 1);
+  __sanitizer_dirent *res = REAL(opendir)(path);
+  if (res != 0)
+    COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path);
+  return res;
+}
+
 INTERCEPTOR(__sanitizer_dirent *, readdir, void *dirp) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, readdir, dirp);
@@ -2167,6 +2206,7 @@ INTERCEPTOR(int, readdir_r, void *dirp, __sanitizer_dirent *entry,
 }
 
 #define INIT_READDIR                  \
+  COMMON_INTERCEPT_FUNCTION(opendir); \
   COMMON_INTERCEPT_FUNCTION(readdir); \
   COMMON_INTERCEPT_FUNCTION(readdir_r);
 #else
@@ -2560,6 +2600,19 @@ INTERCEPTOR(int, sched_getaffinity, int pid, SIZE_T cpusetsize, void *mask) {
 #define INIT_SCHED_GETAFFINITY
 #endif
 
+#if SANITIZER_INTERCEPT_SCHED_GETPARAM
+INTERCEPTOR(int, sched_getparam, int pid, void *param) {
+  void *ctx;
+  COMMON_INTERCEPTOR_ENTER(ctx, sched_getparam, pid, param);
+  int res = REAL(sched_getparam)(pid, param);
+  if (!res) COMMON_INTERCEPTOR_WRITE_RANGE(ctx, param, struct_sched_param_sz);
+  return res;
+}
+#define INIT_SCHED_GETPARAM COMMON_INTERCEPT_FUNCTION(sched_getparam);
+#else
+#define INIT_SCHED_GETPARAM
+#endif
+
 #if SANITIZER_INTERCEPT_STRERROR
 INTERCEPTOR(char *, strerror, int errnum) {
   void *ctx;
@@ -3868,6 +3921,12 @@ INTERCEPTOR(__sanitizer_clock_t, times, void *tms) {
 
 #if SANITIZER_INTERCEPT_TLS_GET_ADDR
 #define INIT_TLS_GET_ADDR COMMON_INTERCEPT_FUNCTION(__tls_get_addr)
+// If you see any crashes around this functions, there are 2 known issues with
+// it: 1. __tls_get_addr can be called with mis-aligned stack due to:
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
+// 2. It can be called recursively if sanitizer code uses __tls_get_addr
+// to access thread local variables (it should not happen normally,
+// because sanitizers use initial-exec tls model).
 INTERCEPTOR(void *, __tls_get_addr, void *arg) {
   void *ctx;
   COMMON_INTERCEPTOR_ENTER(ctx, __tls_get_addr, arg);
@@ -4762,6 +4821,7 @@ static void InitializeCommonInterceptors() {
   INIT_SCANF;
   INIT_ISOC99_SCANF;
   INIT_PRINTF;
+  INIT_PRINTF_L;
   INIT_ISOC99_PRINTF;
   INIT_FREXP;
   INIT_FREXPF_FREXPL;
@@ -4812,6 +4872,7 @@ static void InitializeCommonInterceptors() {
   INIT_CANONICALIZE_FILE_NAME;
   INIT_CONFSTR;
   INIT_SCHED_GETAFFINITY;
+  INIT_SCHED_GETPARAM;
   INIT_STRERROR;
   INIT_STRERROR_R;
   INIT_XPG_STRERROR_R;
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common_libcdep.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common_libcdep.cc
index 20c1d5a78987..e357e1cbbfc9 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common_libcdep.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_common_libcdep.cc
@@ -13,6 +13,7 @@
 
 #include "sanitizer_common.h"
 #include "sanitizer_flags.h"
+#include "sanitizer_stackdepot.h"
 #include "sanitizer_stacktrace.h"
 #include "sanitizer_symbolizer.h"
 
@@ -59,6 +60,71 @@ void ReportErrorSummary(const char *error_type, StackTrace *stack) {
 #endif
 }
 
+static void (*SoftRssLimitExceededCallback)(bool exceeded);
+void SetSoftRssLimitExceededCallback(void (*Callback)(bool exceeded)) {
+  CHECK_EQ(SoftRssLimitExceededCallback, nullptr);
+  SoftRssLimitExceededCallback = Callback;
+}
+
+void BackgroundThread(void *arg) {
+  uptr hard_rss_limit_mb = common_flags()->hard_rss_limit_mb;
+  uptr soft_rss_limit_mb = common_flags()->soft_rss_limit_mb;
+  uptr prev_reported_rss = 0;
+  uptr prev_reported_stack_depot_size = 0;
+  bool reached_soft_rss_limit = false;
+  while (true) {
+    SleepForMillis(100);
+    uptr current_rss_mb = GetRSS() >> 20;
+    if (Verbosity()) {
+      // If RSS has grown 10% since last time, print some information.
+      if (prev_reported_rss * 11 / 10 < current_rss_mb) {
+        Printf("%s: RSS: %zdMb\n", SanitizerToolName, current_rss_mb);
+        prev_reported_rss = current_rss_mb;
+      }
+      // If stack depot has grown 10% since last time, print it too.
+      StackDepotStats *stack_depot_stats = StackDepotGetStats();
+      if (prev_reported_stack_depot_size * 11 / 10 <
+          stack_depot_stats->allocated) {
+        Printf("%s: StackDepot: %zd ids; %zdM allocated\n",
+               SanitizerToolName,
+               stack_depot_stats->n_uniq_ids,
+               stack_depot_stats->allocated >> 20);
+        prev_reported_stack_depot_size = stack_depot_stats->allocated;
+      }
+    }
+    // Check RSS against the limit.
+    if (hard_rss_limit_mb && hard_rss_limit_mb < current_rss_mb) {
+      Report("%s: hard rss limit exhausted (%zdMb vs %zdMb)\n",
+             SanitizerToolName, hard_rss_limit_mb, current_rss_mb);
+      DumpProcessMap();
+      Die();
+    }
+    if (soft_rss_limit_mb) {
+      if (soft_rss_limit_mb < current_rss_mb && !reached_soft_rss_limit) {
+        reached_soft_rss_limit = true;
+        Report("%s: soft rss limit exhausted (%zdMb vs %zdMb)\n",
+               SanitizerToolName, soft_rss_limit_mb, current_rss_mb);
+        if (SoftRssLimitExceededCallback)
+          SoftRssLimitExceededCallback(true);
+      } else if (soft_rss_limit_mb >= current_rss_mb &&
+                 reached_soft_rss_limit) {
+        reached_soft_rss_limit = false;
+        if (SoftRssLimitExceededCallback)
+          SoftRssLimitExceededCallback(false);
+      }
+    }
+  }
+}
+
+void MaybeStartBackgroudThread() {
+  if (!SANITIZER_LINUX) return;  // Need to implement/test on other platforms.
+  // Start the background thread if one of the rss limits is given.
+  if (!common_flags()->hard_rss_limit_mb &&
+      !common_flags()->soft_rss_limit_mb) return;
+  if (!real_pthread_create) return;  // Can't spawn the thread anyway.
+  internal_start_thread(BackgroundThread, nullptr);
+}
+
 }  // namespace __sanitizer
 
 void NOINLINE
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_coverage_libcdep.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_coverage_libcdep.cc
index 3fa8a18696f8..e8f42f68a42f 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_coverage_libcdep.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_coverage_libcdep.cc
@@ -12,14 +12,16 @@
 //
 // Compiler instrumentation:
 // For every interesting basic block the compiler injects the following code:
-// if (Guard) {
+// if (Guard < 0) {
 //    __sanitizer_cov(&Guard);
 // }
+// At the module start up time __sanitizer_cov_module_init sets the guards
+// to consecutive negative numbers (-1, -2, -3, ...).
 // It's fine to call __sanitizer_cov more than once for a given block.
 //
 // Run-time:
 //  - __sanitizer_cov(): record that we've executed the PC (GET_CALLER_PC).
-//    and atomically set Guard to 1.
+//    and atomically set Guard to -Guard.
 //  - __sanitizer_cov_dump: dump the coverage data to disk.
 //  For every module of the current process that has coverage data
 //  this will create a file module_name.PID.sancov. The file format is simple:
@@ -56,23 +58,32 @@ static atomic_uintptr_t coverage_counter;
 static bool cov_sandboxed = false;
 static int cov_fd = kInvalidFd;
 static unsigned int cov_max_block_size = 0;
+static bool coverage_enabled = false;
+static const char *coverage_dir;
 
 namespace __sanitizer {
 
 class CoverageData {
  public:
   void Init();
+  void Enable();
+  void Disable();
+  void ReInit();
   void BeforeFork();
   void AfterFork(int child_pid);
   void Extend(uptr npcs);
-  void Add(uptr pc, u8 *guard);
+  void Add(uptr pc, u32 *guard);
   void IndirCall(uptr caller, uptr callee, uptr callee_cache[],
                  uptr cache_size);
   void DumpCallerCalleePairs();
   void DumpTrace();
 
   ALWAYS_INLINE
-  void TraceBasicaBlock(uptr *cache);
+  void TraceBasicBlock(s32 *id);
+
+  void InitializeGuardArray(s32 *guards);
+  void InitializeGuards(s32 *guards, uptr n);
+  void ReinitializeGuards();
 
   uptr *data();
   uptr size();
@@ -80,7 +91,7 @@ class CoverageData {
  private:
   // Maximal size pc array may ever grow.
   // We MmapNoReserve this space to ensure that the array is contiguous.
-  static const uptr kPcArrayMaxSize = FIRST_32_SECOND_64(1 << 22, 1 << 27);
+  static const uptr kPcArrayMaxSize = FIRST_32_SECOND_64(1 << 24, 1 << 27);
   // The amount file mapping for the pc array is grown by.
   static const uptr kPcArrayMmapSize = 64 * 1024;
 
@@ -96,45 +107,41 @@ class CoverageData {
   // Descriptor of the file mapped pc array.
   int pc_fd;
 
+  // Vector of coverage guard arrays, protected by mu.
+  InternalMmapVectorNoCtor<s32*> guard_array_vec;
+
   // Caller-Callee (cc) array, size and current index.
   static const uptr kCcArrayMaxSize = FIRST_32_SECOND_64(1 << 18, 1 << 24);
   uptr **cc_array;
   atomic_uintptr_t cc_array_index;
   atomic_uintptr_t cc_array_size;
 
-  // Tracing (tr) pc and event arrays, their size and current index.
+  // Tracing event array, size and current pointer.
   // We record all events (basic block entries) in a global buffer of u32
-  // values. Each such value is an index in the table of TracedPc objects.
+  // values. Each such value is the index in pc_array.
   // So far the tracing is highly experimental:
   //   - not thread-safe;
   //   - does not support long traces;
   //   - not tuned for performance.
-  struct TracedPc {
-    uptr pc;
-    const char *module_name;
-    uptr module_offset;
-  };
   static const uptr kTrEventArrayMaxSize = FIRST_32_SECOND_64(1 << 22, 1 << 30);
   u32 *tr_event_array;
   uptr tr_event_array_size;
-  uptr tr_event_array_index;
+  u32 *tr_event_pointer;
   static const uptr kTrPcArrayMaxSize    = FIRST_32_SECOND_64(1 << 22, 1 << 27);
-  TracedPc *tr_pc_array;
-  uptr tr_pc_array_size;
-  uptr tr_pc_array_index;
 
   StaticSpinMutex mu;
 
   void DirectOpen();
-  void ReInit();
 };
 
 static CoverageData coverage_data;
 
+void CovUpdateMapping(const char *path, uptr caller_pc = 0);
+
 void CoverageData::DirectOpen() {
   InternalScopedString path(kMaxPathLength);
   internal_snprintf((char *)path.data(), path.size(), "%s/%zd.sancov.raw",
-                    common_flags()->coverage_dir, internal_getpid());
+                    coverage_dir, internal_getpid());
   pc_fd = OpenFile(path.data(), true);
   if (internal_iserror(pc_fd)) {
     Report(" Coverage: failed to open %s for writing\n", path.data());
@@ -142,19 +149,23 @@ void CoverageData::DirectOpen() {
   }
 
   pc_array_mapped_size = 0;
-  CovUpdateMapping();
+  CovUpdateMapping(coverage_dir);
 }
 
 void CoverageData::Init() {
+  pc_fd = kInvalidFd;
+}
+
+void CoverageData::Enable() {
+  if (pc_array)
+    return;
   pc_array = reinterpret_cast<uptr *>(
       MmapNoReserveOrDie(sizeof(uptr) * kPcArrayMaxSize, "CovInit"));
-  pc_fd = kInvalidFd;
+  atomic_store(&pc_array_index, 0, memory_order_relaxed);
   if (common_flags()->coverage_direct) {
     atomic_store(&pc_array_size, 0, memory_order_relaxed);
-    atomic_store(&pc_array_index, 0, memory_order_relaxed);
   } else {
     atomic_store(&pc_array_size, kPcArrayMaxSize, memory_order_relaxed);
-    atomic_store(&pc_array_index, 0, memory_order_relaxed);
   }
 
   cc_array = reinterpret_cast<uptr **>(MmapNoReserveOrDie(
@@ -162,30 +173,72 @@ void CoverageData::Init() {
   atomic_store(&cc_array_size, kCcArrayMaxSize, memory_order_relaxed);
   atomic_store(&cc_array_index, 0, memory_order_relaxed);
 
-  tr_event_array = reinterpret_cast<u32 *>(
-      MmapNoReserveOrDie(sizeof(tr_event_array[0]) * kTrEventArrayMaxSize,
-                         "CovInit::tr_event_array"));
+  // Allocate tr_event_array with a guard page at the end.
+  tr_event_array = reinterpret_cast<u32 *>(MmapNoReserveOrDie(
+      sizeof(tr_event_array[0]) * kTrEventArrayMaxSize + GetMmapGranularity(),
+      "CovInit::tr_event_array"));
+  Mprotect(reinterpret_cast<uptr>(&tr_event_array[kTrEventArrayMaxSize]),
+           GetMmapGranularity());
   tr_event_array_size = kTrEventArrayMaxSize;
-  tr_event_array_index = 0;
+  tr_event_pointer = tr_event_array;
+}
 
-  tr_pc_array = reinterpret_cast<TracedPc *>(MmapNoReserveOrDie(
-      sizeof(tr_pc_array[0]) * kTrEventArrayMaxSize, "CovInit::tr_pc_array"));
-  tr_pc_array_size = kTrEventArrayMaxSize;
-  tr_pc_array_index = 0;
+void CoverageData::InitializeGuardArray(s32 *guards) {
+  Enable();  // Make sure coverage is enabled at this point.
+  s32 n = guards[0];
+  for (s32 j = 1; j <= n; j++) {
+    uptr idx = atomic_fetch_add(&pc_array_index, 1, memory_order_relaxed);
+    guards[j] = -static_cast<s32>(idx + 1);
+  }
+}
+
+void CoverageData::Disable() {
+  if (pc_array) {
+    internal_munmap(pc_array, sizeof(uptr) * kPcArrayMaxSize);
+    pc_array = nullptr;
+  }
+  if (cc_array) {
+    internal_munmap(cc_array, sizeof(uptr *) * kCcArrayMaxSize);
+    cc_array = nullptr;
+  }
+  if (tr_event_array) {
+    internal_munmap(tr_event_array,
+                    sizeof(tr_event_array[0]) * kTrEventArrayMaxSize +
+                        GetMmapGranularity());
+    tr_event_array = nullptr;
+    tr_event_pointer = nullptr;
+  }
+  if (pc_fd != kInvalidFd) {
+    internal_close(pc_fd);
+    pc_fd = kInvalidFd;
+  }
+}
+
+void CoverageData::ReinitializeGuards() {
+  // Assuming single thread.
+  atomic_store(&pc_array_index, 0, memory_order_relaxed);
+  for (uptr i = 0; i < guard_array_vec.size(); i++)
+    InitializeGuardArray(guard_array_vec[i]);
 }
 
 void CoverageData::ReInit() {
-  internal_munmap(pc_array, sizeof(uptr) * kPcArrayMaxSize);
-  if (pc_fd != kInvalidFd) internal_close(pc_fd);
-  if (common_flags()->coverage_direct) {
-    // In memory-mapped mode we must extend the new file to the known array
-    // size.
-    uptr size = atomic_load(&pc_array_size, memory_order_relaxed);
-    Init();
-    if (size) Extend(size);
-  } else {
-    Init();
+  Disable();
+  if (coverage_enabled) {
+    if (common_flags()->coverage_direct) {
+      // In memory-mapped mode we must extend the new file to the known array
+      // size.
+      uptr size = atomic_load(&pc_array_size, memory_order_relaxed);
+      Enable();
+      if (size) Extend(size);
+      if (coverage_enabled) CovUpdateMapping(coverage_dir);
+    } else {
+      Enable();
+    }
   }
+  // Re-initialize the guards.
+  // We are single-threaded now, no need to grab any lock.
+  CHECK_EQ(atomic_load(&pc_array_index, memory_order_relaxed), 0);
+  ReinitializeGuards();
 }
 
 void CoverageData::BeforeFork() {
@@ -203,15 +256,16 @@ void CoverageData::Extend(uptr npcs) {
   if (!common_flags()->coverage_direct) return;
   SpinMutexLock l(&mu);
 
-  if (pc_fd == kInvalidFd) DirectOpen();
-  CHECK_NE(pc_fd, kInvalidFd);
-
   uptr size = atomic_load(&pc_array_size, memory_order_relaxed);
   size += npcs * sizeof(uptr);
 
-  if (size > pc_array_mapped_size) {
+  if (coverage_enabled && size > pc_array_mapped_size) {
+    if (pc_fd == kInvalidFd) DirectOpen();
+    CHECK_NE(pc_fd, kInvalidFd);
+
     uptr new_mapped_size = pc_array_mapped_size;
     while (size > new_mapped_size) new_mapped_size += kPcArrayMmapSize;
+    CHECK_LE(new_mapped_size, sizeof(uptr) * kPcArrayMaxSize);
 
     // Extend the file and map the new space at the end of pc_array.
     uptr res = internal_ftruncate(pc_fd, new_mapped_size);
@@ -220,29 +274,45 @@ void CoverageData::Extend(uptr npcs) {
       Printf("failed to extend raw coverage file: %d\n", err);
       Die();
     }
-    void *p = MapWritableFileToMemory(pc_array + pc_array_mapped_size,
+
+    uptr next_map_base = ((uptr)pc_array) + pc_array_mapped_size;
+    void *p = MapWritableFileToMemory((void *)next_map_base,
                                       new_mapped_size - pc_array_mapped_size,
                                       pc_fd, pc_array_mapped_size);
-    CHECK_EQ(p, pc_array + pc_array_mapped_size);
+    CHECK_EQ((uptr)p, next_map_base);
     pc_array_mapped_size = new_mapped_size;
   }
 
   atomic_store(&pc_array_size, size, memory_order_release);
 }
 
-// Atomically add the pc to the vector. The atomically set the guard to 1.
-// If the function is called more than once for a given PC it will
-// be inserted multiple times, which is fine.
-void CoverageData::Add(uptr pc, u8 *guard) {
+void CoverageData::InitializeGuards(s32 *guards, uptr n) {
+  // The array 'guards' has n+1 elements, we use the element zero
+  // to store 'n'.
+  CHECK_LT(n, 1 << 30);
+  guards[0] = static_cast<s32>(n);
+  InitializeGuardArray(guards);
+  SpinMutexLock l(&mu);
+  guard_array_vec.push_back(guards);
+}
+
+// If guard is negative, atomically set it to -guard and store the PC in
+// pc_array.
+void CoverageData::Add(uptr pc, u32 *guard) {
+  atomic_uint32_t *atomic_guard = reinterpret_cast<atomic_uint32_t*>(guard);
+  s32 guard_value = atomic_load(atomic_guard, memory_order_relaxed);
+  if (guard_value >= 0) return;
+
+  atomic_store(atomic_guard, -guard_value, memory_order_relaxed);
   if (!pc_array) return;
-  uptr idx = atomic_fetch_add(&pc_array_index, 1, memory_order_relaxed);
+
+  uptr idx = -guard_value - 1;
+  if (idx >= atomic_load(&pc_array_index, memory_order_acquire))
+    return;  // May happen after fork when pc_array_index becomes 0.
   CHECK_LT(idx * sizeof(uptr),
            atomic_load(&pc_array_size, memory_order_acquire));
   pc_array[idx] = pc;
   atomic_fetch_add(&coverage_counter, 1, memory_order_relaxed);
-  // Set the guard.
-  atomic_uint8_t *atomic_guard = reinterpret_cast<atomic_uint8_t*>(guard);
-  atomic_store(atomic_guard, 1, memory_order_relaxed);
 }
 
 // Registers a pair caller=>callee.
@@ -338,18 +408,19 @@ static void CovWritePacked(int pid, const char *module, const void *blob,
 // If packed = true and name == 0: <pid>.<sancov>.<packed>.
 // If packed = true and name != 0: <name>.<sancov>.<packed> (name is
 // user-supplied).
-static int CovOpenFile(bool packed, const char* name) {
+static int CovOpenFile(bool packed, const char *name,
+                       const char *extension = "sancov") {
   InternalScopedString path(kMaxPathLength);
   if (!packed) {
     CHECK(name);
-    path.append("%s/%s.%zd.sancov", common_flags()->coverage_dir, name,
-                internal_getpid());
+    path.append("%s/%s.%zd.%s", coverage_dir, name, internal_getpid(),
+                extension);
   } else {
     if (!name)
-      path.append("%s/%zd.sancov.packed", common_flags()->coverage_dir,
-                  internal_getpid());
+      path.append("%s/%zd.%s.packed", coverage_dir, internal_getpid(),
+                  extension);
     else
-      path.append("%s/%s.sancov.packed", common_flags()->coverage_dir, name);
+      path.append("%s/%s.%s.packed", coverage_dir, name, extension);
   }
   uptr fd = OpenFile(path.data(), true);
   if (internal_iserror(fd)) {
@@ -361,23 +432,18 @@ static int CovOpenFile(bool packed, const char* name) {
 
 // Dump trace PCs and trace events into two separate files.
 void CoverageData::DumpTrace() {
-  uptr max_idx = tr_event_array_index;
+  uptr max_idx = tr_event_pointer - tr_event_array;
   if (!max_idx) return;
   auto sym = Symbolizer::GetOrInit();
   if (!sym)
     return;
   InternalScopedString out(32 << 20);
-  for (uptr i = 0; i < max_idx; i++) {
-    u32 pc_idx = tr_event_array[i];
-    TracedPc *t = &tr_pc_array[pc_idx];
-    if (!t->module_name) {
-      const char *module_name = "<unknown>";
-      uptr module_address = 0;
-      sym->GetModuleNameAndOffsetForPC(t->pc, &module_name, &module_address);
-      t->module_name = internal_strdup(module_name);
-      t->module_offset = module_address;
-      out.append("%s 0x%zx\n", t->module_name, t->module_offset);
-    }
+  for (uptr i = 0, n = size(); i < n; i++) {
+    const char *module_name = "<unknown>";
+    uptr module_address = 0;
+    sym->GetModuleNameAndOffsetForPC(pc_array[i], &module_name,
+                                     &module_address);
+    out.append("%s 0x%zx\n", module_name, module_address);
   }
   int fd = CovOpenFile(false, "trace-points");
   if (fd < 0) return;
@@ -386,10 +452,21 @@ void CoverageData::DumpTrace() {
 
   fd = CovOpenFile(false, "trace-events");
   if (fd < 0) return;
-  internal_write(fd, tr_event_array, max_idx * sizeof(tr_event_array[0]));
+  uptr bytes_to_write = max_idx * sizeof(tr_event_array[0]);
+  u8 *event_bytes = reinterpret_cast<u8*>(tr_event_array);
+  // The trace file could be huge, and may not be written with a single syscall.
+  while (bytes_to_write) {
+    uptr actually_written = internal_write(fd, event_bytes, bytes_to_write);
+    if (actually_written <= bytes_to_write) {
+      bytes_to_write -= actually_written;
+      event_bytes += actually_written;
+    } else {
+      break;
+    }
+  }
   internal_close(fd);
-  VReport(1, " CovDump: Trace: %zd PCs written\n", tr_pc_array_index);
-  VReport(1, " CovDump: Trace: %zd Events written\n", tr_event_array_index);
+  VReport(1, " CovDump: Trace: %zd PCs written\n", size());
+  VReport(1, " CovDump: Trace: %zd Events written\n", max_idx);
 }
 
 // This function dumps the caller=>callee pairs into a file as a sequence of
@@ -434,28 +511,45 @@ void CoverageData::DumpCallerCalleePairs() {
 // Record the current PC into the event buffer.
 // Every event is a u32 value (index in tr_pc_array_index) so we compute
 // it once and then cache in the provided 'cache' storage.
-void CoverageData::TraceBasicaBlock(uptr *cache) {
-  CHECK(common_flags()->coverage);
-  uptr idx = *cache;
-  if (!idx) {
-    CHECK_LT(tr_pc_array_index, kTrPcArrayMaxSize);
-    idx = tr_pc_array_index++;
-    TracedPc *t = &tr_pc_array[idx];
-    t->pc = GET_CALLER_PC();
-    *cache = idx;
-    CHECK_LT(idx, 1U << 31);
+//
+// This function will eventually be inlined by the compiler.
+void CoverageData::TraceBasicBlock(s32 *id) {
+  // Will trap here if
+  //  1. coverage is not enabled at run-time.
+  //  2. The array tr_event_array is full.
+  *tr_event_pointer = static_cast<u32>(*id - 1);
+  tr_event_pointer++;
+}
+
+static void CovDumpAsBitSet() {
+  if (!common_flags()->coverage_bitset) return;
+  if (!coverage_data.size()) return;
+  int fd = CovOpenFile(/* packed */false, "combined", "bitset-sancov");
+  if (fd < 0) return;
+  uptr n = coverage_data.size();
+  uptr n_set_bits = 0;
+  InternalScopedBuffer<char> out(n);
+  for (uptr i = 0; i < n; i++) {
+    uptr pc = coverage_data.data()[i];
+    out[i] = pc ? '1' : '0';
+    if (pc)
+      n_set_bits++;
   }
-  CHECK_LT(tr_event_array_index, tr_event_array_size);
-  tr_event_array[tr_event_array_index] = static_cast<u32>(idx);
-  tr_event_array_index++;
+  internal_write(fd, out.data(), n);
+  internal_close(fd);
+  VReport(1, " CovDump: bitset of %zd bits written, %zd bits are set\n", n,
+          n_set_bits);
 }
 
 // Dump the coverage on disk.
 static void CovDump() {
-  if (!common_flags()->coverage || common_flags()->coverage_direct) return;
+  if (!coverage_enabled || common_flags()->coverage_direct) return;
 #if !SANITIZER_WINDOWS
   if (atomic_fetch_add(&dump_once_guard, 1, memory_order_relaxed))
     return;
+  CovDumpAsBitSet();
+  coverage_data.DumpTrace();
+  if (!common_flags()->coverage_pcs) return;
   uptr size = coverage_data.size();
   InternalMmapVector<u32> offsets(size);
   uptr *vb = coverage_data.data();
@@ -491,8 +585,8 @@ static void CovDump() {
       } else {
         // One file per module per process.
         path.clear();
-        path.append("%s/%s.%zd.sancov", common_flags()->coverage_dir,
-                    module_name, internal_getpid());
+        path.append("%s/%s.%zd.sancov", coverage_dir, module_name,
+                    internal_getpid());
         int fd = CovOpenFile(false /* packed */, module_name);
         if (fd > 0) {
           internal_write(fd, offsets.data(), offsets.size() * sizeof(u32));
@@ -506,13 +600,12 @@ static void CovDump() {
   if (cov_fd >= 0)
     internal_close(cov_fd);
   coverage_data.DumpCallerCalleePairs();
-  coverage_data.DumpTrace();
 #endif  // !SANITIZER_WINDOWS
 }
 
 void CovPrepareForSandboxing(__sanitizer_sandbox_arguments *args) {
   if (!args) return;
-  if (!common_flags()->coverage) return;
+  if (!coverage_enabled) return;
   cov_sandboxed = args->coverage_sandboxed;
   if (!cov_sandboxed) return;
   cov_fd = args->coverage_fd;
@@ -524,7 +617,7 @@ void CovPrepareForSandboxing(__sanitizer_sandbox_arguments *args) {
 
 int MaybeOpenCovFile(const char *name) {
   CHECK(name);
-  if (!common_flags()->coverage) return -1;
+  if (!coverage_enabled) return -1;
   return CovOpenFile(true /* packed */, name);
 }
 
@@ -536,28 +629,60 @@ void CovAfterFork(int child_pid) {
   coverage_data.AfterFork(child_pid);
 }
 
+void InitializeCoverage(bool enabled, const char *dir) {
+  if (coverage_enabled)
+    return;  // May happen if two sanitizer enable coverage in the same process.
+  coverage_enabled = enabled;
+  coverage_dir = dir;
+  coverage_data.Init();
+  if (enabled) coverage_data.Enable();
+#if !SANITIZER_WINDOWS
+  if (!common_flags()->coverage_direct) Atexit(__sanitizer_cov_dump);
+#endif
+}
+
+void ReInitializeCoverage(bool enabled, const char *dir) {
+  coverage_enabled = enabled;
+  coverage_dir = dir;
+  coverage_data.ReInit();
+}
+
+void CoverageUpdateMapping() {
+  if (coverage_enabled)
+    CovUpdateMapping(coverage_dir);
+}
+
 }  // namespace __sanitizer
 
 extern "C" {
-SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov(u8 *guard) {
+SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov(u32 *guard) {
   coverage_data.Add(StackTrace::GetPreviousInstructionPc(GET_CALLER_PC()),
                     guard);
 }
+SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_with_check(u32 *guard) {
+  atomic_uint32_t *atomic_guard = reinterpret_cast<atomic_uint32_t*>(guard);
+  if (__sanitizer::atomic_load(atomic_guard, memory_order_relaxed))
+    __sanitizer_cov(guard);
+}
 SANITIZER_INTERFACE_ATTRIBUTE void
 __sanitizer_cov_indir_call16(uptr callee, uptr callee_cache16[]) {
   coverage_data.IndirCall(StackTrace::GetPreviousInstructionPc(GET_CALLER_PC()),
                           callee, callee_cache16, 16);
 }
-SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_dump() { CovDump(); }
 SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_init() {
+  coverage_enabled = true;
+  coverage_dir = common_flags()->coverage_dir;
   coverage_data.Init();
 }
-SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_module_init(uptr npcs) {
-  if (!common_flags()->coverage || !common_flags()->coverage_direct) return;
-  if (SANITIZER_ANDROID) {
+SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_dump() { CovDump(); }
+SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_module_init(s32 *guards,
+                                                               uptr npcs) {
+  coverage_data.InitializeGuards(guards, npcs);
+  if (!common_flags()->coverage_direct) return;
+  if (SANITIZER_ANDROID && coverage_enabled) {
     // dlopen/dlclose interceptors do not work on Android, so we rely on
     // Extend() calls to update .sancov.map.
-    CovUpdateMapping(GET_CALLER_PC());
+    CovUpdateMapping(coverage_dir, GET_CALLER_PC());
   }
   coverage_data.Extend(npcs);
 }
@@ -571,11 +696,23 @@ uptr __sanitizer_get_total_unique_coverage() {
 }
 
 SANITIZER_INTERFACE_ATTRIBUTE
-void __sanitizer_cov_trace_func_enter(uptr *cache) {
-  coverage_data.TraceBasicaBlock(cache);
+void __sanitizer_cov_trace_func_enter(s32 *id) {
+  coverage_data.TraceBasicBlock(id);
+}
+SANITIZER_INTERFACE_ATTRIBUTE
+void __sanitizer_cov_trace_basic_block(s32 *id) {
+  coverage_data.TraceBasicBlock(id);
+}
+SANITIZER_INTERFACE_ATTRIBUTE
+void __sanitizer_reset_coverage() {
+  coverage_data.ReinitializeGuards();
+  internal_bzero_aligned16(
+      coverage_data.data(),
+      RoundUpTo(coverage_data.size() * sizeof(coverage_data.data()[0]), 16));
 }
 SANITIZER_INTERFACE_ATTRIBUTE
-void __sanitizer_cov_trace_basic_block(uptr *cache) {
-  coverage_data.TraceBasicaBlock(cache);
+uptr __sanitizer_get_coverage_guards(uptr **data) {
+  *data = coverage_data.data();
+  return coverage_data.size();
 }
 }  // extern "C"
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_coverage_mapping_libcdep.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_coverage_mapping_libcdep.cc
index fe72d06a2fb1..6b5e91fbc018 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_coverage_mapping_libcdep.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_coverage_mapping_libcdep.cc
@@ -62,8 +62,8 @@ struct CachedMapping {
 static CachedMapping cached_mapping;
 static StaticSpinMutex mapping_mu;
 
-void CovUpdateMapping(uptr caller_pc) {
-  if (!common_flags()->coverage || !common_flags()->coverage_direct) return;
+void CovUpdateMapping(const char *coverage_dir, uptr caller_pc) {
+  if (!common_flags()->coverage_direct) return;
 
   SpinMutexLock l(&mapping_mu);
 
@@ -71,36 +71,41 @@ void CovUpdateMapping(uptr caller_pc) {
     return;
 
   InternalScopedString text(kMaxTextSize);
-  InternalScopedBuffer<LoadedModule> modules(kMaxNumberOfModules);
-  CHECK(modules.data());
-  int n_modules = GetListOfModules(modules.data(), kMaxNumberOfModules,
-                                   /* filter */ 0);
-
-  text.append("%d\n", sizeof(uptr) * 8);
-  for (int i = 0; i < n_modules; ++i) {
-    const char *module_name = StripModuleName(modules[i].full_name());
-    for (unsigned j = 0; j < modules[i].n_ranges(); ++j) {
-      if (modules[i].address_range_executable(j)) {
-        uptr start = modules[i].address_range_start(j);
-        uptr end = modules[i].address_range_end(j);
-        uptr base = modules[i].base_address();
-        text.append("%zx %zx %zx %s\n", start, end, base, module_name);
-        if (caller_pc && caller_pc >= start && caller_pc < end)
-          cached_mapping.SetModuleRange(start, end);
+
+  {
+    InternalScopedBuffer<LoadedModule> modules(kMaxNumberOfModules);
+    CHECK(modules.data());
+    int n_modules = GetListOfModules(modules.data(), kMaxNumberOfModules,
+                                     /* filter */ 0);
+
+    text.append("%d\n", sizeof(uptr) * 8);
+    for (int i = 0; i < n_modules; ++i) {
+      const char *module_name = StripModuleName(modules[i].full_name());
+      uptr base = modules[i].base_address();
+      for (auto iter = modules[i].ranges(); iter.hasNext();) {
+        const auto *range = iter.next();
+        if (range->executable) {
+          uptr start = range->beg;
+          uptr end = range->end;
+          text.append("%zx %zx %zx %s\n", start, end, base, module_name);
+          if (caller_pc && caller_pc >= start && caller_pc < end)
+            cached_mapping.SetModuleRange(start, end);
+        }
       }
+      modules[i].clear();
     }
   }
 
   int err;
-  InternalScopedString tmp_path(64 +
-                                internal_strlen(common_flags()->coverage_dir));
+  InternalScopedString tmp_path(64 + internal_strlen(coverage_dir));
   uptr res = internal_snprintf((char *)tmp_path.data(), tmp_path.size(),
-                    "%s/%zd.sancov.map.tmp", common_flags()->coverage_dir,
-                    internal_getpid());
+                               "%s/%zd.sancov.map.tmp", coverage_dir,
+                               internal_getpid());
   CHECK_LE(res, tmp_path.size());
   uptr map_fd = OpenFile(tmp_path.data(), true);
-  if (internal_iserror(map_fd)) {
-    Report(" Coverage: failed to open %s for writing\n", tmp_path.data());
+  if (internal_iserror(map_fd, &err)) {
+    Report(" Coverage: failed to open %s for writing: %d\n", tmp_path.data(),
+           err);
     Die();
   }
 
@@ -111,9 +116,9 @@ void CovUpdateMapping(uptr caller_pc) {
   }
   internal_close(map_fd);
 
-  InternalScopedString path(64 + internal_strlen(common_flags()->coverage_dir));
+  InternalScopedString path(64 + internal_strlen(coverage_dir));
   res = internal_snprintf((char *)path.data(), path.size(), "%s/%zd.sancov.map",
-                    common_flags()->coverage_dir, internal_getpid());
+                          coverage_dir, internal_getpid());
   CHECK_LE(res, path.size());
   res = internal_rename(tmp_path.data(), path.data());
   if (internal_iserror(res, &err)) {
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_deadlock_detector.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_deadlock_detector.h
index 90e1cc4eb597..86d5743e9794 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_deadlock_detector.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_deadlock_detector.h
@@ -50,6 +50,8 @@ class DeadlockDetectorTLS {
     if (epoch_ == current_epoch) return;
     bv_.clear();
     epoch_ = current_epoch;
+    n_recursive_locks = 0;
+    n_all_locks_ = 0;
   }
 
   uptr getEpoch() const { return epoch_; }
@@ -83,7 +85,8 @@ class DeadlockDetectorTLS {
       }
     }
     // Printf("remLock: %zx %zx\n", lock_id, epoch_);
-    CHECK(bv_.clearBit(lock_id));
+    if (!bv_.clearBit(lock_id))
+      return;  // probably addLock happened before flush
     if (n_all_locks_) {
       for (sptr i = n_all_locks_ - 1; i >= 0; i--) {
         if (all_locks_with_contexts_[i].lock == static_cast<u32>(lock_id)) {
@@ -175,6 +178,7 @@ class DeadlockDetector {
     recycled_nodes_.clear();
     available_nodes_.setAll();
     g_.clear();
+    n_edges_ = 0;
     return getAvailableNode(data);
   }
 
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flag_parser.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flag_parser.cc
new file mode 100644
index 000000000000..d125002daf4c
--- /dev/null
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flag_parser.cc
@@ -0,0 +1,153 @@
+//===-- sanitizer_flag_parser.cc ------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of ThreadSanitizer/AddressSanitizer runtime.
+//
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_flag_parser.h"
+
+#include "sanitizer_common.h"
+#include "sanitizer_libc.h"
+#include "sanitizer_flags.h"
+#include "sanitizer_flag_parser.h"
+
+namespace __sanitizer {
+
+LowLevelAllocator FlagParser::Alloc;
+
+class UnknownFlags {
+  static const int kMaxUnknownFlags = 20;
+  const char *unknown_flags_[kMaxUnknownFlags];
+  int n_unknown_flags_;
+
+ public:
+  void Add(const char *name) {
+    CHECK_LT(n_unknown_flags_, kMaxUnknownFlags);
+    unknown_flags_[n_unknown_flags_++] = name;
+  }
+
+  void Report() {
+    if (!n_unknown_flags_) return;
+    Printf("WARNING: found %d unrecognized flag(s):\n", n_unknown_flags_);
+    for (int i = 0; i < n_unknown_flags_; ++i)
+      Printf("    %s\n", unknown_flags_[i]);
+    n_unknown_flags_ = 0;
+  }
+};
+
+UnknownFlags unknown_flags;
+
+void ReportUnrecognizedFlags() {
+  unknown_flags.Report();
+}
+
+char *FlagParser::ll_strndup(const char *s, uptr n) {
+  uptr len = internal_strnlen(s, n);
+  char *s2 = (char*)Alloc.Allocate(len + 1);
+  internal_memcpy(s2, s, len);
+  s2[len] = 0;
+  return s2;
+}
+
+void FlagParser::PrintFlagDescriptions() {
+  Printf("Available flags for %s:\n", SanitizerToolName);
+  for (int i = 0; i < n_flags_; ++i)
+    Printf("\t%s\n\t\t- %s\n", flags_[i].name, flags_[i].desc);
+}
+
+void FlagParser::fatal_error(const char *err) {
+  Printf("ERROR: %s\n", err);
+  Die();
+}
+
+bool FlagParser::is_space(char c) {
+  return c == ' ' || c == ',' || c == ':' || c == '\n' || c == '\t' ||
+         c == '\r';
+}
+
+void FlagParser::skip_whitespace() {
+  while (is_space(buf_[pos_])) ++pos_;
+}
+
+void FlagParser::parse_flag() {
+  uptr name_start = pos_;
+  while (buf_[pos_] != 0 && buf_[pos_] != '=' && !is_space(buf_[pos_])) ++pos_;
+  if (buf_[pos_] != '=') fatal_error("expected '='");
+  char *name = ll_strndup(buf_ + name_start, pos_ - name_start);
+
+  uptr value_start = ++pos_;
+  char *value;
+  if (buf_[pos_] == '\'' || buf_[pos_] == '"') {
+    char quote = buf_[pos_++];
+    while (buf_[pos_] != 0 && buf_[pos_] != quote) ++pos_;
+    if (buf_[pos_] == 0) fatal_error("unterminated string");
+    value = ll_strndup(buf_ + value_start + 1, pos_ - value_start - 1);
+    ++pos_; // consume the closing quote
+  } else {
+    while (buf_[pos_] != 0 && !is_space(buf_[pos_])) ++pos_;
+    if (buf_[pos_] != 0 && !is_space(buf_[pos_]))
+      fatal_error("expected separator or eol");
+    value = ll_strndup(buf_ + value_start, pos_ - value_start);
+  }
+
+  bool res = run_handler(name, value);
+  if (!res) fatal_error("Flag parsing failed.");
+}
+
+void FlagParser::parse_flags() {
+  while (true) {
+    skip_whitespace();
+    if (buf_[pos_] == 0) break;
+    parse_flag();
+  }
+
+  // Do a sanity check for certain flags.
+  if (common_flags_dont_use.malloc_context_size < 1)
+    common_flags_dont_use.malloc_context_size = 1;
+}
+
+void FlagParser::ParseString(const char *s) {
+  if (!s) return;
+  // Backup current parser state to allow nested ParseString() calls.
+  const char *old_buf_ = buf_;
+  uptr old_pos_ = pos_;
+  buf_ = s;
+  pos_ = 0;
+
+  parse_flags();
+
+  buf_ = old_buf_;
+  pos_ = old_pos_;
+}
+
+bool FlagParser::run_handler(const char *name, const char *value) {
+  for (int i = 0; i < n_flags_; ++i) {
+    if (internal_strcmp(name, flags_[i].name) == 0)
+      return flags_[i].handler->Parse(value);
+  }
+  // Unrecognized flag. This is not a fatal error, we may print a warning later.
+  unknown_flags.Add(name);
+  return true;
+}
+
+void FlagParser::RegisterHandler(const char *name, FlagHandlerBase *handler,
+                                 const char *desc) {
+  CHECK_LT(n_flags_, kMaxFlags);
+  flags_[n_flags_].name = name;
+  flags_[n_flags_].desc = desc;
+  flags_[n_flags_].handler = handler;
+  ++n_flags_;
+}
+
+FlagParser::FlagParser() : n_flags_(0), buf_(nullptr), pos_(0) {
+  flags_ = (Flag *)Alloc.Allocate(sizeof(Flag) * kMaxFlags);
+}
+
+}  // namespace __sanitizer
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flag_parser.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flag_parser.h
new file mode 100644
index 000000000000..87afb8238c01
--- /dev/null
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flag_parser.h
@@ -0,0 +1,121 @@
+//===-- sanitizer_flag_parser.h ---------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of ThreadSanitizer/AddressSanitizer runtime.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SANITIZER_FLAG_REGISTRY_H
+#define SANITIZER_FLAG_REGISTRY_H
+
+#include "sanitizer_internal_defs.h"
+#include "sanitizer_libc.h"
+#include "sanitizer_common.h"
+
+namespace __sanitizer {
+
+class FlagHandlerBase {
+ public:
+  virtual bool Parse(const char *value) { return false; }
+};
+
+template <typename T>
+class FlagHandler : public FlagHandlerBase {
+  T *t_;
+
+ public:
+  explicit FlagHandler(T *t) : t_(t) {}
+  bool Parse(const char *value);
+};
+
+template <>
+inline bool FlagHandler<bool>::Parse(const char *value) {
+  if (internal_strcmp(value, "0") == 0 ||
+      internal_strcmp(value, "no") == 0 ||
+      internal_strcmp(value, "false") == 0) {
+    *t_ = false;
+    return true;
+  }
+  if (internal_strcmp(value, "1") == 0 ||
+      internal_strcmp(value, "yes") == 0 ||
+      internal_strcmp(value, "true") == 0) {
+    *t_ = true;
+    return true;
+  }
+  Printf("ERROR: Invalid value for bool option: '%s'\n", value);
+  return false;
+}
+
+template <>
+inline bool FlagHandler<const char *>::Parse(const char *value) {
+  *t_ = internal_strdup(value);
+  return true;
+}
+
+template <>
+inline bool FlagHandler<int>::Parse(const char *value) {
+  char *value_end;
+  *t_ = internal_simple_strtoll(value, &value_end, 10);
+  bool ok = *value_end == 0;
+  if (!ok) Printf("ERROR: Invalid value for int option: '%s'\n", value);
+  return ok;
+}
+
+template <>
+inline bool FlagHandler<uptr>::Parse(const char *value) {
+  char *value_end;
+  *t_ = internal_simple_strtoll(value, &value_end, 10);
+  bool ok = *value_end == 0;
+  if (!ok) Printf("ERROR: Invalid value for uptr option: '%s'\n", value);
+  return ok;
+}
+
+class FlagParser {
+  static const int kMaxFlags = 200;
+  struct Flag {
+    const char *name;
+    const char *desc;
+    FlagHandlerBase *handler;
+  } *flags_;
+  int n_flags_;
+
+  const char *buf_;
+  uptr pos_;
+
+ public:
+  FlagParser();
+  void RegisterHandler(const char *name, FlagHandlerBase *handler,
+                       const char *desc);
+  void ParseString(const char *s);
+  void PrintFlagDescriptions();
+
+  static LowLevelAllocator Alloc;
+
+ private:
+  void fatal_error(const char *err);
+  bool is_space(char c);
+  void skip_whitespace();
+  void parse_flags();
+  void parse_flag();
+  bool run_handler(const char *name, const char *value);
+  char *ll_strndup(const char *s, uptr n);
+};
+
+template <typename T>
+static void RegisterFlag(FlagParser *parser, const char *name, const char *desc,
+                         T *var) {
+  FlagHandler<T> *fh = new (FlagParser::Alloc) FlagHandler<T>(var);  // NOLINT
+  parser->RegisterHandler(name, fh, desc);
+}
+
+void ReportUnrecognizedFlags();
+
+}  // namespace __sanitizer
+
+#endif  // SANITIZER_FLAG_REGISTRY_H
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flags.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flags.cc
index 40b6ec067150..a2965351cf2a 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flags.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flags.cc
@@ -16,6 +16,7 @@
 #include "sanitizer_common.h"
 #include "sanitizer_libc.h"
 #include "sanitizer_list.h"
+#include "sanitizer_flag_parser.h"
 
 namespace __sanitizer {
 
@@ -34,274 +35,53 @@ IntrusiveList<FlagDescription> flag_descriptions;
 # define SANITIZER_NEEDS_SEGV 1
 #endif
 
-void SetCommonFlagsDefaults(CommonFlags *f) {
-  f->symbolize = true;
-  f->external_symbolizer_path = 0;
-  f->allow_addr2line = false;
-  f->strip_path_prefix = "";
-  f->fast_unwind_on_check = false;
-  f->fast_unwind_on_fatal = false;
-  f->fast_unwind_on_malloc = true;
-  f->handle_ioctl = false;
-  f->malloc_context_size = 1;
-  f->log_path = "stderr";
-  f->verbosity = 0;
-  f->detect_leaks = true;
-  f->leak_check_at_exit = true;
-  f->allocator_may_return_null = false;
-  f->print_summary = true;
-  f->check_printf = true;
-  // TODO(glider): tools may want to set different defaults for handle_segv.
-  f->handle_segv = SANITIZER_NEEDS_SEGV;
-  f->allow_user_segv_handler = false;
-  f->use_sigaltstack = true;
-  f->detect_deadlocks = false;
-  f->clear_shadow_mmap_threshold = 64 * 1024;
-  f->color = "auto";
-  f->legacy_pthread_cond = false;
-  f->intercept_tls_get_addr = false;
-  f->coverage = false;
-  f->coverage_direct = SANITIZER_ANDROID;
-  f->coverage_dir = ".";
-  f->full_address_space = false;
-  f->suppressions = "";
-  f->print_suppressions = true;
-  f->disable_coredump = (SANITIZER_WORDSIZE == 64);
-  f->symbolize_inline_frames = true;
-  f->stack_trace_format = "DEFAULT";
+void CommonFlags::SetDefaults() {
+#define COMMON_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
+#include "sanitizer_flags.inc"
+#undef COMMON_FLAG
 }
 
-void ParseCommonFlagsFromString(CommonFlags *f, const char *str) {
-  ParseFlag(str, &f->symbolize, "symbolize",
-      "If set, use the online symbolizer from common sanitizer runtime to turn "
-      "virtual addresses to file/line locations.");
-  ParseFlag(str, &f->external_symbolizer_path, "external_symbolizer_path",
-      "Path to external symbolizer. If empty, the tool will search $PATH for "
-      "the symbolizer.");
-  ParseFlag(str, &f->allow_addr2line, "allow_addr2line",
-      "If set, allows online symbolizer to run addr2line binary to symbolize "
-      "stack traces (addr2line will only be used if llvm-symbolizer binary is "
-      "unavailable.");
-  ParseFlag(str, &f->strip_path_prefix, "strip_path_prefix",
-      "Strips this prefix from file paths in error reports.");
-  ParseFlag(str, &f->fast_unwind_on_check, "fast_unwind_on_check",
-      "If available, use the fast frame-pointer-based unwinder on "
-      "internal CHECK failures.");
-  ParseFlag(str, &f->fast_unwind_on_fatal, "fast_unwind_on_fatal",
-      "If available, use the fast frame-pointer-based unwinder on fatal "
-      "errors.");
-  ParseFlag(str, &f->fast_unwind_on_malloc, "fast_unwind_on_malloc",
-      "If available, use the fast frame-pointer-based unwinder on "
-      "malloc/free.");
-  ParseFlag(str, &f->handle_ioctl, "handle_ioctl",
-      "Intercept and handle ioctl requests.");
-  ParseFlag(str, &f->malloc_context_size, "malloc_context_size",
-      "Max number of stack frames kept for each allocation/deallocation.");
-  ParseFlag(str, &f->log_path, "log_path",
-      "Write logs to \"log_path.pid\". The special values are \"stdout\" and "
-      "\"stderr\". The default is \"stderr\".");
-  ParseFlag(str, &f->verbosity, "verbosity",
-      "Verbosity level (0 - silent, 1 - a bit of output, 2+ - more output).");
-  ParseFlag(str, &f->detect_leaks, "detect_leaks",
-      "Enable memory leak detection.");
-  ParseFlag(str, &f->leak_check_at_exit, "leak_check_at_exit",
-      "Invoke leak checking in an atexit handler. Has no effect if "
-      "detect_leaks=false, or if __lsan_do_leak_check() is called before the "
-      "handler has a chance to run.");
-  ParseFlag(str, &f->allocator_may_return_null, "allocator_may_return_null",
-      "If false, the allocator will crash instead of returning 0 on "
-      "out-of-memory.");
-  ParseFlag(str, &f->print_summary, "print_summary",
-      "If false, disable printing error summaries in addition to error "
-      "reports.");
-  ParseFlag(str, &f->check_printf, "check_printf",
-      "Check printf arguments.");
-  ParseFlag(str, &f->handle_segv, "handle_segv",
-      "If set, registers the tool's custom SEGV handler (both SIGBUS and "
-      "SIGSEGV on OSX).");
-  ParseFlag(str, &f->allow_user_segv_handler, "allow_user_segv_handler",
-      "If set, allows user to register a SEGV handler even if the tool "
-      "registers one.");
-  ParseFlag(str, &f->use_sigaltstack, "use_sigaltstack",
-      "If set, uses alternate stack for signal handling.");
-  ParseFlag(str, &f->detect_deadlocks, "detect_deadlocks",
-      "If set, deadlock detection is enabled.");
-  ParseFlag(str, &f->clear_shadow_mmap_threshold,
-            "clear_shadow_mmap_threshold",
-      "Large shadow regions are zero-filled using mmap(NORESERVE) instead of "
-      "memset(). This is the threshold size in bytes.");
-  ParseFlag(str, &f->color, "color",
-      "Colorize reports: (always|never|auto).");
-  ParseFlag(str, &f->legacy_pthread_cond, "legacy_pthread_cond",
-      "Enables support for dynamic libraries linked with libpthread 2.2.5.");
-  ParseFlag(str, &f->intercept_tls_get_addr, "intercept_tls_get_addr",
-            "Intercept __tls_get_addr.");
-  ParseFlag(str, &f->help, "help", "Print the flag descriptions.");
-  ParseFlag(str, &f->mmap_limit_mb, "mmap_limit_mb",
-            "Limit the amount of mmap-ed memory (excluding shadow) in Mb; "
-            "not a user-facing flag, used mosly for testing the tools");
-  ParseFlag(str, &f->coverage, "coverage",
-      "If set, coverage information will be dumped at program shutdown (if the "
-      "coverage instrumentation was enabled at compile time).");
-  ParseFlag(str, &f->coverage_direct, "coverage_direct",
-            "If set, coverage information will be dumped directly to a memory "
-            "mapped file. This way data is not lost even if the process is "
-            "suddenly killed.");
-  ParseFlag(str, &f->coverage_dir, "coverage_dir",
-            "Target directory for coverage dumps. Defaults to the current "
-            "directory.");
-  ParseFlag(str, &f->full_address_space, "full_address_space",
-            "Sanitize complete address space; "
-            "by default kernel area on 32-bit platforms will not be sanitized");
-  ParseFlag(str, &f->suppressions, "suppressions", "Suppressions file name.");
-  ParseFlag(str, &f->print_suppressions, "print_suppressions",
-            "Print matched suppressions at exit.");
-  ParseFlag(str, &f->disable_coredump, "disable_coredump",
-      "Disable core dumping. By default, disable_core=1 on 64-bit to avoid "
-      "dumping a 16T+ core file. Ignored on OSes that don't dump core by"
-      "default and for sanitizers that don't reserve lots of virtual memory.");
-  ParseFlag(str, &f->symbolize_inline_frames, "symbolize_inline_frames",
-            "Print inlined frames in stacktraces. Defaults to true.");
-  ParseFlag(str, &f->stack_trace_format, "stack_trace_format",
-            "Format string used to render stack frames. "
-            "See sanitizer_stacktrace_printer.h for the format description. "
-            "Use DEFAULT to get default format.");
-
-  // Do a sanity check for certain flags.
-  if (f->malloc_context_size < 1)
-    f->malloc_context_size = 1;
+void CommonFlags::CopyFrom(const CommonFlags &other) {
+  internal_memcpy(this, &other, sizeof(*this));
 }
 
-static bool GetFlagValue(const char *env, const char *name,
-                         const char **value, int *value_length) {
-  if (env == 0)
-    return false;
-  const char *pos = 0;
-  for (;;) {
-    pos = internal_strstr(env, name);
-    if (pos == 0)
+class FlagHandlerInclude : public FlagHandlerBase {
+  static const uptr kMaxIncludeSize = 1 << 15;
+  FlagParser *parser_;
+
+ public:
+  explicit FlagHandlerInclude(FlagParser *parser) : parser_(parser) {}
+  bool Parse(const char *value) {
+    char *data;
+    uptr data_mapped_size;
+    int err;
+    uptr len =
+      ReadFileToBuffer(value, &data, &data_mapped_size,
+                       Max(kMaxIncludeSize, GetPageSizeCached()), &err);
+    if (!len) {
+      Printf("Failed to read options from '%s': error %d\n", value, err);
       return false;
-    const char *name_end = pos + internal_strlen(name);
-    if ((pos != env &&
-         ((pos[-1] >= 'a' && pos[-1] <= 'z') || pos[-1] == '_')) ||
-        *name_end != '=') {
-      // Seems to be middle of another flag name or value.
-      env = pos + 1;
-      continue;
-    }
-    pos = name_end;
-    break;
-  }
-  const char *end;
-  if (pos[0] != '=') {
-    end = pos;
-  } else {
-    pos += 1;
-    if (pos[0] == '"') {
-      pos += 1;
-      end = internal_strchr(pos, '"');
-    } else if (pos[0] == '\'') {
-      pos += 1;
-      end = internal_strchr(pos, '\'');
-    } else {
-      // Read until the next space or colon.
-      end = pos + internal_strcspn(pos, " :");
     }
-    if (end == 0)
-      end = pos + internal_strlen(pos);
-  }
-  *value = pos;
-  *value_length = end - pos;
-  return true;
-}
-
-static bool StartsWith(const char *flag, int flag_length, const char *value) {
-  if (!flag || !value)
-    return false;
-  int value_length = internal_strlen(value);
-  return (flag_length >= value_length) &&
-         (0 == internal_strncmp(flag, value, value_length));
-}
-
-static LowLevelAllocator allocator_for_flags;
-
-// The linear scan is suboptimal, but the number of flags is relatively small.
-bool FlagInDescriptionList(const char *name) {
-  IntrusiveList<FlagDescription>::Iterator it(&flag_descriptions);
-  while (it.hasNext()) {
-    if (!internal_strcmp(it.next()->name, name)) return true;
+    parser_->ParseString(data);
+    UnmapOrDie(data, data_mapped_size);
+    return true;
   }
-  return false;
-}
-
-void AddFlagDescription(const char *name, const char *description) {
-  if (FlagInDescriptionList(name)) return;
-  FlagDescription *new_description = new(allocator_for_flags) FlagDescription;
-  new_description->name = name;
-  new_description->description = description;
-  flag_descriptions.push_back(new_description);
-}
-
-// TODO(glider): put the descriptions inside CommonFlags.
-void PrintFlagDescriptions() {
-  IntrusiveList<FlagDescription>::Iterator it(&flag_descriptions);
-  Printf("Available flags for %s:\n", SanitizerToolName);
-  while (it.hasNext()) {
-    FlagDescription *descr = it.next();
-    Printf("\t%s\n\t\t- %s\n", descr->name, descr->description);
-  }
-}
-
-void ParseFlag(const char *env, bool *flag,
-               const char *name, const char *descr) {
-  const char *value;
-  int value_length;
-  AddFlagDescription(name, descr);
-  if (!GetFlagValue(env, name, &value, &value_length))
-    return;
-  if (StartsWith(value, value_length, "0") ||
-      StartsWith(value, value_length, "no") ||
-      StartsWith(value, value_length, "false"))
-    *flag = false;
-  if (StartsWith(value, value_length, "1") ||
-      StartsWith(value, value_length, "yes") ||
-      StartsWith(value, value_length, "true"))
-    *flag = true;
-}
+};
 
-void ParseFlag(const char *env, int *flag,
-               const char *name, const char *descr) {
-  const char *value;
-  int value_length;
-  AddFlagDescription(name, descr);
-  if (!GetFlagValue(env, name, &value, &value_length))
-    return;
-  *flag = static_cast<int>(internal_atoll(value));
+void RegisterIncludeFlag(FlagParser *parser, CommonFlags *cf) {
+  FlagHandlerInclude *fh_include =
+      new (FlagParser::Alloc) FlagHandlerInclude(parser);  // NOLINT
+  parser->RegisterHandler("include", fh_include,
+                          "read more options from the given file");
 }
 
-void ParseFlag(const char *env, uptr *flag,
-               const char *name, const char *descr) {
-  const char *value;
-  int value_length;
-  AddFlagDescription(name, descr);
-  if (!GetFlagValue(env, name, &value, &value_length))
-    return;
-  *flag = static_cast<uptr>(internal_atoll(value));
-}
+void RegisterCommonFlags(FlagParser *parser, CommonFlags *cf) {
+#define COMMON_FLAG(Type, Name, DefaultValue, Description) \
+  RegisterFlag(parser, #Name, Description, &cf->Name);
+#include "sanitizer_flags.inc"
+#undef COMMON_FLAG
 
-void ParseFlag(const char *env, const char **flag,
-               const char *name, const char *descr) {
-  const char *value;
-  int value_length;
-  AddFlagDescription(name, descr);
-  if (!GetFlagValue(env, name, &value, &value_length))
-    return;
-  // Copy the flag value. Don't use locks here, as flags are parsed at
-  // tool startup.
-  char *value_copy = (char*)(allocator_for_flags.Allocate(value_length + 1));
-  internal_memcpy(value_copy, value, value_length);
-  value_copy[value_length] = '\0';
-  *flag = value_copy;
+  RegisterIncludeFlag(parser, cf);
 }
 
 }  // namespace __sanitizer
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flags.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flags.h
index 4791397a5761..fda6d710757e 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flags.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flags.h
@@ -18,62 +18,38 @@
 
 namespace __sanitizer {
 
-void ParseFlag(const char *env, bool *flag,
-    const char *name, const char *descr);
-void ParseFlag(const char *env, int *flag,
-    const char *name, const char *descr);
-void ParseFlag(const char *env, uptr *flag,
-    const char *name, const char *descr);
-void ParseFlag(const char *env, const char **flag,
-    const char *name, const char *descr);
-
 struct CommonFlags {
-  bool symbolize;
-  const char *external_symbolizer_path;
-  bool allow_addr2line;
-  const char *strip_path_prefix;
-  bool fast_unwind_on_check;
-  bool fast_unwind_on_fatal;
-  bool fast_unwind_on_malloc;
-  bool handle_ioctl;
-  int malloc_context_size;
-  const char *log_path;
-  int  verbosity;
-  bool detect_leaks;
-  bool leak_check_at_exit;
-  bool allocator_may_return_null;
-  bool print_summary;
-  bool check_printf;
-  bool handle_segv;
-  bool allow_user_segv_handler;
-  bool use_sigaltstack;
-  bool detect_deadlocks;
-  uptr clear_shadow_mmap_threshold;
-  const char *color;
-  bool legacy_pthread_cond;
-  bool intercept_tls_get_addr;
-  bool help;
-  uptr mmap_limit_mb;
-  bool coverage;
-  bool coverage_direct;
-  const char *coverage_dir;
-  bool full_address_space;
-  const char *suppressions;
-  bool print_suppressions;
-  bool disable_coredump;
-  bool symbolize_inline_frames;
-  const char *stack_trace_format;
+#define COMMON_FLAG(Type, Name, DefaultValue, Description) Type Name;
+#include "sanitizer_flags.inc"
+#undef COMMON_FLAG
+
+  void SetDefaults();
+  void CopyFrom(const CommonFlags &other);
 };
 
-inline CommonFlags *common_flags() {
-  extern CommonFlags common_flags_dont_use;
+// Functions to get/set global CommonFlags shared by all sanitizer runtimes:
+extern CommonFlags common_flags_dont_use;
+inline const CommonFlags *common_flags() {
   return &common_flags_dont_use;
 }
 
-void SetCommonFlagsDefaults(CommonFlags *f);
-void ParseCommonFlagsFromString(CommonFlags *f, const char *str);
-void PrintFlagDescriptions();
+inline void SetCommonFlagsDefaults() {
+  common_flags_dont_use.SetDefaults();
+}
+
+// This function can only be used to setup tool-specific overrides for
+// CommonFlags defaults. Generally, it should only be used right after
+// SetCommonFlagsDefaults(), but before ParseCommonFlagsFromString(), and
+// only during the flags initialization (i.e. before they are used for
+// the first time).
+inline void OverrideCommonFlags(const CommonFlags &cf) {
+  common_flags_dont_use.CopyFrom(cf);
+}
 
+class FlagParser;
+void RegisterCommonFlags(FlagParser *parser,
+                         CommonFlags *cf = &common_flags_dont_use);
+void RegisterIncludeFlag(FlagParser *parser, CommonFlags *cf);
 }  // namespace __sanitizer
 
 #endif  // SANITIZER_FLAGS_H
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flags.inc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flags.inc
new file mode 100644
index 000000000000..e8c8a87537d7
--- /dev/null
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_flags.inc
@@ -0,0 +1,149 @@
+//===-- sanitizer_flags.h ---------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file describes common flags available in all sanitizers.
+//
+//===----------------------------------------------------------------------===//
+#ifndef COMMON_FLAG
+#error "Define COMMON_FLAG prior to including this file!"
+#endif
+
+// COMMON_FLAG(Type, Name, DefaultValue, Description)
+// Supported types: bool, const char *, int, uptr.
+// Default value must be a compile-time constant.
+// Description must be a string literal.
+
+COMMON_FLAG(
+    bool, symbolize, true,
+    "If set, use the online symbolizer from common sanitizer runtime to turn "
+    "virtual addresses to file/line locations.")
+COMMON_FLAG(
+    const char *, external_symbolizer_path, 0,
+    "Path to external symbolizer. If empty, the tool will search $PATH for "
+    "the symbolizer.")
+COMMON_FLAG(
+    bool, allow_addr2line, false,
+    "If set, allows online symbolizer to run addr2line binary to symbolize "
+    "stack traces (addr2line will only be used if llvm-symbolizer binary is "
+    "unavailable.")
+COMMON_FLAG(const char *, strip_path_prefix, "",
+            "Strips this prefix from file paths in error reports.")
+COMMON_FLAG(bool, fast_unwind_on_check, false,
+            "If available, use the fast frame-pointer-based unwinder on "
+            "internal CHECK failures.")
+COMMON_FLAG(bool, fast_unwind_on_fatal, false,
+            "If available, use the fast frame-pointer-based unwinder on fatal "
+            "errors.")
+COMMON_FLAG(bool, fast_unwind_on_malloc, true,
+            "If available, use the fast frame-pointer-based unwinder on "
+            "malloc/free.")
+COMMON_FLAG(bool, handle_ioctl, false, "Intercept and handle ioctl requests.")
+COMMON_FLAG(int, malloc_context_size, 1,
+            "Max number of stack frames kept for each allocation/deallocation.")
+COMMON_FLAG(
+    const char *, log_path, "stderr",
+    "Write logs to \"log_path.pid\". The special values are \"stdout\" and "
+    "\"stderr\". The default is \"stderr\".")
+COMMON_FLAG(
+    int, verbosity, 0,
+    "Verbosity level (0 - silent, 1 - a bit of output, 2+ - more output).")
+COMMON_FLAG(bool, detect_leaks, true, "Enable memory leak detection.")
+COMMON_FLAG(
+    bool, leak_check_at_exit, true,
+    "Invoke leak checking in an atexit handler. Has no effect if "
+    "detect_leaks=false, or if __lsan_do_leak_check() is called before the "
+    "handler has a chance to run.")
+COMMON_FLAG(bool, allocator_may_return_null, false,
+            "If false, the allocator will crash instead of returning 0 on "
+            "out-of-memory.")
+COMMON_FLAG(bool, print_summary, true,
+            "If false, disable printing error summaries in addition to error "
+            "reports.")
+COMMON_FLAG(bool, check_printf, true, "Check printf arguments.")
+COMMON_FLAG(bool, handle_segv, SANITIZER_NEEDS_SEGV,
+            "If set, registers the tool's custom SEGV handler (both SIGBUS and "
+            "SIGSEGV on OSX).")
+COMMON_FLAG(bool, allow_user_segv_handler, false,
+            "If set, allows user to register a SEGV handler even if the tool "
+            "registers one.")
+COMMON_FLAG(bool, use_sigaltstack, true,
+            "If set, uses alternate stack for signal handling.")
+COMMON_FLAG(bool, detect_deadlocks, false,
+            "If set, deadlock detection is enabled.")
+COMMON_FLAG(
+    uptr, clear_shadow_mmap_threshold, 64 * 1024,
+    "Large shadow regions are zero-filled using mmap(NORESERVE) instead of "
+    "memset(). This is the threshold size in bytes.")
+COMMON_FLAG(const char *, color, "auto",
+            "Colorize reports: (always|never|auto).")
+COMMON_FLAG(
+    bool, legacy_pthread_cond, false,
+    "Enables support for dynamic libraries linked with libpthread 2.2.5.")
+COMMON_FLAG(bool, intercept_tls_get_addr, false, "Intercept __tls_get_addr.")
+COMMON_FLAG(bool, help, false, "Print the flag descriptions.")
+COMMON_FLAG(uptr, mmap_limit_mb, 0,
+            "Limit the amount of mmap-ed memory (excluding shadow) in Mb; "
+            "not a user-facing flag, used mosly for testing the tools")
+COMMON_FLAG(uptr, hard_rss_limit_mb, 0,
+            "Hard RSS limit in Mb."
+            " If non-zero, a background thread is spawned at startup"
+            " which periodically reads RSS and aborts the process if the"
+            " limit is reached")
+COMMON_FLAG(uptr, soft_rss_limit_mb, 0,
+            "Soft RSS limit in Mb."
+            " If non-zero, a background thread is spawned at startup"
+            " which periodically reads RSS. If the limit is reached"
+            " all subsequent malloc/new calls will fail or return NULL"
+            " (depending on the value of allocator_may_return_null)"
+            " until the RSS goes below the soft limit."
+            " This limit does not affect memory allocations other than"
+            " malloc/new.")
+COMMON_FLAG(bool, can_use_proc_maps_statm, true,
+            "If false, do not attempt to read /proc/maps/statm."
+            " Mostly useful for testing sanitizers.")
+COMMON_FLAG(
+    bool, coverage, false,
+    "If set, coverage information will be dumped at program shutdown (if the "
+    "coverage instrumentation was enabled at compile time).")
+// On by default, but works only if coverage == true.
+COMMON_FLAG(bool, coverage_pcs, true,
+            "If set (and if 'coverage' is set too), the coverage information "
+            "will be dumped as a set of PC offsets for every module.")
+COMMON_FLAG(bool, coverage_bitset, false,
+            "If set (and if 'coverage' is set too), the coverage information "
+            "will also be dumped as a bitset to a separate file.")
+COMMON_FLAG(bool, coverage_direct, SANITIZER_ANDROID,
+            "If set, coverage information will be dumped directly to a memory "
+            "mapped file. This way data is not lost even if the process is "
+            "suddenly killed.")
+COMMON_FLAG(const char *, coverage_dir, ".",
+            "Target directory for coverage dumps. Defaults to the current "
+            "directory.")
+COMMON_FLAG(bool, full_address_space, false,
+            "Sanitize complete address space; "
+            "by default kernel area on 32-bit platforms will not be sanitized")
+COMMON_FLAG(const char *, suppressions, "", "Suppressions file name.")
+COMMON_FLAG(bool, print_suppressions, true,
+            "Print matched suppressions at exit.")
+COMMON_FLAG(
+    bool, disable_coredump, (SANITIZER_WORDSIZE == 64),
+    "Disable core dumping. By default, disable_core=1 on 64-bit to avoid "
+    "dumping a 16T+ core file. Ignored on OSes that don't dump core by"
+    "default and for sanitizers that don't reserve lots of virtual memory.")
+COMMON_FLAG(bool, use_madv_dontdump, true,
+          "If set, instructs kernel to not store the (huge) shadow "
+          "in core file.")
+COMMON_FLAG(bool, symbolize_inline_frames, true,
+            "Print inlined frames in stacktraces. Defaults to true.")
+COMMON_FLAG(const char *, stack_trace_format, "DEFAULT",
+            "Format string used to render stack frames. "
+            "See sanitizer_stacktrace_printer.h for the format description. "
+            "Use DEFAULT to get default format.")
+COMMON_FLAG(bool, no_huge_pages_for_shadow, true,
+            "If true, the shadow is not allowed to use huge pages. ")
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h
index 6f36f97f1c86..2a0b41f0bb99 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h
@@ -15,6 +15,10 @@
 
 #include "sanitizer_platform.h"
 
+#ifndef SANITIZER_DEBUG
+# define SANITIZER_DEBUG 0
+#endif
+
 // Only use SANITIZER_*ATTRIBUTE* before the function return type!
 #if SANITIZER_WINDOWS
 # define SANITIZER_INTERFACE_ATTRIBUTE __declspec(dllexport)
@@ -48,11 +52,6 @@
 # define __has_feature(x) 0
 #endif
 
-// Enable sanitizer compilation for pre-C++11
-#if __cplusplus < 201103L
-#define nullptr 0
-#endif
-
 // For portability reasons we do not include stddef.h, stdint.h or any other
 // system header, but we do need some basic types that are not defined
 // in a portable way by the language itself.
@@ -86,8 +85,9 @@ typedef int fd_t;
 // WARNING: OFF_T may be different from OS type off_t, depending on the value of
 // _FILE_OFFSET_BITS. This definition of OFF_T matches the ABI of system calls
 // like pread and mmap, as opposed to pread64 and mmap64.
-// Mac and Linux/x86-64 are special.
-#if SANITIZER_MAC || (SANITIZER_LINUX && defined(__x86_64__))
+// FreeBSD, Mac and Linux/x86-64 are special.
+#if SANITIZER_FREEBSD || SANITIZER_MAC || \
+  (SANITIZER_LINUX && defined(__x86_64__))
 typedef u64 OFF_T;
 #else
 typedef uptr OFF_T;
@@ -125,7 +125,7 @@ extern "C" {
 
   SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_dump();
   SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov_init();
-  SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov(__sanitizer::u8 *guard);
+  SANITIZER_INTERFACE_ATTRIBUTE void __sanitizer_cov(__sanitizer::u32 *guard);
   SANITIZER_INTERFACE_ATTRIBUTE
   void __sanitizer_annotate_contiguous_container(const void *beg,
                                                  const void *end,
@@ -245,7 +245,7 @@ void NORETURN CheckFailed(const char *file, int line, const char *cond,
 #define CHECK_GT(a, b) CHECK_IMPL((a), >,  (b))
 #define CHECK_GE(a, b) CHECK_IMPL((a), >=, (b))
 
-#if TSAN_DEBUG
+#if SANITIZER_DEBUG
 #define DCHECK(a)       CHECK(a)
 #define DCHECK_EQ(a, b) CHECK_EQ(a, b)
 #define DCHECK_NE(a, b) CHECK_NE(a, b)
@@ -325,4 +325,11 @@ extern "C" void* _ReturnAddress(void);
     } while (internal_iserror(res, &rverrno) && rverrno == EINTR); \
   }
 
+// Forces the compiler to generate a frame pointer in the function.
+#define ENABLE_FRAME_POINTER                                       \
+  do {                                                             \
+    volatile uptr enable_fp;                                       \
+    enable_fp = GET_CURRENT_FRAME();                               \
+  } while (0)
+
 #endif  // SANITIZER_DEFS_H
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_libc.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_libc.cc
index d8bd1cf7a7e0..cb162a4c4984 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_libc.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_libc.cc
@@ -28,6 +28,15 @@ void *internal_memchr(const void *s, int c, uptr n) {
   return 0;
 }
 
+void *internal_memrchr(const void *s, int c, uptr n) {
+  const char *t = (const char *)s;
+  void *res = nullptr;
+  for (uptr i = 0; i < n; ++i, ++t) {
+    if (*t == c) res = reinterpret_cast<void *>(const_cast<char *>(t));
+  }
+  return res;
+}
+
 int internal_memcmp(const void* s1, const void* s2, uptr n) {
   const char *t1 = (const char *)s1;
   const char *t2 = (const char *)s2;
@@ -101,6 +110,14 @@ char* internal_strdup(const char *s) {
   return s2;
 }
 
+char* internal_strndup(const char *s, uptr n) {
+  uptr len = internal_strnlen(s, n);
+  char *s2 = (char*)InternalAlloc(len + 1);
+  internal_memcpy(s2, s, len);
+  s2[len] = 0;
+  return s2;
+}
+
 int internal_strcmp(const char *s1, const char *s2) {
   while (true) {
     unsigned c1 = *s1;
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_libc.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_libc.h
index 6995626821ab..c086b8a9139e 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_libc.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_libc.h
@@ -26,6 +26,7 @@ namespace __sanitizer {
 // String functions
 s64 internal_atoll(const char *nptr);
 void *internal_memchr(const void *s, int c, uptr n);
+void *internal_memrchr(const void *s, int c, uptr n);
 int internal_memcmp(const void* s1, const void* s2, uptr n);
 void *internal_memcpy(void *dest, const void *src, uptr n);
 void *internal_memmove(void *dest, const void *src, uptr n);
@@ -38,6 +39,7 @@ char *internal_strchrnul(const char *s, int c);
 int internal_strcmp(const char *s1, const char *s2);
 uptr internal_strcspn(const char *s, const char *reject);
 char *internal_strdup(const char *s);
+char *internal_strndup(const char *s, uptr n);
 uptr internal_strlen(const char *s);
 char *internal_strncat(char *dst, const char *src, uptr n);
 int internal_strncmp(const char *s1, const char *s2, uptr n);
@@ -98,6 +100,25 @@ int internal_fork();
 // Threading
 uptr internal_sched_yield();
 
+// These functions call appropriate pthread_ functions directly, bypassing
+// the interceptor. They are weak and may not be present in some tools.
+SANITIZER_WEAK_ATTRIBUTE
+int real_pthread_create(void *th, void *attr, void *(*callback)(void *),
+                        void *param);
+SANITIZER_WEAK_ATTRIBUTE
+int real_pthread_join(void *th, void **ret);
+
+#define DEFINE_REAL_PTHREAD_FUNCTIONS                                          \
+  namespace __sanitizer {                                                      \
+  int real_pthread_create(void *th, void *attr, void *(*callback)(void *),     \
+                          void *param) {                                       \
+    return REAL(pthread_create)(th, attr, callback, param);                    \
+  }                                                                            \
+  int real_pthread_join(void *th, void **ret) {                                \
+    return REAL(pthread_join(th, ret));                                        \
+  }                                                                            \
+  }  // namespace __sanitizer
+
 // Error handling
 bool internal_iserror(uptr retval, int *rverrno = 0);
 
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc
index 36de1ec70e97..26138ba29d35 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_linux.cc
@@ -31,6 +31,17 @@
 #include <asm/param.h>
 #endif
 
+// For mips64, syscall(__NR_stat) fills the buffer in the 'struct kernel_stat'
+// format. Struct kernel_stat is defined as 'struct stat' in asm/stat.h. To
+// access stat from asm/stat.h, without conflicting with definition in
+// sys/stat.h, we use this trick.
+#if defined(__mips64)
+#include <sys/types.h>
+#define stat kernel_stat
+#include <asm/stat.h>
+#undef stat
+#endif
+
 #include <dlfcn.h>
 #include <errno.h>
 #include <fcntl.h>
@@ -98,14 +109,16 @@ namespace __sanitizer {
 #endif
 
 // --------------- sanitizer_libc.h
-uptr internal_mmap(void *addr, uptr length, int prot, int flags,
-                    int fd, u64 offset) {
+uptr internal_mmap(void *addr, uptr length, int prot, int flags, int fd,
+                   u64 offset) {
 #if SANITIZER_FREEBSD || SANITIZER_LINUX_USES_64BIT_SYSCALLS
   return internal_syscall(SYSCALL(mmap), (uptr)addr, length, prot, flags, fd,
                           offset);
 #else
+  // mmap2 specifies file offset in 4096-byte units.
+  CHECK(IsAligned(offset, 4096));
   return internal_syscall(SYSCALL(mmap2), addr, length, prot, flags, fd,
-                          offset);
+                          offset / 4096);
 #endif
 }
 
@@ -179,6 +192,26 @@ static void stat64_to_stat(struct stat64 *in, struct stat *out) {
 }
 #endif
 
+#if defined(__mips64)
+static void kernel_stat_to_stat(struct kernel_stat *in, struct stat *out) {
+  internal_memset(out, 0, sizeof(*out));
+  out->st_dev = in->st_dev;
+  out->st_ino = in->st_ino;
+  out->st_mode = in->st_mode;
+  out->st_nlink = in->st_nlink;
+  out->st_uid = in->st_uid;
+  out->st_gid = in->st_gid;
+  out->st_rdev = in->st_rdev;
+  out->st_size = in->st_size;
+  out->st_blksize = in->st_blksize;
+  out->st_blocks = in->st_blocks;
+  out->st_atime = in->st_atime_nsec;
+  out->st_mtime = in->st_mtime_nsec;
+  out->st_ctime = in->st_ctime_nsec;
+  out->st_ino = in->st_ino;
+}
+#endif
+
 uptr internal_stat(const char *path, void *buf) {
 #if SANITIZER_FREEBSD
   return internal_syscall(SYSCALL(stat), path, buf);
@@ -186,7 +219,15 @@ uptr internal_stat(const char *path, void *buf) {
   return internal_syscall(SYSCALL(newfstatat), AT_FDCWD, (uptr)path,
                           (uptr)buf, 0);
 #elif SANITIZER_LINUX_USES_64BIT_SYSCALLS
+# if defined(__mips64)
+  // For mips64, stat syscall fills buffer in the format of kernel_stat
+  struct kernel_stat kbuf;
+  int res = internal_syscall(SYSCALL(stat), path, &kbuf);
+  kernel_stat_to_stat(&kbuf, (struct stat *)buf);
+  return res;
+# else
   return internal_syscall(SYSCALL(stat), (uptr)path, (uptr)buf);
+# endif
 #else
   struct stat64 buf64;
   int res = internal_syscall(SYSCALL(stat64), path, &buf64);
@@ -381,33 +422,6 @@ static void ReadNullSepFileToArray(const char *path, char ***arr,
 }
 #endif
 
-uptr GetRSS() {
-  uptr fd = OpenFile("/proc/self/statm", false);
-  if ((sptr)fd < 0)
-    return 0;
-  char buf[64];
-  uptr len = internal_read(fd, buf, sizeof(buf) - 1);
-  internal_close(fd);
-  if ((sptr)len <= 0)
-    return 0;
-  buf[len] = 0;
-  // The format of the file is:
-  // 1084 89 69 11 0 79 0
-  // We need the second number which is RSS in 4K units.
-  char *pos = buf;
-  // Skip the first number.
-  while (*pos >= '0' && *pos <= '9')
-    pos++;
-  // Skip whitespaces.
-  while (!(*pos >= '0' && *pos <= '9') && *pos != 0)
-    pos++;
-  // Read the number.
-  uptr rss = 0;
-  while (*pos >= '0' && *pos <= '9')
-    rss = rss * 10 + *pos++ - '0';
-  return rss * 4096;
-}
-
 static void GetArgsAndEnv(char*** argv, char*** envp) {
 #if !SANITIZER_GO
   if (&__libc_stack_end) {
@@ -435,32 +449,18 @@ void ReExec() {
   Die();
 }
 
-// Stub implementation of GetThreadStackAndTls for Go.
-#if SANITIZER_GO
-void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
-                          uptr *tls_addr, uptr *tls_size) {
-  *stk_addr = 0;
-  *stk_size = 0;
-  *tls_addr = 0;
-  *tls_size = 0;
-}
-#endif  // SANITIZER_GO
-
 enum MutexState {
   MtxUnlocked = 0,
   MtxLocked = 1,
   MtxSleeping = 2
 };
 
-BlockingMutex::BlockingMutex(LinkerInitialized) {
-  CHECK_EQ(owner_, 0);
-}
-
 BlockingMutex::BlockingMutex() {
   internal_memset(this, 0, sizeof(*this));
 }
 
 void BlockingMutex::Lock() {
+  CHECK_EQ(owner_, 0);
   atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
   if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked)
     return;
@@ -760,6 +760,7 @@ bool LibraryNameIs(const char *full_name, const char *base_name) {
 #if !SANITIZER_ANDROID
 // Call cb for each region mapped by map.
 void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)) {
+  CHECK_NE(map, nullptr);
 #if !SANITIZER_FREEBSD
   typedef ElfW(Phdr) Elf_Phdr;
   typedef ElfW(Ehdr) Elf_Ehdr;
@@ -896,8 +897,29 @@ void GetExtraActivationFlags(char *buf, uptr size) {
 #endif
 
 bool IsDeadlySignal(int signum) {
-  return (signum == SIGSEGV) && common_flags()->handle_segv;
+  return (signum == SIGSEGV || signum == SIGBUS) && common_flags()->handle_segv;
+}
+
+#ifndef SANITIZER_GO
+void *internal_start_thread(void(*func)(void *arg), void *arg) {
+  // Start the thread with signals blocked, otherwise it can steal user signals.
+  __sanitizer_sigset_t set, old;
+  internal_sigfillset(&set);
+  internal_sigprocmask(SIG_SETMASK, &set, &old);
+  void *th;
+  real_pthread_create(&th, 0, (void*(*)(void *arg))func, arg);
+  internal_sigprocmask(SIG_SETMASK, &old, 0);
+  return th;
+}
+
+void internal_join_thread(void *th) {
+  real_pthread_join(th, 0);
 }
+#else
+void *internal_start_thread(void (*func)(void *), void *arg) { return 0; }
+
+void internal_join_thread(void *th) {}
+#endif
 
 }  // namespace __sanitizer
 
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc
index 4e09081e7f54..df42c3604ae9 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_linux_libcdep.cc
@@ -58,8 +58,10 @@ real_pthread_attr_getstack(void *attr, void **addr, size_t *size);
 }  // extern "C"
 
 static int my_pthread_attr_getstack(void *attr, void **addr, size_t *size) {
-  if (real_pthread_attr_getstack)
+#if !SANITIZER_GO
+  if (&real_pthread_attr_getstack)
     return real_pthread_attr_getstack((pthread_attr_t *)attr, addr, size);
+#endif
   return pthread_attr_getstack((pthread_attr_t *)attr, addr, size);
 }
 
@@ -67,8 +69,10 @@ SANITIZER_WEAK_ATTRIBUTE int
 real_sigaction(int signum, const void *act, void *oldact);
 
 int internal_sigaction(int signum, const void *act, void *oldact) {
-  if (real_sigaction)
+#if !SANITIZER_GO
+  if (&real_sigaction)
     return real_sigaction(signum, act, oldact);
+#endif
   return sigaction(signum, (const struct sigaction *)act,
                    (struct sigaction *)oldact);
 }
@@ -120,6 +124,7 @@ void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
   *stack_bottom = (uptr)stackaddr;
 }
 
+#if !SANITIZER_GO
 bool SetEnv(const char *name, const char *value) {
   void *f = dlsym(RTLD_NEXT, "setenv");
   if (f == 0)
@@ -130,6 +135,7 @@ bool SetEnv(const char *name, const char *value) {
   internal_memcpy(&setenv_f, &f, sizeof(f));
   return setenv_f(name, value, 1) == 0;
 }
+#endif
 
 bool SanitizerSetThreadName(const char *name) {
 #ifdef PR_SET_NAME
@@ -163,7 +169,7 @@ static uptr g_tls_size;
 #endif
 
 void InitTlsSize() {
-#if !SANITIZER_FREEBSD && !SANITIZER_ANDROID
+#if !SANITIZER_FREEBSD && !SANITIZER_ANDROID && !SANITIZER_GO
   typedef void (*get_tls_func)(size_t*, size_t*) DL_INTERNAL_FUNCTION;
   get_tls_func get_tls;
   void *get_tls_static_info_ptr = dlsym(RTLD_NEXT, "_dl_get_tls_static_info");
@@ -208,6 +214,8 @@ uptr ThreadDescriptorSize() {
         val = FIRST_32_SECOND_64(1168, 1776);
       else if (minor <= 12)
         val = FIRST_32_SECOND_64(1168, 2288);
+      else if (minor == 13)
+        val = FIRST_32_SECOND_64(1168, 2304);
       else
         val = FIRST_32_SECOND_64(1216, 2304);
     }
@@ -259,6 +267,7 @@ uptr ThreadSelf() {
 }
 #endif  // SANITIZER_FREEBSD
 
+#if !SANITIZER_GO
 static void GetTls(uptr *addr, uptr *size) {
 #if SANITIZER_LINUX
 # if defined(__x86_64__) || defined(__i386__)
@@ -287,6 +296,7 @@ static void GetTls(uptr *addr, uptr *size) {
 # error "Unknown OS"
 #endif
 }
+#endif
 
 uptr GetTlsSize() {
 #if SANITIZER_FREEBSD
@@ -300,6 +310,10 @@ uptr GetTlsSize() {
 
 void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
                           uptr *tls_addr, uptr *tls_size) {
+#if SANITIZER_GO
+  // Stub implementation for Go.
+  *stk_addr = *stk_size = *tls_addr = *tls_size = 0;
+#else
   GetTls(tls_addr, tls_size);
 
   uptr stack_top, stack_bottom;
@@ -316,6 +330,7 @@ void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
       *tls_addr = *stk_addr + *stk_size;
     }
   }
+#endif
 }
 
 void AdjustStackSize(void *attr_) {
@@ -420,6 +435,45 @@ void PrepareForSandboxing(__sanitizer_sandbox_arguments *args) {
 #endif
 }
 
+// getrusage does not give us the current RSS, only the max RSS.
+// Still, this is better than nothing if /proc/self/statm is not available
+// for some reason, e.g. due to a sandbox.
+static uptr GetRSSFromGetrusage() {
+  struct rusage usage;
+  if (getrusage(RUSAGE_SELF, &usage))  // Failed, probably due to a sandbox.
+    return 0;
+  return usage.ru_maxrss << 10;  // ru_maxrss is in Kb.
+}
+
+uptr GetRSS() {
+  if (!common_flags()->can_use_proc_maps_statm)
+    return GetRSSFromGetrusage();
+  uptr fd = OpenFile("/proc/self/statm", false);
+  if ((sptr)fd < 0)
+    return GetRSSFromGetrusage();
+  char buf[64];
+  uptr len = internal_read(fd, buf, sizeof(buf) - 1);
+  internal_close(fd);
+  if ((sptr)len <= 0)
+    return 0;
+  buf[len] = 0;
+  // The format of the file is:
+  // 1084 89 69 11 0 79 0
+  // We need the second number which is RSS in pages.
+  char *pos = buf;
+  // Skip the first number.
+  while (*pos >= '0' && *pos <= '9')
+    pos++;
+  // Skip whitespaces.
+  while (!(*pos >= '0' && *pos <= '9') && *pos != 0)
+    pos++;
+  // Read the number.
+  uptr rss = 0;
+  while (*pos >= '0' && *pos <= '9')
+    rss = rss * 10 + *pos++ - '0';
+  return rss * GetPageSizeCached();
+}
+
 }  // namespace __sanitizer
 
 #endif  // SANITIZER_FREEBSD || SANITIZER_LINUX
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_list.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_list.h
index a47bc7d45e3e..6dd9c8f7bca1 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_list.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_list.h
@@ -115,21 +115,25 @@ struct IntrusiveList {
     }
   }
 
-  class Iterator {
+  template<class ListTy, class ItemTy>
+  class IteratorBase {
    public:
-    explicit Iterator(IntrusiveList<Item> *list)
+    explicit IteratorBase(ListTy *list)
         : list_(list), current_(list->first_) { }
-    Item *next() {
-      Item *ret = current_;
+    ItemTy *next() {
+      ItemTy *ret = current_;
       if (current_) current_ = current_->next;
       return ret;
     }
     bool hasNext() const { return current_ != 0; }
    private:
-    IntrusiveList<Item> *list_;
-    Item *current_;
+    ListTy *list_;
+    ItemTy *current_;
   };
 
+  typedef IteratorBase<IntrusiveList<Item>, Item> Iterator;
+  typedef IteratorBase<const IntrusiveList<Item>, const Item> ConstIterator;
+
 // private, don't use directly.
   uptr size_;
   Item *first_;
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
index 98c5b94112cf..39a5c7e8d24f 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
@@ -109,6 +109,10 @@ uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
   return readlink(path, buf, bufsize);
 }
 
+uptr internal_unlink(const char *path) {
+  return unlink(path);
+}
+
 uptr internal_sched_yield() {
   return sched_yield();
 }
@@ -213,10 +217,6 @@ uptr GetPageSize() {
   return sysconf(_SC_PAGESIZE);
 }
 
-BlockingMutex::BlockingMutex(LinkerInitialized) {
-  // We assume that OS_SPINLOCK_INIT is zero
-}
-
 BlockingMutex::BlockingMutex() {
   internal_memset(this, 0, sizeof(*this));
 }
@@ -298,7 +298,11 @@ MacosVersion GetMacosVersionInternal() {
         case '2': return MACOS_VERSION_MOUNTAIN_LION;
         case '3': return MACOS_VERSION_MAVERICKS;
         case '4': return MACOS_VERSION_YOSEMITE;
-        default: return MACOS_VERSION_UNKNOWN;
+        default:
+          if (IsDigit(version[1]))
+            return MACOS_VERSION_UNKNOWN_NEWER;
+          else
+            return MACOS_VERSION_UNKNOWN;
       }
     }
     default: return MACOS_VERSION_UNKNOWN;
@@ -321,6 +325,9 @@ uptr GetRSS() {
   return 0;
 }
 
+void *internal_start_thread(void (*func)(void *arg), void *arg) { return 0; }
+void internal_join_thread(void *th) { }
+
 }  // namespace __sanitizer
 
 #endif  // SANITIZER_MAC
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_mac.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_mac.h
index 3ed0ed3b00c2..9eed905187ec 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_mac.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_mac.h
@@ -27,6 +27,7 @@ enum MacosVersion {
   MACOS_VERSION_MOUNTAIN_LION,
   MACOS_VERSION_MAVERICKS,
   MACOS_VERSION_YOSEMITE,
+  MACOS_VERSION_UNKNOWN_NEWER
 };
 
 MacosVersion GetMacosVersion();
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_mutex.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_mutex.h
index c7589f76ed3b..d06fc45ff931 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_mutex.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_mutex.h
@@ -73,7 +73,13 @@ class SpinMutex : public StaticSpinMutex {
 
 class BlockingMutex {
  public:
+#if SANITIZER_WINDOWS
+  // Windows does not currently support LinkerInitialized
   explicit BlockingMutex(LinkerInitialized);
+#else
+  explicit constexpr BlockingMutex(LinkerInitialized)
+      : opaque_storage_ {0, }, owner_(0) {}
+#endif
   BlockingMutex();
   void Lock();
   void Unlock();
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
index 7ca88fa972f3..54a1cfd8582b 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h
@@ -57,7 +57,7 @@
 #define SANITIZER_INTERCEPT_TEXTDOMAIN SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_STRCASECMP SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_MEMCHR 1
-#define SANITIZER_INTERCEPT_MEMRCHR SI_LINUX
+#define SANITIZER_INTERCEPT_MEMRCHR SI_FREEBSD || SI_LINUX
 
 #define SANITIZER_INTERCEPT_READ   SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_PREAD  SI_NOT_WINDOWS
@@ -70,7 +70,7 @@
 #define SANITIZER_INTERCEPT_READV SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_WRITEV SI_NOT_WINDOWS
 
-#define SANITIZER_INTERCEPT_PREADV SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_PREADV SI_FREEBSD || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_PWRITEV SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_PREADV64 SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_PWRITEV64 SI_LINUX_NOT_ANDROID
@@ -85,6 +85,7 @@
 
 #ifndef SANITIZER_INTERCEPT_PRINTF
 # define SANITIZER_INTERCEPT_PRINTF SI_NOT_WINDOWS
+# define SANITIZER_INTERCEPT_PRINTF_L SI_FREEBSD
 # define SANITIZER_INTERCEPT_ISOC99_PRINTF SI_LINUX_NOT_ANDROID
 #endif
 
@@ -93,12 +94,13 @@
 
 #define SANITIZER_INTERCEPT_GETPWNAM_AND_FRIENDS SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_GETPWNAM_R_AND_FRIENDS \
-  SI_MAC || SI_LINUX_NOT_ANDROID
-#define SANITIZER_INTERCEPT_GETPWENT SI_MAC || SI_LINUX_NOT_ANDROID
+  SI_FREEBSD || SI_MAC || SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_GETPWENT \
+  SI_FREEBSD || SI_MAC || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_FGETPWENT SI_LINUX_NOT_ANDROID
-#define SANITIZER_INTERCEPT_GETPWENT_R SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_GETPWENT_R SI_FREEBSD || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_SETPWENT SI_MAC || SI_LINUX_NOT_ANDROID
-#define SANITIZER_INTERCEPT_CLOCK_GETTIME SI_LINUX
+#define SANITIZER_INTERCEPT_CLOCK_GETTIME SI_FREEBSD || SI_LINUX
 #define SANITIZER_INTERCEPT_GETITIMER SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_TIME SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_GLOB SI_LINUX_NOT_ANDROID
@@ -109,10 +111,10 @@
 #define SANITIZER_INTERCEPT_GETNAMEINFO SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_GETSOCKNAME SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_GETHOSTBYNAME SI_NOT_WINDOWS
-#define SANITIZER_INTERCEPT_GETHOSTBYNAME_R SI_LINUX
-#define SANITIZER_INTERCEPT_GETHOSTBYNAME2_R SI_LINUX_NOT_ANDROID
-#define SANITIZER_INTERCEPT_GETHOSTBYADDR_R SI_LINUX_NOT_ANDROID
-#define SANITIZER_INTERCEPT_GETHOSTENT_R SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_GETHOSTBYNAME_R SI_FREEBSD || SI_LINUX
+#define SANITIZER_INTERCEPT_GETHOSTBYNAME2_R SI_FREEBSD || SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_GETHOSTBYADDR_R SI_FREEBSD || SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_GETHOSTENT_R SI_FREEBSD || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_GETSOCKOPT SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_ACCEPT SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_ACCEPT4 SI_LINUX_NOT_ANDROID
@@ -133,12 +135,15 @@
 #define SANITIZER_INTERCEPT_MBSTOWCS SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_MBSNRTOWCS SI_MAC || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_WCSTOMBS SI_NOT_WINDOWS
-#define SANITIZER_INTERCEPT_WCSNRTOMBS SI_MAC || SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_WCSNRTOMBS \
+  SI_FREEBSD || SI_MAC || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_TCGETATTR SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_REALPATH SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_CANONICALIZE_FILE_NAME SI_LINUX_NOT_ANDROID
-#define SANITIZER_INTERCEPT_CONFSTR SI_MAC || SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_CONFSTR \
+  SI_FREEBSD || SI_MAC || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_SCHED_GETAFFINITY SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_SCHED_GETPARAM SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_STRERROR SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_STRERROR_R SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_XPG_STRERROR_R SI_LINUX_NOT_ANDROID
@@ -147,7 +152,8 @@
 #define SANITIZER_INTERCEPT_GETGROUPS SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_POLL SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_PPOLL SI_LINUX_NOT_ANDROID
-#define SANITIZER_INTERCEPT_WORDEXP (SI_MAC && !SI_IOS) || SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_WORDEXP \
+  SI_FREEBSD || (SI_MAC && !SI_IOS) || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_SIGWAIT SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_SIGWAITINFO SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_SIGTIMEDWAIT SI_LINUX_NOT_ANDROID
@@ -158,21 +164,22 @@
 #define SANITIZER_INTERCEPT_BACKTRACE SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_GETMNTENT SI_LINUX
 #define SANITIZER_INTERCEPT_GETMNTENT_R SI_LINUX_NOT_ANDROID
-#define SANITIZER_INTERCEPT_STATFS SI_MAC || SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_STATFS SI_FREEBSD || SI_MAC || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_STATFS64 \
   (SI_MAC && !SI_IOS) || SI_LINUX_NOT_ANDROID
-#define SANITIZER_INTERCEPT_STATVFS SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_STATVFS SI_FREEBSD || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_STATVFS64 SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_INITGROUPS SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_ETHER_NTOA_ATON SI_NOT_WINDOWS
-#define SANITIZER_INTERCEPT_ETHER_HOST SI_MAC || SI_LINUX_NOT_ANDROID
-#define SANITIZER_INTERCEPT_ETHER_R SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_ETHER_HOST \
+  SI_FREEBSD || SI_MAC || SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_ETHER_R SI_FREEBSD || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_SHMCTL \
   ((SI_FREEBSD || SI_LINUX_NOT_ANDROID) && SANITIZER_WORDSIZE == 64)
 #define SANITIZER_INTERCEPT_RANDOM_R SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_PTHREAD_ATTR_GET SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_PTHREAD_ATTR_GETINHERITSCHED \
-  SI_MAC || SI_LINUX_NOT_ANDROID
+  SI_FREEBSD || SI_MAC || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_PTHREAD_ATTR_GETAFFINITY_NP SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_PTHREAD_MUTEXATTR_GETPSHARED SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_PTHREAD_MUTEXATTR_GETTYPE SI_NOT_WINDOWS
@@ -193,7 +200,7 @@
 #define SANITIZER_INTERCEPT_SINCOS SI_LINUX
 #define SANITIZER_INTERCEPT_REMQUO SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_LGAMMA SI_NOT_WINDOWS
-#define SANITIZER_INTERCEPT_LGAMMA_R SI_LINUX
+#define SANITIZER_INTERCEPT_LGAMMA_R SI_FREEBSD || SI_LINUX
 #define SANITIZER_INTERCEPT_LGAMMAL_R SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_DRAND48_R SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_RAND_R SI_MAC || SI_LINUX_NOT_ANDROID
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cc
index 808e92cb265a..5598ba32bd8f 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.cc
@@ -1060,7 +1060,13 @@ CHECK_SIZE_AND_OFFSET(ipc_perm, uid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, gid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, cuid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, cgid);
+#ifndef __GLIBC_PREREQ
+#define __GLIBC_PREREQ(x, y) 0
+#endif
+#if !defined(__aarch64__) || !SANITIZER_LINUX || __GLIBC_PREREQ (2, 21)
+/* On aarch64 glibc 2.20 and earlier provided incorrect mode field.  */
 CHECK_SIZE_AND_OFFSET(ipc_perm, mode);
+#endif
 
 CHECK_TYPE_SIZE(shmid_ds);
 CHECK_SIZE_AND_OFFSET(shmid_ds, shm_perm);
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
index 80a3ddb36670..d375e01a20e4 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
@@ -18,6 +18,15 @@
 #include "sanitizer_internal_defs.h"
 #include "sanitizer_platform.h"
 
+#if SANITIZER_FREEBSD
+// FreeBSD's dlopen() returns a pointer to an Obj_Entry structure that
+// incroporates the map structure.
+# define GET_LINK_MAP_BY_DLOPEN_HANDLE(handle) \
+    ((link_map*)((handle) == nullptr ? nullptr : ((char*)(handle) + 544)))
+#else
+# define GET_LINK_MAP_BY_DLOPEN_HANDLE(handle) ((link_map*)(handle))
+#endif  // !SANITIZER_FREEBSD
+
 namespace __sanitizer {
   extern unsigned struct_utsname_sz;
   extern unsigned struct_stat_sz;
@@ -169,7 +178,7 @@ namespace __sanitizer {
     unsigned __seq;
     u64 __unused1;
     u64 __unused2;
-#elif defined(__mips__)
+#elif defined(__mips__) || defined(__aarch64__)
     unsigned int mode;
     unsigned short __seq;
     unsigned short __pad1;
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc
index 3b2c47bff22b..5bc41c2580fb 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc
@@ -85,16 +85,15 @@ static uptr GetKernelAreaSize() {
 
 uptr GetMaxVirtualAddress() {
 #if SANITIZER_WORDSIZE == 64
-# if defined(__powerpc64__)
+# if defined(__powerpc64__) || defined(__aarch64__)
   // On PowerPC64 we have two different address space layouts: 44- and 46-bit.
   // We somehow need to figure out which one we are using now and choose
   // one of 0x00000fffffffffffUL and 0x00003fffffffffffUL.
   // Note that with 'ulimit -s unlimited' the stack is moved away from the top
   // of the address space, so simply checking the stack address is not enough.
   // This should (does) work for both PowerPC64 Endian modes.
+  // Similarly, aarch64 has multiple address space layouts: 39, 42 and 47-bit.
   return (1ULL << (MostSignificantSetBitIndex(GET_CURRENT_FRAME()) + 1)) - 1;
-# elif defined(__aarch64__)
-  return (1ULL << 39) - 1;
 # elif defined(__mips64)
   return (1ULL << 40) - 1;  // 0x000000ffffffffffUL;
 # else
@@ -245,7 +244,8 @@ bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
   while (proc_maps.Next(&start, &end,
                         /*offset*/0, /*filename*/0, /*filename_size*/0,
                         /*protection*/0)) {
-    if (!IntervalsAreSeparate(start, end, range_start, range_end))
+    CHECK_NE(0, end);
+    if (!IntervalsAreSeparate(start, end - 1, range_start, range_end))
       return false;
   }
   return true;
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cc
index ed1e3729a00e..11828e6cdf51 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cc
@@ -44,6 +44,18 @@ void FlushUnneededShadowMemory(uptr addr, uptr size) {
   madvise((void*)addr, size, MADV_DONTNEED);
 }
 
+void NoHugePagesInRegion(uptr addr, uptr size) {
+#ifdef MADV_NOHUGEPAGE  // May not be defined on old systems.
+  madvise((void *)addr, size, MADV_NOHUGEPAGE);
+#endif  // MADV_NOHUGEPAGE
+}
+
+void DontDumpShadowMemory(uptr addr, uptr length) {
+#ifdef MADV_DONTDUMP
+  madvise((void *)addr, length, MADV_DONTDUMP);
+#endif
+}
+
 static rlim_t getlim(int res) {
   rlimit rlim;
   CHECK_EQ(0, getrlimit(res, &rlim));
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_quarantine.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_quarantine.h
index db4eb74505f9..404d3753f7e9 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_quarantine.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_quarantine.h
@@ -49,11 +49,14 @@ class Quarantine {
   }
 
   void Init(uptr size, uptr cache_size) {
-    max_size_ = size;
-    min_size_ = size / 10 * 9;  // 90% of max size.
+    atomic_store(&max_size_, size, memory_order_release);
+    atomic_store(&min_size_, size / 10 * 9,
+                 memory_order_release); // 90% of max size.
     max_cache_size_ = cache_size;
   }
 
+  uptr GetSize() const { return atomic_load(&max_size_, memory_order_acquire); }
+
   void Put(Cache *c, Callback cb, Node *ptr, uptr size) {
     c->Enqueue(cb, ptr, size);
     if (c->Size() > max_cache_size_)
@@ -65,15 +68,15 @@ class Quarantine {
       SpinMutexLock l(&cache_mutex_);
       cache_.Transfer(c);
     }
-    if (cache_.Size() > max_size_ && recycle_mutex_.TryLock())
+    if (cache_.Size() > GetSize() && recycle_mutex_.TryLock())
       Recycle(cb);
   }
 
  private:
   // Read-only data.
   char pad0_[kCacheLineSize];
-  uptr max_size_;
-  uptr min_size_;
+  atomic_uintptr_t max_size_;
+  atomic_uintptr_t min_size_;
   uptr max_cache_size_;
   char pad1_[kCacheLineSize];
   SpinMutex cache_mutex_;
@@ -83,9 +86,10 @@ class Quarantine {
 
   void NOINLINE Recycle(Callback cb) {
     Cache tmp;
+    uptr min_size = atomic_load(&min_size_, memory_order_acquire);
     {
       SpinMutexLock l(&cache_mutex_);
-      while (cache_.Size() > min_size_) {
+      while (cache_.Size() > min_size) {
         QuarantineBatch *b = cache_.DequeueBatch();
         tmp.EnqueueBatch(b);
       }
@@ -130,6 +134,7 @@ class QuarantineCache {
       size += sizeof(QuarantineBatch);  // Count the batch in Quarantine size.
     }
     QuarantineBatch *b = list_.back();
+    CHECK(b);
     b->batch[b->count++] = ptr;
     b->size += size;
     SizeAdd(size);
@@ -168,6 +173,7 @@ class QuarantineCache {
 
   NOINLINE QuarantineBatch* AllocBatch(Callback cb) {
     QuarantineBatch *b = (QuarantineBatch *)cb.Allocate(sizeof(*b));
+    CHECK(b);
     b->count = 0;
     b->size = 0;
     list_.push_back(b);
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stackdepot.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stackdepot.cc
index f10f1f973fd0..59b53f4dcd84 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stackdepot.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stackdepot.cc
@@ -22,7 +22,8 @@ struct StackDepotNode {
   StackDepotNode *link;
   u32 id;
   atomic_uint32_t hash_and_use_count; // hash_bits : 12; use_count : 20;
-  uptr size;
+  u32 size;
+  u32 tag;
   uptr stack[1];  // [size]
 
   static const u32 kTabSizeLog = 20;
@@ -37,7 +38,8 @@ struct StackDepotNode {
   bool eq(u32 hash, const args_type &args) const {
     u32 hash_bits =
         atomic_load(&hash_and_use_count, memory_order_relaxed) & kHashMask;
-    if ((hash & kHashMask) != hash_bits || args.size != size) return false;
+    if ((hash & kHashMask) != hash_bits || args.size != size || args.tag != tag)
+      return false;
     uptr i = 0;
     for (; i < size; i++) {
       if (stack[i] != args.trace[i]) return false;
@@ -72,10 +74,11 @@ struct StackDepotNode {
   void store(const args_type &args, u32 hash) {
     atomic_store(&hash_and_use_count, hash & kHashMask, memory_order_relaxed);
     size = args.size;
+    tag = args.tag;
     internal_memcpy(stack, args.trace, size * sizeof(uptr));
   }
   args_type load() const {
-    return args_type(&stack[0], size);
+    return args_type(&stack[0], size, tag);
   }
   StackDepotHandle get_handle() { return StackDepotHandle(this); }
 
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.cc
index cf061fb8c73f..2deadb6e3560 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.cc
@@ -17,21 +17,6 @@
 
 namespace __sanitizer {
 
-uptr StackTrace::GetPreviousInstructionPc(uptr pc) {
-#if defined(__arm__)
-  // Cancel Thumb bit.
-  pc = pc & (~1);
-#endif
-#if defined(__powerpc__) || defined(__powerpc64__)
-  // PCs are always 4 byte aligned.
-  return pc - 4;
-#elif defined(__sparc__) || defined(__mips__)
-  return pc - 8;
-#else
-  return pc - 1;
-#endif
-}
-
 uptr StackTrace::GetNextInstructionPc(uptr pc) {
 #if defined(__mips__)
   return pc + 8;
@@ -83,7 +68,7 @@ static inline uhwptr *GetCanonicFrame(uptr bp,
 }
 
 void BufferedStackTrace::FastUnwindStack(uptr pc, uptr bp, uptr stack_top,
-                                         uptr stack_bottom, uptr max_depth) {
+                                         uptr stack_bottom, u32 max_depth) {
   CHECK_GE(max_depth, 2);
   trace_buffer[0] = pc;
   size = 1;
@@ -120,7 +105,7 @@ void BufferedStackTrace::PopStackFrames(uptr count) {
 uptr BufferedStackTrace::LocatePcInTrace(uptr pc) {
   // Use threshold to find PC in stack trace, as PC we want to unwind from may
   // slightly differ from return address in the actual unwinded stack trace.
-  const int kPcThreshold = 288;
+  const int kPcThreshold = 304;
   for (uptr i = 0; i < size; ++i) {
     if (MatchPc(pc, trace[i], kPcThreshold))
       return i;
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.h
index e755c052cb77..6c3a1511f337 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.h
@@ -17,7 +17,7 @@
 
 namespace __sanitizer {
 
-static const uptr kStackTraceMax = 256;
+static const u32 kStackTraceMax = 256;
 
 #if SANITIZER_LINUX && (defined(__aarch64__) || defined(__powerpc__) || \
                         defined(__powerpc64__) || defined(__sparc__) || \
@@ -40,10 +40,18 @@ static const uptr kStackTraceMax = 256;
 
 struct StackTrace {
   const uptr *trace;
-  uptr size;
+  u32 size;
+  u32 tag;
 
-  StackTrace() : trace(nullptr), size(0) {}
-  StackTrace(const uptr *trace, uptr size) : trace(trace), size(size) {}
+  static const int TAG_UNKNOWN = 0;
+  static const int TAG_ALLOC = 1;
+  static const int TAG_DEALLOC = 2;
+  static const int TAG_CUSTOM = 100; // Tool specific tags start here.
+
+  StackTrace() : trace(nullptr), size(0), tag(0) {}
+  StackTrace(const uptr *trace, u32 size) : trace(trace), size(size), tag(0) {}
+  StackTrace(const uptr *trace, u32 size, u32 tag)
+      : trace(trace), size(size), tag(tag) {}
 
   // Prints a symbolized stacktrace, followed by an empty line.
   void Print() const;
@@ -57,12 +65,29 @@ struct StackTrace {
   }
 
   static uptr GetCurrentPc();
-  static uptr GetPreviousInstructionPc(uptr pc);
+  static inline uptr GetPreviousInstructionPc(uptr pc);
   static uptr GetNextInstructionPc(uptr pc);
   typedef bool (*SymbolizeCallback)(const void *pc, char *out_buffer,
                                     int out_size);
 };
 
+// Performance-critical, must be in the header.
+ALWAYS_INLINE
+uptr StackTrace::GetPreviousInstructionPc(uptr pc) {
+#if defined(__arm__)
+  // Cancel Thumb bit.
+  pc = pc & (~1);
+#endif
+#if defined(__powerpc__) || defined(__powerpc64__)
+  // PCs are always 4 byte aligned.
+  return pc - 4;
+#elif defined(__sparc__) || defined(__mips__)
+  return pc - 8;
+#else
+  return pc - 1;
+#endif
+}
+
 // StackTrace that owns the buffer used to store the addresses.
 struct BufferedStackTrace : public StackTrace {
   uptr trace_buffer[kStackTraceMax];
@@ -71,15 +96,15 @@ struct BufferedStackTrace : public StackTrace {
   BufferedStackTrace() : StackTrace(trace_buffer, 0), top_frame_bp(0) {}
 
   void Init(const uptr *pcs, uptr cnt, uptr extra_top_pc = 0);
-  void Unwind(uptr max_depth, uptr pc, uptr bp, void *context, uptr stack_top,
+  void Unwind(u32 max_depth, uptr pc, uptr bp, void *context, uptr stack_top,
               uptr stack_bottom, bool request_fast_unwind);
 
  private:
   void FastUnwindStack(uptr pc, uptr bp, uptr stack_top, uptr stack_bottom,
-                       uptr max_depth);
-  void SlowUnwindStack(uptr pc, uptr max_depth);
+                       u32 max_depth);
+  void SlowUnwindStack(uptr pc, u32 max_depth);
   void SlowUnwindStackWithContext(uptr pc, void *context,
-                                  uptr max_depth);
+                                  u32 max_depth);
   void PopStackFrames(uptr count);
   uptr LocatePcInTrace(uptr pc);
 
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace_libcdep.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace_libcdep.cc
index 0d90980e6a68..0f98c7d5af4c 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace_libcdep.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_stacktrace_libcdep.cc
@@ -44,7 +44,7 @@ void StackTrace::Print() const {
   Printf("\n");
 }
 
-void BufferedStackTrace::Unwind(uptr max_depth, uptr pc, uptr bp, void *context,
+void BufferedStackTrace::Unwind(u32 max_depth, uptr pc, uptr bp, void *context,
                                 uptr stack_top, uptr stack_bottom,
                                 bool request_fast_unwind) {
   top_frame_bp = (max_depth > 0) ? bp : 0;
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_libbacktrace.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_libbacktrace.cc
index bb8ba6b81674..9317a78eef13 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_libbacktrace.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_libbacktrace.cc
@@ -173,9 +173,9 @@ SymbolizedStack *LibbacktraceSymbolizer::SymbolizeCode(uptr addr,
   return data.first;
 }
 
-bool LibbacktraceSymbolizer::SymbolizeData(DataInfo *info) {
-  backtrace_syminfo((backtrace_state *)state_, info->address,
-                    SymbolizeDataCallback, ErrorCallback, info);
+bool LibbacktraceSymbolizer::SymbolizeData(uptr addr, DataInfo *info) {
+  backtrace_syminfo((backtrace_state *)state_, addr, SymbolizeDataCallback,
+                    ErrorCallback, info);
   return true;
 }
 
@@ -192,7 +192,7 @@ SymbolizedStack *LibbacktraceSymbolizer::SymbolizeCode(uptr addr,
   return nullptr;
 }
 
-bool LibbacktraceSymbolizer::SymbolizeData(DataInfo *info) {
+bool LibbacktraceSymbolizer::SymbolizeData(uptr addr, DataInfo *info) {
   return false;
 }
 
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_libbacktrace.h b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_libbacktrace.h
index a335cb23788c..1ff005042a11 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_libbacktrace.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_libbacktrace.h
@@ -35,7 +35,7 @@ class LibbacktraceSymbolizer {
   SymbolizedStack *SymbolizeCode(uptr addr, const char *module_name,
                                  uptr module_offset);
 
-  bool SymbolizeData(DataInfo *info);
+  bool SymbolizeData(uptr addr, DataInfo *info);
 
   // May return NULL if demangling failed.
   static char *Demangle(const char *name, bool always_alloc = false);
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
index d46c249e6cab..69ac18e8426f 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_posix_libcdep.cc
@@ -596,7 +596,7 @@ class POSIXSymbolizer : public Symbolizer {
     // First, try to use libbacktrace symbolizer (if it's available).
     if (libbacktrace_symbolizer_ != 0) {
       mu_.CheckLocked();
-      if (libbacktrace_symbolizer_->SymbolizeData(info))
+      if (libbacktrace_symbolizer_->SymbolizeData(addr, info))
         return true;
     }
     const char *str = SendCommand(true, module_name, module_offset);
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_unwind_posix_libcdep.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_unwind_posix_libcdep.cc
index a98e61771c02..7ab2efbd75bd 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_unwind_posix_libcdep.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_unwind_posix_libcdep.cc
@@ -96,7 +96,7 @@ uptr Unwind_GetIP(struct _Unwind_Context *ctx) {
 
 struct UnwindTraceArg {
   BufferedStackTrace *stack;
-  uptr max_depth;
+  u32 max_depth;
 };
 
 _Unwind_Reason_Code Unwind_Trace(struct _Unwind_Context *ctx, void *param) {
@@ -108,7 +108,7 @@ _Unwind_Reason_Code Unwind_Trace(struct _Unwind_Context *ctx, void *param) {
   return UNWIND_CONTINUE;
 }
 
-void BufferedStackTrace::SlowUnwindStack(uptr pc, uptr max_depth) {
+void BufferedStackTrace::SlowUnwindStack(uptr pc, u32 max_depth) {
   CHECK_GE(max_depth, 2);
   size = 0;
   UnwindTraceArg arg = {this, Min(max_depth + 1, kStackTraceMax)};
@@ -128,7 +128,7 @@ void BufferedStackTrace::SlowUnwindStack(uptr pc, uptr max_depth) {
 }
 
 void BufferedStackTrace::SlowUnwindStackWithContext(uptr pc, void *context,
-                                                    uptr max_depth) {
+                                                    u32 max_depth) {
   CHECK_GE(max_depth, 2);
   if (!unwind_backtrace_signal_arch) {
     SlowUnwindStack(pc, max_depth);
diff --git a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_win.cc b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_win.cc
index 3e9014199651..edd4bd11b369 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/sanitizer_win.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/sanitizer_win.cc
@@ -20,6 +20,7 @@
 #include <windows.h>
 #include <dbghelp.h>
 #include <io.h>
+#include <psapi.h>
 #include <stdlib.h>
 
 #include "sanitizer_common.h"
@@ -122,18 +123,34 @@ void *MmapNoReserveOrDie(uptr size, const char *mem_type) {
 }
 
 void *Mprotect(uptr fixed_addr, uptr size) {
-  return VirtualAlloc((LPVOID)fixed_addr, size,
-                      MEM_RESERVE | MEM_COMMIT, PAGE_NOACCESS);
+  void *res = VirtualAlloc((LPVOID)fixed_addr, size,
+                           MEM_RESERVE | MEM_COMMIT, PAGE_NOACCESS);
+  if (res == 0)
+    Report("WARNING: %s failed to "
+           "mprotect %p (%zd) bytes at %p (error code: %d)\n",
+           SanitizerToolName, size, size, fixed_addr, GetLastError());
+  return res;
 }
 
 void FlushUnneededShadowMemory(uptr addr, uptr size) {
   // This is almost useless on 32-bits.
-  // FIXME: add madvice-analog when we move to 64-bits.
+  // FIXME: add madvise-analog when we move to 64-bits.
+}
+
+void NoHugePagesInRegion(uptr addr, uptr size) {
+  // FIXME: probably similar to FlushUnneededShadowMemory.
+}
+
+void DontDumpShadowMemory(uptr addr, uptr length) {
+  // This is almost useless on 32-bits.
+  // FIXME: add madvise-analog when we move to 64-bits.
 }
 
 bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
-  // FIXME: shall we do anything here on Windows?
-  return true;
+  MEMORY_BASIC_INFORMATION mbi;
+  CHECK(VirtualQuery((void *)range_start, &mbi, sizeof(mbi)));
+  return mbi.Protect == PAGE_NOACCESS &&
+         (uptr)mbi.BaseAddress + mbi.RegionSize >= range_end;
 }
 
 void *MapFileToMemory(const char *file_name, uptr *buff_size) {
@@ -187,8 +204,77 @@ u32 GetUid() {
   UNIMPLEMENTED();
 }
 
+namespace {
+struct ModuleInfo {
+  HMODULE handle;
+  uptr base_address;
+  uptr end_address;
+};
+
+int CompareModulesBase(const void *pl, const void *pr) {
+  const ModuleInfo &l = *(ModuleInfo *)pl, &r = *(ModuleInfo *)pr;
+  if (l.base_address < r.base_address)
+    return -1;
+  return l.base_address > r.base_address;
+}
+}  // namespace
+
 void DumpProcessMap() {
-  UNIMPLEMENTED();
+  Report("Dumping process modules:\n");
+  HANDLE cur_process = GetCurrentProcess();
+
+  // Query the list of modules.  Start by assuming there are no more than 256
+  // modules and retry if that's not sufficient.
+  ModuleInfo *modules;
+  size_t num_modules;
+  {
+    HMODULE *hmodules = 0;
+    uptr modules_buffer_size = sizeof(HMODULE) * 256;
+    DWORD bytes_required;
+    while (!hmodules) {
+      hmodules = (HMODULE *)MmapOrDie(modules_buffer_size, __FUNCTION__);
+      CHECK(EnumProcessModules(cur_process, hmodules, modules_buffer_size,
+                               &bytes_required));
+      if (bytes_required > modules_buffer_size) {
+        // Either there turned out to be more than 256 hmodules, or new hmodules
+        // could have loaded since the last try.  Retry.
+        UnmapOrDie(hmodules, modules_buffer_size);
+        hmodules = 0;
+        modules_buffer_size = bytes_required;
+      }
+    }
+
+    num_modules = bytes_required / sizeof(HMODULE);
+    modules =
+        (ModuleInfo *)MmapOrDie(num_modules * sizeof(ModuleInfo), __FUNCTION__);
+    for (size_t i = 0; i < num_modules; ++i) {
+      modules[i].handle = hmodules[i];
+      MODULEINFO mi;
+      if (!GetModuleInformation(cur_process, hmodules[i], &mi, sizeof(mi)))
+        continue;
+      modules[i].base_address = (uptr)mi.lpBaseOfDll;
+      modules[i].end_address = (uptr)mi.lpBaseOfDll + mi.SizeOfImage;
+    }
+    UnmapOrDie(hmodules, modules_buffer_size);
+  }
+
+  qsort(modules, num_modules, sizeof(ModuleInfo), CompareModulesBase);
+
+  for (size_t i = 0; i < num_modules; ++i) {
+    const ModuleInfo &mi = modules[i];
+    char module_name[MAX_PATH];
+    bool got_module_name = GetModuleFileNameEx(
+        cur_process, mi.handle, module_name, sizeof(module_name));
+    if (mi.end_address != 0) {
+      Printf("\t%p-%p %s\n", mi.base_address, mi.end_address,
+             got_module_name ? module_name : "[no name]");
+    } else if (got_module_name) {
+      Printf("\t??\?-??? %s\n", module_name);
+    } else {
+      Printf("\t???\n");
+    }
+  }
+  UnmapOrDie(modules, num_modules * sizeof(ModuleInfo));
 }
 
 void DisableCoreDumperIfNecessary() {
@@ -238,8 +324,9 @@ u64 NanoTime() {
 }
 
 void Abort() {
-  abort();
-  internal__exit(-1);  // abort is not NORETURN on Windows.
+  if (::IsDebuggerPresent())
+    __debugbreak();
+  internal__exit(3);
 }
 
 uptr GetListOfModules(LoadedModule *modules, uptr max_modules,
@@ -379,6 +466,9 @@ uptr GetRSS() {
   return 0;
 }
 
+void *internal_start_thread(void (*func)(void *arg), void *arg) { return 0; }
+void internal_join_thread(void *th) { }
+
 // ---------------------- BlockingMutex ---------------- {{{1
 const uptr LOCK_UNINITIALIZED = 0;
 const uptr LOCK_READY = (uptr)-1;
@@ -448,7 +538,7 @@ void GetThreadStackAndTls(bool main, uptr *stk_addr, uptr *stk_size,
 }
 
 #if !SANITIZER_GO
-void BufferedStackTrace::SlowUnwindStack(uptr pc, uptr max_depth) {
+void BufferedStackTrace::SlowUnwindStack(uptr pc, u32 max_depth) {
   CHECK_GE(max_depth, 2);
   // FIXME: CaptureStackBackTrace might be too slow for us.
   // FIXME: Compare with StackWalk64.
@@ -464,7 +554,7 @@ void BufferedStackTrace::SlowUnwindStack(uptr pc, uptr max_depth) {
 }
 
 void BufferedStackTrace::SlowUnwindStackWithContext(uptr pc, void *context,
-                                                    uptr max_depth) {
+                                                    u32 max_depth) {
   CONTEXT ctx = *(CONTEXT *)context;
   STACKFRAME64 stack_frame;
   memset(&stack_frame, 0, sizeof(stack_frame));
diff --git a/contrib/compiler-rt/lib/sanitizer_common/scripts/check_lint.sh b/contrib/compiler-rt/lib/sanitizer_common/scripts/check_lint.sh
index 267273d97794..7ed05d73563a 100755
--- a/contrib/compiler-rt/lib/sanitizer_common/scripts/check_lint.sh
+++ b/contrib/compiler-rt/lib/sanitizer_common/scripts/check_lint.sh
@@ -32,7 +32,14 @@ LSAN_LIT_TEST_LINT_FILTER=${LSAN_RTL_LINT_FILTER},-whitespace/line_length
 DFSAN_RTL_LINT_FILTER=${COMMON_LINT_FILTER},-runtime/int,-runtime/printf,-runtime/references,-readability/function
 COMMON_RTL_INC_LINT_FILTER=${COMMON_LINT_FILTER},-runtime/int,-runtime/sizeof,-runtime/printf,-readability/fn_size
 SANITIZER_INCLUDES_LINT_FILTER=${COMMON_LINT_FILTER},-runtime/int
-MKTEMP="mktemp -q /tmp/tmp.XXXXXXXXXX"
+
+MKTEMP_DIR=$(mktemp -qd /tmp/check_lint.XXXXXXXXXX)
+MKTEMP="mktemp -q ${MKTEMP_DIR}/tmp.XXXXXXXXXX"
+cleanup() {
+  rm -rf $MKTEMP_DIR
+}
+trap cleanup EXIT
+
 cd ${LLVM_CHECKOUT}
 
 EXITSTATUS=0
diff --git a/contrib/compiler-rt/lib/sanitizer_common/scripts/sancov.py b/contrib/compiler-rt/lib/sanitizer_common/scripts/sancov.py
index 476953015280..566116eb2334 100755
--- a/contrib/compiler-rt/lib/sanitizer_common/scripts/sancov.py
+++ b/contrib/compiler-rt/lib/sanitizer_common/scripts/sancov.py
@@ -118,7 +118,7 @@ def UnpackOneRawFile(path, map_path):
       if len(pc_list) == 0: continue
       assert path.endswith('.sancov.raw')
       dst_path = module_path + '.' + os.path.basename(path)[:-4]
-      print "writing %d PCs to %s" % (len(pc_list), dst_path)
+      print >> sys.stderr, "%s: writing %d PCs to %s" % (prog_name, len(pc_list), dst_path)
       arr = array.array('I')
       arr.fromlist(sorted(pc_list))
       with open(dst_path, 'ab') as f2:
diff --git a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_allocator_test.cc b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_allocator_test.cc
index f61d58dea7d9..be8fc91aa861 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_allocator_test.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_allocator_test.cc
@@ -14,7 +14,6 @@
 #include "sanitizer_common/sanitizer_allocator.h"
 #include "sanitizer_common/sanitizer_allocator_internal.h"
 #include "sanitizer_common/sanitizer_common.h"
-#include "sanitizer_common/sanitizer_flags.h"
 
 #include "sanitizer_test_utils.h"
 #include "sanitizer_pthread_wrappers.h"
@@ -27,9 +26,9 @@
 #include <set>
 
 // Too slow for debug build
-#if TSAN_DEBUG == 0
+#if !SANITIZER_DEBUG
 
-#if SANITIZER_WORDSIZE == 64
+#if SANITIZER_CAN_USE_ALLOCATOR64
 static const uptr kAllocatorSpace = 0x700000000000ULL;
 static const uptr kAllocatorSize  = 0x010000000000ULL;  // 1T.
 static const u64 kAddressSpaceSize = 1ULL << 47;
@@ -39,6 +38,8 @@ typedef SizeClassAllocator64<
 
 typedef SizeClassAllocator64<
   kAllocatorSpace, kAllocatorSize, 16, CompactSizeClassMap> Allocator64Compact;
+#elif defined(__mips64)
+static const u64 kAddressSpaceSize = 1ULL << 40;
 #else
 static const u64 kAddressSpaceSize = 1ULL << 32;
 #endif
@@ -140,7 +141,7 @@ void TestSizeClassAllocator() {
   delete a;
 }
 
-#if SANITIZER_WORDSIZE == 64
+#if SANITIZER_CAN_USE_ALLOCATOR64
 TEST(SanitizerCommon, SizeClassAllocator64) {
   TestSizeClassAllocator<Allocator64>();
 }
@@ -184,7 +185,7 @@ void SizeClassAllocatorMetadataStress() {
   delete a;
 }
 
-#if SANITIZER_WORDSIZE == 64
+#if SANITIZER_CAN_USE_ALLOCATOR64
 TEST(SanitizerCommon, SizeClassAllocator64MetadataStress) {
   SizeClassAllocatorMetadataStress<Allocator64>();
 }
@@ -192,7 +193,7 @@ TEST(SanitizerCommon, SizeClassAllocator64MetadataStress) {
 TEST(SanitizerCommon, SizeClassAllocator64CompactMetadataStress) {
   SizeClassAllocatorMetadataStress<Allocator64Compact>();
 }
-#endif  // SANITIZER_WORDSIZE == 64
+#endif  // SANITIZER_CAN_USE_ALLOCATOR64
 TEST(SanitizerCommon, SizeClassAllocator32CompactMetadataStress) {
   SizeClassAllocatorMetadataStress<Allocator32Compact>();
 }
@@ -221,7 +222,7 @@ void SizeClassAllocatorGetBlockBeginStress() {
   delete a;
 }
 
-#if SANITIZER_WORDSIZE == 64
+#if SANITIZER_CAN_USE_ALLOCATOR64
 TEST(SanitizerCommon, SizeClassAllocator64GetBlockBegin) {
   SizeClassAllocatorGetBlockBeginStress<Allocator64>();
 }
@@ -231,7 +232,7 @@ TEST(SanitizerCommon, SizeClassAllocator64CompactGetBlockBegin) {
 TEST(SanitizerCommon, SizeClassAllocator32CompactGetBlockBegin) {
   SizeClassAllocatorGetBlockBeginStress<Allocator32Compact>();
 }
-#endif  // SANITIZER_WORDSIZE == 64
+#endif  // SANITIZER_CAN_USE_ALLOCATOR64
 
 struct TestMapUnmapCallback {
   static int map_count, unmap_count;
@@ -241,7 +242,7 @@ struct TestMapUnmapCallback {
 int TestMapUnmapCallback::map_count;
 int TestMapUnmapCallback::unmap_count;
 
-#if SANITIZER_WORDSIZE == 64
+#if SANITIZER_CAN_USE_ALLOCATOR64
 TEST(SanitizerCommon, SizeClassAllocator64MapUnmapCallback) {
   TestMapUnmapCallback::map_count = 0;
   TestMapUnmapCallback::unmap_count = 0;
@@ -297,7 +298,7 @@ TEST(SanitizerCommon, LargeMmapAllocatorMapUnmapCallback) {
   TestMapUnmapCallback::map_count = 0;
   TestMapUnmapCallback::unmap_count = 0;
   LargeMmapAllocator<TestMapUnmapCallback> a;
-  a.Init();
+  a.Init(/* may_return_null */ false);
   AllocatorStats stats;
   stats.Init();
   void *x = a.Allocate(&stats, 1 << 20, 1);
@@ -322,7 +323,7 @@ void FailInAssertionOnOOM() {
   a.TestOnlyUnmap();
 }
 
-#if SANITIZER_WORDSIZE == 64
+#if SANITIZER_CAN_USE_ALLOCATOR64
 TEST(SanitizerCommon, SizeClassAllocator64Overflow) {
   EXPECT_DEATH(FailInAssertionOnOOM<Allocator64>(), "Out of memory");
 }
@@ -331,7 +332,7 @@ TEST(SanitizerCommon, SizeClassAllocator64Overflow) {
 #if !defined(_WIN32)  // FIXME: This currently fails on Windows.
 TEST(SanitizerCommon, LargeMmapAllocator) {
   LargeMmapAllocator<> a;
-  a.Init();
+  a.Init(/* may_return_null */ false);
   AllocatorStats stats;
   stats.Init();
 
@@ -413,25 +414,22 @@ void TestCombinedAllocator() {
       CombinedAllocator<PrimaryAllocator, AllocatorCache, SecondaryAllocator>
       Allocator;
   Allocator *a = new Allocator;
-  a->Init();
+  a->Init(/* may_return_null */ true);
 
   AllocatorCache cache;
   memset(&cache, 0, sizeof(cache));
   a->InitCache(&cache);
 
-  bool allocator_may_return_null = common_flags()->allocator_may_return_null;
-  common_flags()->allocator_may_return_null = true;
   EXPECT_EQ(a->Allocate(&cache, -1, 1), (void*)0);
   EXPECT_EQ(a->Allocate(&cache, -1, 1024), (void*)0);
   EXPECT_EQ(a->Allocate(&cache, (uptr)-1 - 1024, 1), (void*)0);
   EXPECT_EQ(a->Allocate(&cache, (uptr)-1 - 1024, 1024), (void*)0);
   EXPECT_EQ(a->Allocate(&cache, (uptr)-1 - 1023, 1024), (void*)0);
 
-  common_flags()->allocator_may_return_null = false;
+  // Set to false
+  a->SetMayReturnNull(false);
   EXPECT_DEATH(a->Allocate(&cache, -1, 1),
                "allocator is terminating the process");
-  // Restore the original value.
-  common_flags()->allocator_may_return_null = allocator_may_return_null;
 
   const uptr kNumAllocs = 100000;
   const uptr kNumIter = 10;
@@ -465,7 +463,7 @@ void TestCombinedAllocator() {
   a->TestOnlyUnmap();
 }
 
-#if SANITIZER_WORDSIZE == 64
+#if SANITIZER_CAN_USE_ALLOCATOR64
 TEST(SanitizerCommon, CombinedAllocator64) {
   TestCombinedAllocator<Allocator64,
       LargeMmapAllocator<>,
@@ -521,7 +519,7 @@ void TestSizeClassAllocatorLocalCache() {
   delete a;
 }
 
-#if SANITIZER_WORDSIZE == 64
+#if SANITIZER_CAN_USE_ALLOCATOR64
 TEST(SanitizerCommon, SizeClassAllocator64LocalCache) {
   TestSizeClassAllocatorLocalCache<
       SizeClassAllocatorLocalCache<Allocator64> >();
@@ -538,7 +536,7 @@ TEST(SanitizerCommon, SizeClassAllocator32CompactLocalCache) {
       SizeClassAllocatorLocalCache<Allocator32Compact> >();
 }
 
-#if SANITIZER_WORDSIZE == 64
+#if SANITIZER_CAN_USE_ALLOCATOR64
 typedef SizeClassAllocatorLocalCache<Allocator64> AllocatorCache;
 static AllocatorCache static_allocator_cache;
 
@@ -694,7 +692,7 @@ void TestSizeClassAllocatorIteration() {
   delete a;
 }
 
-#if SANITIZER_WORDSIZE == 64
+#if SANITIZER_CAN_USE_ALLOCATOR64
 TEST(SanitizerCommon, SizeClassAllocator64Iteration) {
   TestSizeClassAllocatorIteration<Allocator64>();
 }
@@ -706,7 +704,7 @@ TEST(SanitizerCommon, SizeClassAllocator32Iteration) {
 
 TEST(SanitizerCommon, LargeMmapAllocatorIteration) {
   LargeMmapAllocator<> a;
-  a.Init();
+  a.Init(/* may_return_null */ false);
   AllocatorStats stats;
   stats.Init();
 
@@ -733,7 +731,7 @@ TEST(SanitizerCommon, LargeMmapAllocatorIteration) {
 
 TEST(SanitizerCommon, LargeMmapAllocatorBlockBegin) {
   LargeMmapAllocator<> a;
-  a.Init();
+  a.Init(/* may_return_null */ false);
   AllocatorStats stats;
   stats.Init();
 
@@ -769,7 +767,7 @@ TEST(SanitizerCommon, LargeMmapAllocatorBlockBegin) {
 }
 
 
-#if SANITIZER_WORDSIZE == 64
+#if SANITIZER_CAN_USE_ALLOCATOR64
 // Regression test for out-of-memory condition in PopulateFreeList().
 TEST(SanitizerCommon, SizeClassAllocator64PopulateFreeListOOM) {
   // In a world where regions are small and chunks are huge...
@@ -859,4 +857,4 @@ TEST(SanitizerCommon, ThreadedTwoLevelByteMap) {
   EXPECT_EQ((uptr)TestMapUnmapCallback::unmap_count, m.size1());
 }
 
-#endif  // #if TSAN_DEBUG==0
+#endif  // #if !SANITIZER_DEBUG
diff --git a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_deadlock_detector_test.cc b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_deadlock_detector_test.cc
index 8c8363353507..7835eef76d06 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_deadlock_detector_test.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_deadlock_detector_test.cc
@@ -268,7 +268,7 @@ void RunMultipleEpochsTest() {
   }
   EXPECT_EQ(d.testOnlyGetEpoch(), 4 * d.size());
 
-#if TSAN_DEBUG == 0
+#if !SANITIZER_DEBUG
   // EXPECT_DEATH clones a thread with 4K stack,
   // which is overflown by tsan memory accesses functions in debug mode.
 
diff --git a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_flags_test.cc b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_flags_test.cc
index 1055f5d24d6b..3e5d8381ed3a 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_flags_test.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_flags_test.cc
@@ -12,7 +12,9 @@
 //===----------------------------------------------------------------------===//
 #include "sanitizer_common/sanitizer_common.h"
 #include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_flag_parser.h"
 #include "sanitizer_common/sanitizer_libc.h"
+#include "sanitizer_common/sanitizer_allocator_internal.h"
 #include "gtest/gtest.h"
 
 #include <string.h>
@@ -20,58 +22,79 @@
 namespace __sanitizer {
 
 static const char kFlagName[] = "flag_name";
+static const char kFlagDesc[] = "flag description";
 
 template <typename T>
 static void TestFlag(T start_value, const char *env, T final_value) {
   T flag = start_value;
-  ParseFlag(env, &flag, kFlagName, "flag description");
+
+  FlagParser parser;
+  RegisterFlag(&parser, kFlagName, kFlagDesc, &flag);
+
+  parser.ParseString(env);
+
   EXPECT_EQ(final_value, flag);
 }
 
-static void TestStrFlag(const char *start_value, const char *env,
-                        const char *final_value) {
+template <>
+void TestFlag(const char *start_value, const char *env,
+                     const char *final_value) {
   const char *flag = start_value;
-  ParseFlag(env, &flag, kFlagName, "flag description");
+
+  FlagParser parser;
+  RegisterFlag(&parser, kFlagName, kFlagDesc, &flag);
+
+  parser.ParseString(env);
+
   EXPECT_EQ(0, internal_strcmp(final_value, flag));
 }
 
 TEST(SanitizerCommon, BooleanFlags) {
-  TestFlag(true, "--flag_name", true);
-  TestFlag(false, "flag_name", false);
-  TestFlag(false, "--flag_name=1", true);
-  TestFlag(true, "asdas flag_name=0 asdas", false);
-  TestFlag(true, "    --flag_name=0   ", false);
+  TestFlag(false, "flag_name=1", true);
   TestFlag(false, "flag_name=yes", true);
   TestFlag(false, "flag_name=true", true);
+  TestFlag(true, "flag_name=0", false);
   TestFlag(true, "flag_name=no", false);
   TestFlag(true, "flag_name=false", false);
 }
 
 TEST(SanitizerCommon, IntFlags) {
   TestFlag(-11, 0, -11);
-  TestFlag(-11, "flag_name", -11);
-  TestFlag(-11, "--flag_name=", 0);
-  TestFlag(-11, "--flag_name=42", 42);
-  TestFlag(-11, "--flag_name=-42", -42);
+  TestFlag(-11, "flag_name=0", 0);
+  TestFlag(-11, "flag_name=42", 42);
+  TestFlag(-11, "flag_name=-42", -42);
+
+  // Unrecognized flags are ignored.
+  TestFlag(-11, "--flag_name=42", -11);
+  TestFlag(-11, "zzzzzzz=42", -11);
+
+  EXPECT_DEATH(TestFlag(-11, "flag_name", 0), "expected '='");
+  EXPECT_DEATH(TestFlag(-11, "flag_name=42U", 0),
+               "Invalid value for int option");
 }
 
 TEST(SanitizerCommon, StrFlags) {
-  TestStrFlag("zzz", 0, "zzz");
-  TestStrFlag("zzz", "flag_name", "zzz");
-  TestStrFlag("zzz", "--flag_name=", "");
-  TestStrFlag("", "--flag_name=abc", "abc");
-  TestStrFlag("", "--flag_name='abc zxc'", "abc zxc");
-  TestStrFlag("", "--flag_name='abc zxcc'", "abc zxcc");
-  TestStrFlag("", "--flag_name=\"abc qwe\" asd", "abc qwe");
-  TestStrFlag("", "other_flag_name=zzz", "");
+  TestFlag("zzz", 0, "zzz");
+  TestFlag("zzz", "flag_name=", "");
+  TestFlag("zzz", "flag_name=abc", "abc");
+  TestFlag("", "flag_name=abc", "abc");
+  TestFlag("", "flag_name='abc zxc'", "abc zxc");
+  // TestStrFlag("", "flag_name=\"abc qwe\" asd", "abc qwe");
 }
 
 static void TestTwoFlags(const char *env, bool expected_flag1,
-                         const char *expected_flag2) {
+                         const char *expected_flag2,
+                         const char *name1 = "flag1",
+                         const char *name2 = "flag2") {
   bool flag1 = !expected_flag1;
   const char *flag2 = "";
-  ParseFlag(env, &flag1, "flag1", "flag1 description");
-  ParseFlag(env, &flag2, "flag2", "flag2 description");
+
+  FlagParser parser;
+  RegisterFlag(&parser, name1, kFlagDesc, &flag1);
+  RegisterFlag(&parser, name2, kFlagDesc, &flag2);
+
+  parser.ParseString(env);
+
   EXPECT_EQ(expected_flag1, flag1);
   EXPECT_EQ(0, internal_strcmp(flag2, expected_flag2));
 }
@@ -81,6 +104,39 @@ TEST(SanitizerCommon, MultipleFlags) {
   TestTwoFlags("flag2='qxx' flag1=0", false, "qxx");
   TestTwoFlags("flag1=false:flag2='zzz'", false, "zzz");
   TestTwoFlags("flag2=qxx:flag1=yes", true, "qxx");
+  TestTwoFlags("flag2=qxx\nflag1=yes", true, "qxx");
+  TestTwoFlags("flag2=qxx\r\nflag1=yes", true, "qxx");
+  TestTwoFlags("flag2=qxx\tflag1=yes", true, "qxx");
+}
+
+TEST(SanitizerCommon, CommonSuffixFlags) {
+  TestTwoFlags("flag=1 other_flag='zzz'", true, "zzz", "flag", "other_flag");
+  TestTwoFlags("other_flag='zzz' flag=1", true, "zzz", "flag", "other_flag");
+  TestTwoFlags("other_flag=' flag=0 ' flag=1", true, " flag=0 ", "flag",
+               "other_flag");
+  TestTwoFlags("flag=1 other_flag=' flag=0 '", true, " flag=0 ", "flag",
+               "other_flag");
+}
+
+TEST(SanitizerCommon, CommonFlags) {
+  CommonFlags cf;
+  FlagParser parser;
+  RegisterCommonFlags(&parser, &cf);
+
+  cf.SetDefaults();
+  EXPECT_TRUE(cf.symbolize);
+  EXPECT_STREQ(".", cf.coverage_dir);
+
+  cf.symbolize = false;
+  cf.coverage = true;
+  cf.coverage_direct = true;
+  cf.log_path = "path/one";
+
+  parser.ParseString("symbolize=1:coverage_direct=false log_path='path/two'");
+  EXPECT_TRUE(cf.symbolize);
+  EXPECT_TRUE(cf.coverage);
+  EXPECT_FALSE(cf.coverage_direct);
+  EXPECT_STREQ("path/two", cf.log_path);
 }
 
 }  // namespace __sanitizer
diff --git a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_libc_test.cc b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_libc_test.cc
index 660710d5bb7e..8712d2c1b2a5 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_libc_test.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_libc_test.cc
@@ -55,6 +55,19 @@ struct stat_and_more {
   unsigned char z;
 };
 
+static void temp_file_name(char *buf, size_t bufsize, const char *prefix) {
+  const char *tmpdir = "/tmp";
+#if SANITIZER_ANDROID
+  // I don't know a way to query temp directory location on Android without
+  // going through Java interfaces. The code below is not ideal, but should
+  // work. May require "adb root", but it is needed for almost any use of ASan
+  // on Android already.
+  tmpdir = GetEnv("EXTERNAL_STORAGE");
+#endif
+  u32 uid = GetUid();
+  internal_snprintf(buf, bufsize, "%s/%s%d", tmpdir, prefix, uid);
+}
+
 // FIXME: File manipulations are not yet supported on Windows
 #if !defined(_WIN32)
 TEST(SanitizerCommon, FileOps) {
@@ -63,28 +76,16 @@ TEST(SanitizerCommon, FileOps) {
   const char *str2 = "zxcv";
   uptr len2 = internal_strlen(str2);
 
-  u32 uid = GetUid();
-  char temp_filename[128];
-#if SANITIZER_ANDROID
-  // I don't know a way to query temp directory location on Android without
-  // going through Java interfaces. The code below is not ideal, but should
-  // work. May require "adb root", but it is needed for almost any use of ASan
-  // on Android already.
-  internal_snprintf(temp_filename, sizeof(temp_filename),
-                    "%s/sanitizer_common.tmp.%d",
-                    GetEnv("EXTERNAL_STORAGE"), uid);
-#else
-  internal_snprintf(temp_filename, sizeof(temp_filename),
-                    "/tmp/sanitizer_common.tmp.%d", uid);
-#endif
-  uptr openrv = OpenFile(temp_filename, true);
+  char tmpfile[128];
+  temp_file_name(tmpfile, sizeof(tmpfile), "sanitizer_common.fileops.tmp.");
+  uptr openrv = OpenFile(tmpfile, true);
   EXPECT_FALSE(internal_iserror(openrv));
   fd_t fd = openrv;
   EXPECT_EQ(len1, internal_write(fd, str1, len1));
   EXPECT_EQ(len2, internal_write(fd, str2, len2));
   internal_close(fd);
 
-  openrv = OpenFile(temp_filename, false);
+  openrv = OpenFile(tmpfile, false);
   EXPECT_FALSE(internal_iserror(openrv));
   fd = openrv;
   uptr fsize = internal_filesize(fd);
@@ -92,8 +93,8 @@ TEST(SanitizerCommon, FileOps) {
 
 #if SANITIZER_TEST_HAS_STAT_H
   struct stat st1, st2, st3;
-  EXPECT_EQ(0u, internal_stat(temp_filename, &st1));
-  EXPECT_EQ(0u, internal_lstat(temp_filename, &st2));
+  EXPECT_EQ(0u, internal_stat(tmpfile, &st1));
+  EXPECT_EQ(0u, internal_lstat(tmpfile, &st2));
   EXPECT_EQ(0u, internal_fstat(fd, &st3));
   EXPECT_EQ(fsize, (uptr)st3.st_size);
 
@@ -115,6 +116,7 @@ TEST(SanitizerCommon, FileOps) {
   EXPECT_EQ(len2, internal_read(fd, buf, len2));
   EXPECT_EQ(0, internal_memcmp(buf, str2, len2));
   internal_close(fd);
+  internal_unlink(tmpfile);
 }
 #endif
 
@@ -125,3 +127,35 @@ TEST(SanitizerCommon, InternalStrFunctions) {
   EXPECT_EQ(0, internal_strchr(haystack, 'z'));
   EXPECT_EQ(haystack + 8, internal_strchrnul(haystack, 'z'));
 }
+
+// FIXME: File manipulations are not yet supported on Windows
+#if !defined(_WIN32) && !SANITIZER_MAC
+TEST(SanitizerCommon, InternalMmapWithOffset) {
+  char tmpfile[128];
+  temp_file_name(tmpfile, sizeof(tmpfile),
+                 "sanitizer_common.internalmmapwithoffset.tmp.");
+  uptr res = OpenFile(tmpfile, true);
+  ASSERT_FALSE(internal_iserror(res));
+  fd_t fd = res;
+
+  uptr page_size = GetPageSizeCached();
+  res = internal_ftruncate(fd, page_size * 2);
+  ASSERT_FALSE(internal_iserror(res));
+
+  res = internal_lseek(fd, page_size, SEEK_SET);
+  ASSERT_FALSE(internal_iserror(res));
+
+  res = internal_write(fd, "AB", 2);
+  ASSERT_FALSE(internal_iserror(res));
+
+  char *p = (char *)MapWritableFileToMemory(nullptr, page_size, fd, page_size);
+  ASSERT_NE(nullptr, p);
+
+  ASSERT_EQ('A', p[0]);
+  ASSERT_EQ('B', p[1]);
+
+  internal_close(fd);
+  internal_munmap(p, page_size);
+  internal_unlink(tmpfile);
+}
+#endif
diff --git a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_printf_test.cc b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_printf_test.cc
index d0b46ac94ff2..5e39e0a591d6 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_printf_test.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_printf_test.cc
@@ -28,14 +28,11 @@ TEST(Printf, Basic) {
       (unsigned)10, (unsigned long)11, // NOLINT
       (void*)0x123, "_string_");
   EXPECT_EQ(len, strlen(buf));
-  void *ptr;
-  if (sizeof(ptr) == 4) {
-    EXPECT_STREQ("a-1b-2c4294967292e5fahbq"
-                 "0x00000123e_string_r", buf);
-  } else {
-    EXPECT_STREQ("a-1b-2c4294967292e5fahbq"
-                 "0x000000000123e_string_r", buf);
-  }
+
+  std::string expectedString = "a-1b-2c4294967292e5fahbq0x";
+  expectedString += std::string(SANITIZER_POINTER_FORMAT_LENGTH - 3, '0');
+  expectedString += "123e_string_r";
+  EXPECT_STREQ(expectedString.c_str(), buf);
 }
 
 TEST(Printf, OverflowStr) {
diff --git a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_procmaps_test.cc b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_procmaps_test.cc
index 495b726dcc45..abe4ef43093f 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_procmaps_test.cc
+++ b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_procmaps_test.cc
@@ -48,6 +48,7 @@ TEST(MemoryMappingLayout, DumpListOfModules) {
       if (strstr(modules[i].full_name(), binary_name) != 0)
         found = true;
     }
+    modules[i].clear();
   }
   EXPECT_TRUE(found);
   free(modules);
diff --git a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_test_utils.h b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_test_utils.h
index 64db37f341d3..9c162a66f547 100644
--- a/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_test_utils.h
+++ b/contrib/compiler-rt/lib/sanitizer_common/tests/sanitizer_test_utils.h
@@ -118,4 +118,10 @@ static inline uint32_t my_rand() {
 # define SANITIZER_TEST_HAS_STRNLEN 0
 #endif
 
+#if defined(__FreeBSD__)
+# define SANITIZER_TEST_HAS_PRINTF_L 1
+#else
+# define SANITIZER_TEST_HAS_PRINTF_L 0
+#endif
+
 #endif  // SANITIZER_TEST_UTILS_H
diff --git a/contrib/compiler-rt/lib/tsan/Makefile.old b/contrib/compiler-rt/lib/tsan/Makefile.old
deleted file mode 100644
index b982e663a0cf..000000000000
--- a/contrib/compiler-rt/lib/tsan/Makefile.old
+++ /dev/null
@@ -1,106 +0,0 @@
-DEBUG=0
-LDFLAGS=-ldl -lrt -lpthread -pie
-CXXFLAGS = -std=c++11 -fPIE -fno-rtti -g -Wall -Werror \
-					 -DGTEST_HAS_RTTI=0 -DTSAN_DEBUG=$(DEBUG) -DSANITIZER_DEBUG=$(DEBUG)
-CLANG=clang
-FILECHECK=FileCheck
-# Silence warnings that Clang produces for gtest code.
-# Use -Wno-attributes so that gcc doesn't complain about unknown warning types.
-CXXFLAGS += -Wno-attributes
-ifeq ($(DEBUG), 0)
-	CXXFLAGS += -O3
-endif
-ifeq ($(CXX), $(CLANG)++)
-  CXXFLAGS+= -Wno-unused-private-field -Wno-static-in-inline -Wgnu
-endif
-
-LIBTSAN=rtl/libtsan.a
-GTEST_ROOT=third_party/googletest
-GTEST_INCLUDE=-I$(GTEST_ROOT)/include
-GTEST_BUILD_DIR=$(GTEST_ROOT)/build
-GTEST_LIB_NAME=gtest-all.o
-GTEST_LIB=$(GTEST_BUILD_DIR)/$(GTEST_LIB_NAME)
-
-SANITIZER_TESTS_PATH=../sanitizer_common/tests
-SANITIZER_COMMON_TESTS_SRC=$(wildcard $(SANITIZER_TESTS_PATH)/*_test.cc)
-SANITIZER_COMMON_EXCLUDED_TESTS=$(SANITIZER_TESTS_PATH)/sanitizer_nolibc_test.cc
-SANITIZER_COMMON_GOOD_TESTS=$(filter-out $(SANITIZER_COMMON_EXCLUDED_TESTS), $(SANITIZER_COMMON_TESTS_SRC))
-SANITIZER_COMMON_TESTS_OBJ=$(patsubst %.cc,%.o,$(SANITIZER_COMMON_GOOD_TESTS))
-RTL_TEST_SRC=$(wildcard tests/rtl/*.cc)
-RTL_TEST_OBJ=$(patsubst %.cc,%.o,$(RTL_TEST_SRC))
-UNIT_TEST_SRC=$(wildcard tests/unit/*_test.cc)
-UNIT_TEST_OBJ=$(patsubst %.cc,%.o,$(UNIT_TEST_SRC))
-UNIT_TEST_HDR=$(wildcard rtl/*.h) $(wildcard ../sanitizer_common/*.h)
-LIT_TESTS_PATH=../../test/tsan
-
-INCLUDES=-Irtl -I.. -I../../include $(GTEST_INCLUDE)
-
-all: libtsan test
-
-help:
-	@ echo "A little help is always welcome!"
-	@ echo "The most useful targets are:"
-	@ echo "  make install_deps  # Install third-party dependencies required for building"
-	@ echo "  make presubmit     # Run it every time before committing"
-	@ echo
-	@ echo "For more info, see http://code.google.com/p/thread-sanitizer/wiki/Development"
-
-$(LIBTSAN): libtsan
-
-libtsan:
-	$(MAKE) -C rtl -f Makefile.old DEBUG=$(DEBUG)
-
-%.o: %.cc $(UNIT_TEST_HDR) $(LIBTSAN)
-	$(CXX) $(CXXFLAGS) $(CFLAGS) $(INCLUDES) -o $@ -c $<
-
-tsan_test: $(UNIT_TEST_OBJ) $(RTL_TEST_OBJ) \
-           $(SANITIZER_COMMON_TESTS_OBJ) $(LIBTSAN) $(GTEST_LIB)
-	$(CXX) -Wl,--whole-archive $^ -Wl,--no-whole-archive -o $@ $(LDFLAGS)
-
-test: libtsan tsan_test
-
-run: all
-	(ulimit -s 8192; ./tsan_test)
-	CC=$(CLANG) CXX=$(CLANG)++ FILECHECK=$(FILECHECK) $(LIT_TESTS_PATH)/test_output.sh
-
-presubmit:
-	../sanitizer_common/scripts/check_lint.sh
-	# Debug build with clang.
-	$(MAKE) -f Makefile.old clean
-	$(MAKE) -f Makefile.old run DEBUG=1 -j 16 CC=$(CLANG) CXX=$(CLANG)++
-	# Release build with clang.
-	$(MAKE) -f Makefile.old clean
-	$(MAKE) -f Makefile.old run DEBUG=0 -j 16 CC=$(CLANG) CXX=$(CLANG)++
-	./check_memcpy.sh
-	# Debug build with gcc
-	$(MAKE) -f Makefile.old clean
-	$(MAKE) -f Makefile.old run DEBUG=1 -j 16 CC=gcc CXX=g++
-	# Release build with gcc
-	$(MAKE) -f Makefile.old clean
-	$(MAKE) -f Makefile.old run DEBUG=0 -j 16 CC=gcc CXX=g++
-	./check_memcpy.sh
-	./check_analyze.sh
-	# Sanity check for Go runtime
-	(cd go && ./buildgo.sh)
-	# Check cmake build
-	./check_cmake.sh
-	@ echo PRESUBMIT PASSED
-
-install_deps:
-	rm -rf third_party
-	mkdir third_party
-	(cd third_party && \
-	svn co -r613 http://googletest.googlecode.com/svn/trunk googletest \
-        )
-
-$(GTEST_LIB):
-	mkdir -p $(GTEST_BUILD_DIR) && \
-	cd $(GTEST_BUILD_DIR) && \
-	$(MAKE) -f ../make/Makefile CXXFLAGS="$(CXXFLAGS)" CFLAGS="$(CFLAGS)" CC=$(CC) CXX=$(CXX) $(GTEST_LIB_NAME)
-
-clean:
-	rm -f asm_*.s libtsan.nm libtsan.objdump */*.o tsan_test
-	rm -rf $(GTEST_BUILD_DIR)
-	$(MAKE) clean -C rtl -f Makefile.old
-	rm -f go/*.s
-	rm -rf build
diff --git a/contrib/compiler-rt/lib/tsan/check_analyze.sh b/contrib/compiler-rt/lib/tsan/check_analyze.sh
index 08bfc7a76313..4b33393ef648 100755
--- a/contrib/compiler-rt/lib/tsan/check_analyze.sh
+++ b/contrib/compiler-rt/lib/tsan/check_analyze.sh
@@ -8,17 +8,6 @@ PrintRes() {
 
 PrintRes
 
-wmops="write1 \
-      write2 \
-      write4 \
-      write8"
-rmops="read1 \
-      read2 \
-      read4 \
-      read8"
-func="func_entry \
-      func_exit"
-
 check() {
   res=$(PrintRes | egrep "$1 .* $2 $3; ")
   if [ "$res" == "" ]; then
@@ -27,19 +16,25 @@ check() {
   fi
 }
 
-for f in $wmops; do
-  check $f rsp 3
-  check $f push 1
-  check $f pop 5
+for f in write1; do
+  check $f rsp 1
+  check $f push 2
+  check $f pop 2
 done
 
-for f in $rmops; do
-  check $f rsp 3
-  check $f push 1
-  check $f pop 4
+for f in write2 write4 write8; do
+  check $f rsp 1
+  check $f push 3
+  check $f pop 3
+done
+
+for f in read1 read2 read4 read8; do
+  check $f rsp 1
+  check $f push 5
+  check $f pop 5
 done
 
-for f in $func; do
+for f in func_entry func_exit; do
   check $f rsp 0
   check $f push 0
   check $f pop 0
diff --git a/contrib/compiler-rt/lib/tsan/dd/dd_rtl.cc b/contrib/compiler-rt/lib/tsan/dd/dd_rtl.cc
index 41b75bf755b8..2ba1ee324111 100644
--- a/contrib/compiler-rt/lib/tsan/dd/dd_rtl.cc
+++ b/contrib/compiler-rt/lib/tsan/dd/dd_rtl.cc
@@ -11,6 +11,7 @@
 #include "sanitizer_common/sanitizer_common.h"
 #include "sanitizer_common/sanitizer_placement_new.h"
 #include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_flag_parser.h"
 #include "sanitizer_common/sanitizer_stacktrace.h"
 #include "sanitizer_common/sanitizer_stackdepot.h"
 
@@ -70,14 +71,21 @@ void InitializeFlags(Flags *f, const char *env) {
   // Default values.
   f->second_deadlock_stack = false;
 
-  CommonFlags *cf = common_flags();
-  SetCommonFlagsDefaults(cf);
-  // Override some common flags defaults.
-  cf->allow_addr2line = true;
+  SetCommonFlagsDefaults();
+  {
+    // Override some common flags defaults.
+    CommonFlags cf;
+    cf.CopyFrom(*common_flags());
+    cf.allow_addr2line = true;
+    OverrideCommonFlags(cf);
+  }
 
   // Override from command line.
-  ParseFlag(env, &f->second_deadlock_stack, "second_deadlock_stack", "");
-  ParseCommonFlagsFromString(cf, env);
+  FlagParser parser;
+  RegisterFlag(&parser, "second_deadlock_stack", "", &f->second_deadlock_stack);
+  RegisterCommonFlags(&parser);
+  parser.ParseString(env);
+  SetVerbosity(common_flags()->verbosity);
 }
 
 void Initialize() {
diff --git a/contrib/compiler-rt/lib/tsan/go/build.bat b/contrib/compiler-rt/lib/tsan/go/build.bat
index 8f8087fc6352..9b350a2d633e 100644
--- a/contrib/compiler-rt/lib/tsan/go/build.bat
+++ b/contrib/compiler-rt/lib/tsan/go/build.bat
@@ -1,4 +1,4 @@
 type tsan_go.cc ..\rtl\tsan_interface_atomic.cc ..\rtl\tsan_clock.cc ..\rtl\tsan_flags.cc ..\rtl\tsan_md5.cc ..\rtl\tsan_mutex.cc ..\rtl\tsan_report.cc ..\rtl\tsan_rtl.cc ..\rtl\tsan_rtl_mutex.cc ..\rtl\tsan_rtl_report.cc ..\rtl\tsan_rtl_thread.cc ..\rtl\tsan_stat.cc ..\rtl\tsan_suppressions.cc ..\rtl\tsan_sync.cc ..\rtl\tsan_stack_trace.cc ..\..\sanitizer_common\sanitizer_allocator.cc ..\..\sanitizer_common\sanitizer_common.cc ..\..\sanitizer_common\sanitizer_flags.cc ..\..\sanitizer_common\sanitizer_stacktrace.cc ..\..\sanitizer_common\sanitizer_libc.cc ..\..\sanitizer_common\sanitizer_printf.cc ..\..\sanitizer_common\sanitizer_suppressions.cc ..\..\sanitizer_common\sanitizer_thread_registry.cc ..\rtl\tsan_platform_windows.cc ..\..\sanitizer_common\sanitizer_win.cc ..\..\sanitizer_common\sanitizer_deadlock_detector1.cc ..\..\sanitizer_common\sanitizer_stackdepot.cc ..\..\sanitizer_common\sanitizer_persistent_allocator.cc > gotsan.cc
 
-gcc -c -o race_windows_amd64.syso gotsan.cc -I..\rtl -I..\.. -I..\..\sanitizer_common -I..\..\..\include -m64 -Wall -fno-exceptions -fno-rtti -DSANITIZER_GO -DTSAN_SHADOW_COUNT=4 -Wno-error=attributes -Wno-attributes -Wno-format -DTSAN_DEBUG=0 -O3 -fomit-frame-pointer
+gcc -c -o race_windows_amd64.syso gotsan.cc -I..\rtl -I..\.. -I..\..\sanitizer_common -I..\..\..\include -m64 -Wall -fno-exceptions -fno-rtti -DSANITIZER_GO -Wno-error=attributes -Wno-attributes -Wno-format -DSANITIZER_DEBUG=0 -O3 -fomit-frame-pointer
 
diff --git a/contrib/compiler-rt/lib/tsan/go/buildgo.sh b/contrib/compiler-rt/lib/tsan/go/buildgo.sh
index 4df2e96c5a8c..e00408cb10f0 100755
--- a/contrib/compiler-rt/lib/tsan/go/buildgo.sh
+++ b/contrib/compiler-rt/lib/tsan/go/buildgo.sh
@@ -1,3 +1,5 @@
+#!/bin/sh
+
 set -e
 
 SRCS="
@@ -19,6 +21,7 @@ SRCS="
 	../../sanitizer_common/sanitizer_allocator.cc
 	../../sanitizer_common/sanitizer_common.cc
 	../../sanitizer_common/sanitizer_deadlock_detector2.cc
+	../../sanitizer_common/sanitizer_flag_parser.cc
 	../../sanitizer_common/sanitizer_flags.cc
 	../../sanitizer_common/sanitizer_libc.cc
 	../../sanitizer_common/sanitizer_persistent_allocator.cc
@@ -34,33 +37,38 @@ if [ "`uname -a | grep Linux`" != "" ]; then
 	SUFFIX="linux_amd64"
 	OSCFLAGS="-fPIC -ffreestanding -Wno-maybe-uninitialized -Wno-unused-const-variable -Werror -Wno-unknown-warning-option"
 	OSLDFLAGS="-lpthread -fPIC -fpie"
-	SRCS+="
+	SRCS="
+		$SRCS
 		../rtl/tsan_platform_linux.cc
 		../../sanitizer_common/sanitizer_posix.cc
 		../../sanitizer_common/sanitizer_posix_libcdep.cc
 		../../sanitizer_common/sanitizer_procmaps_common.cc
 		../../sanitizer_common/sanitizer_procmaps_linux.cc
 		../../sanitizer_common/sanitizer_linux.cc
+		../../sanitizer_common/sanitizer_linux_libcdep.cc
 		../../sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc
 	"
 elif [ "`uname -a | grep FreeBSD`" != "" ]; then
         SUFFIX="freebsd_amd64"
         OSCFLAGS="-fno-strict-aliasing -fPIC -Werror"
         OSLDFLAGS="-lpthread -fPIC -fpie"
-        SRCS+="
+        SRCS="
+                $SRCS
                 ../rtl/tsan_platform_linux.cc
                 ../../sanitizer_common/sanitizer_posix.cc
                 ../../sanitizer_common/sanitizer_posix_libcdep.cc
                 ../../sanitizer_common/sanitizer_procmaps_common.cc
                 ../../sanitizer_common/sanitizer_procmaps_freebsd.cc
                 ../../sanitizer_common/sanitizer_linux.cc
+                ../../sanitizer_common/sanitizer_linux_libcdep.cc
                 ../../sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc
         "
 elif [ "`uname -a | grep Darwin`" != "" ]; then
 	SUFFIX="darwin_amd64"
 	OSCFLAGS="-fPIC -Wno-unused-const-variable -Wno-unknown-warning-option"
 	OSLDFLAGS="-lpthread -fPIC -fpie"
-	SRCS+="
+	SRCS="
+		$SRCS
 		../rtl/tsan_platform_mac.cc
 		../../sanitizer_common/sanitizer_mac.cc
 		../../sanitizer_common/sanitizer_posix.cc
@@ -71,7 +79,8 @@ elif [ "`uname -a | grep MINGW`" != "" ]; then
 	SUFFIX="windows_amd64"
 	OSCFLAGS="-Wno-error=attributes -Wno-attributes -Wno-unused-const-variable -Wno-unknown-warning-option"
 	OSLDFLAGS=""
-	SRCS+="
+	SRCS="
+		$SRCS
 		../rtl/tsan_platform_windows.cc
 		../../sanitizer_common/sanitizer_win.cc
 	"
@@ -80,24 +89,44 @@ else
 	exit 1
 fi
 
-SRCS+=$ADD_SRCS
+CC=${CC:-gcc}
+IN_TMPDIR=${IN_TMPDIR:-0}
+SILENT=${SILENT:-0}
+
+if [ $IN_TMPDIR != "0" ]; then
+  DIR=$(mktemp -qd /tmp/gotsan.XXXXXXXXXX)
+  cleanup() {
+    rm -rf $DIR
+  }
+  trap cleanup EXIT
+else
+  DIR=.
+fi
+
+SRCS="$SRCS $ADD_SRCS"
 
-rm -f gotsan.cc
+rm -f $DIR/gotsan.cc
 for F in $SRCS; do
-	cat $F >> gotsan.cc
+	cat $F >> $DIR/gotsan.cc
 done
 
-FLAGS=" -I../rtl -I../.. -I../../sanitizer_common -I../../../include -std=c++11 -m64 -Wall -fno-exceptions -fno-rtti -DSANITIZER_GO -DTSAN_SHADOW_COUNT=4 -DSANITIZER_DEADLOCK_DETECTOR_VERSION=2 $OSCFLAGS"
-if [ "$DEBUG" == "" ]; then
-	FLAGS+=" -DTSAN_DEBUG=0 -O3 -msse3 -fomit-frame-pointer"
+FLAGS=" -I../rtl -I../.. -I../../sanitizer_common -I../../../include -std=c++11 -m64 -Wall -fno-exceptions -fno-rtti -DSANITIZER_GO -DSANITIZER_DEADLOCK_DETECTOR_VERSION=2 $OSCFLAGS"
+if [ "$DEBUG" = "" ]; then
+	FLAGS="$FLAGS -DSANITIZER_DEBUG=0 -O3 -msse3 -fomit-frame-pointer"
 else
-	FLAGS+=" -DTSAN_DEBUG=1 -g"
+	FLAGS="$FLAGS -DSANITIZER_DEBUG=1 -g"
 fi
 
-CC=${CC:-gcc}
+if [ "$SILENT" != "1" ]; then
+  echo $CC gotsan.cc -c -o $DIR/race_$SUFFIX.syso $FLAGS $CFLAGS
+fi
+$CC $DIR/gotsan.cc -c -o $DIR/race_$SUFFIX.syso $FLAGS $CFLAGS
 
-echo $CC gotsan.cc -c -o race_$SUFFIX.syso $FLAGS $CFLAGS
-$CC gotsan.cc -c -o race_$SUFFIX.syso $FLAGS $CFLAGS
+$CC test.c $DIR/race_$SUFFIX.syso -m64 -o $DIR/test $OSLDFLAGS
 
-$CC test.c race_$SUFFIX.syso -m64 -o test $OSLDFLAGS
-GORACE="exitcode=0 atexit_sleep_ms=0" ./test
+export GORACE="exitcode=0 atexit_sleep_ms=0"
+if [ "$SILENT" != "1" ]; then
+  $DIR/test
+else
+  $DIR/test 2>/dev/null
+fi
diff --git a/contrib/compiler-rt/lib/tsan/go/tsan_go.cc b/contrib/compiler-rt/lib/tsan/go/tsan_go.cc
index cccf72cedd27..ea0beb74215b 100644
--- a/contrib/compiler-rt/lib/tsan/go/tsan_go.cc
+++ b/contrib/compiler-rt/lib/tsan/go/tsan_go.cc
@@ -28,13 +28,6 @@ bool IsExpectedReport(uptr addr, uptr size) {
   return false;
 }
 
-void *internal_start_thread(void(*func)(void*), void *arg) {
-  return 0;
-}
-
-void internal_join_thread(void *th) {
-}
-
 ReportLocation *SymbolizeData(uptr addr) {
   return 0;
 }
diff --git a/contrib/compiler-rt/lib/tsan/rtl/Makefile.old b/contrib/compiler-rt/lib/tsan/rtl/Makefile.old
deleted file mode 100644
index 79c761ce3f4e..000000000000
--- a/contrib/compiler-rt/lib/tsan/rtl/Makefile.old
+++ /dev/null
@@ -1,62 +0,0 @@
-CXXFLAGS = -std=c++11 -fPIE -g -Wall -Werror -fno-builtin -msse3 -DTSAN_DEBUG=$(DEBUG) -DSANITIZER_DEBUG=$(DEBUG)
-CLANG=clang
-ifeq ($(DEBUG), 0)
-  CXXFLAGS += -O3
-endif
-
-# For interception. FIXME: move interception one level higher.
-INTERCEPTION=../../interception
-COMMON=../../sanitizer_common
-INCLUDES= -I../.. -I../../../include
-EXTRA_CXXFLAGS=-fno-exceptions -fno-rtti
-NO_SYSROOT=--sysroot=.
-CXXFLAGS+=$(EXTRA_CXXFLAGS)
-CXXFLAGS+=$(CFLAGS)
-ifeq ($(DEBUG), 0)
-  CXXFLAGS+=-fomit-frame-pointer
-ifeq ($(CXX), g++)
-  CXXFLAGS+=-Wframe-larger-than=512
-endif  # CXX=g++
-endif  # DEBUG=0
-
-ifeq ($(CXX), $(CLANG)++)
-  # Global constructors are banned.
-  CXXFLAGS+=-Wglobal-constructors
-endif
-
-
-
-all: libtsan.a
-
-LIBTSAN_HEADERS=$(wildcard *.h) \
-		$(wildcard $(INTERCEPTION)/*.h) \
-		$(wildcard $(COMMON)/*.h)
-LIBTSAN_SRC=$(wildcard *.cc)
-LIBTSAN_ASM_SRC=$(wildcard *.S)
-INTERCEPTION_SRC=$(wildcard $(INTERCEPTION)/*.cc)
-COMMON_SRC=$(wildcard $(COMMON)/*.cc)
-
-LIBTSAN_OBJ=$(patsubst %.cc,%.o,$(LIBTSAN_SRC)) \
-	    $(patsubst %.S,%.o,$(LIBTSAN_ASM_SRC)) \
-	    $(patsubst $(INTERCEPTION)/%.cc,%.o,$(INTERCEPTION_SRC)) \
-	    $(patsubst $(COMMON)/%.cc,%.o,$(COMMON_SRC))
-
-%_linux.o: %_linux.cc Makefile.old $(LIBTSAN_HEADERS)
-	$(CXX) $(CXXFLAGS) $(INCLUDES) -c $<
-%.o: %.cc Makefile.old $(LIBTSAN_HEADERS)
-	$(CXX) $(CXXFLAGS) $(INCLUDES) $(NO_SYSROOT) -c $<
-%.o: $(INTERCEPTION)/%.cc Makefile.old $(LIBTSAN_HEADERS)
-	$(CXX) $(CXXFLAGS) $(INCLUDES) -c $< -o $@
-%.o: $(COMMON)/%.cc Makefile.old $(LIBTSAN_HEADERS)
-	$(CXX) $(CXXFLAGS) $(INCLUDES) -c $< -o $@
-%.o: %.S
-	$(CXX) $(INCLUDES) -o $@ -c $<
-
-libtsan.a: $(LIBTSAN_OBJ)
-	ar ru $@ $(LIBTSAN_OBJ)
-
-libtsan_dummy.a: tsan_dummy_rtl.o
-	ar ru $@ $<
-
-clean:
-	rm -f *.o *.a
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_clock.cc b/contrib/compiler-rt/lib/tsan/rtl/tsan_clock.cc
index f2b39a182b39..59e3de435f1b 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_clock.cc
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_clock.cc
@@ -104,8 +104,8 @@ ThreadClock::ThreadClock(unsigned tid, unsigned reused)
 }
 
 void ThreadClock::acquire(ClockCache *c, const SyncClock *src) {
-  DCHECK(nclk_ <= kMaxTid);
-  DCHECK(src->size_ <= kMaxTid);
+  DCHECK_LE(nclk_, kMaxTid);
+  DCHECK_LE(src->size_, kMaxTid);
   CPP_STAT_INC(StatClockAcquire);
 
   // Check if it's empty -> no need to do anything.
@@ -215,8 +215,8 @@ void ThreadClock::release(ClockCache *c, SyncClock *dst) const {
 }
 
 void ThreadClock::ReleaseStore(ClockCache *c, SyncClock *dst) const {
-  DCHECK(nclk_ <= kMaxTid);
-  DCHECK(dst->size_ <= kMaxTid);
+  DCHECK_LE(nclk_, kMaxTid);
+  DCHECK_LE(dst->size_, kMaxTid);
   CPP_STAT_INC(StatClockStore);
 
   // Check if we need to resize dst.
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_defs.h b/contrib/compiler-rt/lib/tsan/rtl/tsan_defs.h
index 7ed3796b5012..f19aee999332 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_defs.h
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_defs.h
@@ -18,10 +18,6 @@
 #include "sanitizer_common/sanitizer_libc.h"
 #include "tsan_stat.h"
 
-#ifndef TSAN_DEBUG
-#define TSAN_DEBUG 0
-#endif  // TSAN_DEBUG
-
 namespace __tsan {
 
 #ifdef SANITIZER_GO
@@ -44,18 +40,8 @@ const int kClkBits = 42;
 const unsigned kMaxTidReuse = (1 << (64 - kClkBits)) - 1;
 const uptr kShadowStackSize = 64 * 1024;
 
-#ifdef TSAN_SHADOW_COUNT
-# if TSAN_SHADOW_COUNT == 2 \
-  || TSAN_SHADOW_COUNT == 4 || TSAN_SHADOW_COUNT == 8
-const uptr kShadowCnt = TSAN_SHADOW_COUNT;
-# else
-#   error "TSAN_SHADOW_COUNT must be one of 2,4,8"
-# endif
-#else
 // Count of shadow values in a shadow cell.
-#define TSAN_SHADOW_COUNT 4
 const uptr kShadowCnt = 4;
-#endif
 
 // That many user bytes are mapped onto a single shadow cell.
 const uptr kShadowCell = 8;
@@ -88,7 +74,7 @@ const bool kCollectStats = false;
 // The following "build consistency" machinery ensures that all source files
 // are built in the same configuration. Inconsistent builds lead to
 // hard to debug crashes.
-#if TSAN_DEBUG
+#if SANITIZER_DEBUG
 void build_consistency_debug();
 #else
 void build_consistency_release();
@@ -100,18 +86,8 @@ void build_consistency_stats();
 void build_consistency_nostats();
 #endif
 
-#if TSAN_SHADOW_COUNT == 1
-void build_consistency_shadow1();
-#elif TSAN_SHADOW_COUNT == 2
-void build_consistency_shadow2();
-#elif TSAN_SHADOW_COUNT == 4
-void build_consistency_shadow4();
-#else
-void build_consistency_shadow8();
-#endif
-
 static inline void USED build_consistency() {
-#if TSAN_DEBUG
+#if SANITIZER_DEBUG
   build_consistency_debug();
 #else
   build_consistency_release();
@@ -121,15 +97,6 @@ static inline void USED build_consistency() {
 #else
   build_consistency_nostats();
 #endif
-#if TSAN_SHADOW_COUNT == 1
-  build_consistency_shadow1();
-#elif TSAN_SHADOW_COUNT == 2
-  build_consistency_shadow2();
-#elif TSAN_SHADOW_COUNT == 4
-  build_consistency_shadow4();
-#else
-  build_consistency_shadow8();
-#endif
 }
 
 template<typename T>
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_flags.cc b/contrib/compiler-rt/lib/tsan/rtl/tsan_flags.cc
index 5dc331f59469..fed3de8db2ed 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_flags.cc
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_flags.cc
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_flag_parser.h"
 #include "sanitizer_common/sanitizer_libc.h"
 #include "tsan_flags.h"
 #include "tsan_rtl.h"
@@ -33,80 +34,44 @@ const char *WEAK __tsan_default_options() {
 }
 #endif
 
-static void ParseFlags(Flags *f, const char *env) {
-  ParseFlag(env, &f->enable_annotations, "enable_annotations", "");
-  ParseFlag(env, &f->suppress_equal_stacks, "suppress_equal_stacks", "");
-  ParseFlag(env, &f->suppress_equal_addresses, "suppress_equal_addresses", "");
-  ParseFlag(env, &f->report_bugs, "report_bugs", "");
-  ParseFlag(env, &f->report_thread_leaks, "report_thread_leaks", "");
-  ParseFlag(env, &f->report_destroy_locked, "report_destroy_locked", "");
-  ParseFlag(env, &f->report_mutex_bugs, "report_mutex_bugs", "");
-  ParseFlag(env, &f->report_signal_unsafe, "report_signal_unsafe", "");
-  ParseFlag(env, &f->report_atomic_races, "report_atomic_races", "");
-  ParseFlag(env, &f->force_seq_cst_atomics, "force_seq_cst_atomics", "");
-  ParseFlag(env, &f->print_benign, "print_benign", "");
-  ParseFlag(env, &f->exitcode, "exitcode", "");
-  ParseFlag(env, &f->halt_on_error, "halt_on_error", "");
-  ParseFlag(env, &f->atexit_sleep_ms, "atexit_sleep_ms", "");
-  ParseFlag(env, &f->profile_memory, "profile_memory", "");
-  ParseFlag(env, &f->flush_memory_ms, "flush_memory_ms", "");
-  ParseFlag(env, &f->flush_symbolizer_ms, "flush_symbolizer_ms", "");
-  ParseFlag(env, &f->memory_limit_mb, "memory_limit_mb", "");
-  ParseFlag(env, &f->stop_on_start, "stop_on_start", "");
-  ParseFlag(env, &f->running_on_valgrind, "running_on_valgrind", "");
-  ParseFlag(env, &f->history_size, "history_size", "");
-  ParseFlag(env, &f->io_sync, "io_sync", "");
-  ParseFlag(env, &f->die_after_fork, "die_after_fork", "");
-
+void Flags::SetDefaults() {
+#define TSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
+#include "tsan_flags.inc"
+#undef TSAN_FLAG
   // DDFlags
-  ParseFlag(env, &f->second_deadlock_stack, "second_deadlock_stack", "");
+  second_deadlock_stack = false;
 }
 
-void InitializeFlags(Flags *f, const char *env) {
-  internal_memset(f, 0, sizeof(*f));
-
-  // Default values.
-  f->enable_annotations = true;
-  f->suppress_equal_stacks = true;
-  f->suppress_equal_addresses = true;
-  f->report_bugs = true;
-  f->report_thread_leaks = true;
-  f->report_destroy_locked = true;
-  f->report_mutex_bugs = true;
-  f->report_signal_unsafe = true;
-  f->report_atomic_races = true;
-  f->force_seq_cst_atomics = false;
-  f->print_benign = false;
-  f->exitcode = 66;
-  f->halt_on_error = false;
-  f->atexit_sleep_ms = 1000;
-  f->profile_memory = "";
-  f->flush_memory_ms = 0;
-  f->flush_symbolizer_ms = 5000;
-  f->memory_limit_mb = 0;
-  f->stop_on_start = false;
-  f->running_on_valgrind = false;
-  f->history_size = kGoMode ? 1 : 2;  // There are a lot of goroutines in Go.
-  f->io_sync = 1;
-  f->die_after_fork = true;
-
-  // DDFlags
-  f->second_deadlock_stack = false;
+void RegisterTsanFlags(FlagParser *parser, Flags *f) {
+#define TSAN_FLAG(Type, Name, DefaultValue, Description) \
+  RegisterFlag(parser, #Name, Description, &f->Name);
+#include "tsan_flags.inc"
+#undef TSAN_FLAG
+}
 
-  CommonFlags *cf = common_flags();
-  SetCommonFlagsDefaults(cf);
-  // Override some common flags defaults.
-  cf->allow_addr2line = true;
-  cf->detect_deadlocks = true;
-  cf->print_suppressions = false;
-  cf->stack_trace_format = "    #%n %f %S %M";
+void InitializeFlags(Flags *f, const char *env) {
+  FlagParser parser;
+  RegisterTsanFlags(&parser, f);
+  RegisterCommonFlags(&parser);
+
+  f->SetDefaults();
+
+  SetCommonFlagsDefaults();
+  {
+    // Override some common flags defaults.
+    CommonFlags cf;
+    cf.CopyFrom(*common_flags());
+    cf.allow_addr2line = true;
+    cf.detect_deadlocks = true;
+    cf.print_suppressions = false;
+    cf.stack_trace_format = "    #%n %f %S %M";
+    OverrideCommonFlags(cf);
+  }
 
   // Let a frontend override.
-  ParseFlags(f, __tsan_default_options());
-  ParseCommonFlagsFromString(cf, __tsan_default_options());
+  parser.ParseString(__tsan_default_options());
   // Override from command line.
-  ParseFlags(f, env);
-  ParseCommonFlagsFromString(cf, env);
+  parser.ParseString(env);
 
   // Sanity check.
   if (!f->report_bugs) {
@@ -115,7 +80,11 @@ void InitializeFlags(Flags *f, const char *env) {
     f->report_signal_unsafe = false;
   }
 
-  if (cf->help) PrintFlagDescriptions();
+  SetVerbosity(common_flags()->verbosity);
+
+  if (Verbosity()) ReportUnrecognizedFlags();
+
+  if (common_flags()->help) parser.PrintFlagDescriptions();
 
   if (f->history_size < 0 || f->history_size > 7) {
     Printf("ThreadSanitizer: incorrect value for history_size"
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_flags.h b/contrib/compiler-rt/lib/tsan/rtl/tsan_flags.h
index 621ca139236f..e2f6b3c9f021 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_flags.h
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_flags.h
@@ -20,65 +20,12 @@
 namespace __tsan {
 
 struct Flags : DDFlags {
-  // Enable dynamic annotations, otherwise they are no-ops.
-  bool enable_annotations;
-  // Suppress a race report if we've already output another race report
-  // with the same stack.
-  bool suppress_equal_stacks;
-  // Suppress a race report if we've already output another race report
-  // on the same address.
-  bool suppress_equal_addresses;
-  // Turns off bug reporting entirely (useful for benchmarking).
-  bool report_bugs;
-  // Report thread leaks at exit?
-  bool report_thread_leaks;
-  // Report destruction of a locked mutex?
-  bool report_destroy_locked;
-  // Report incorrect usages of mutexes and mutex annotations?
-  bool report_mutex_bugs;
-  // Report violations of async signal-safety
-  // (e.g. malloc() call from a signal handler).
-  bool report_signal_unsafe;
-  // Report races between atomic and plain memory accesses.
-  bool report_atomic_races;
-  // If set, all atomics are effectively sequentially consistent (seq_cst),
-  // regardless of what user actually specified.
-  bool force_seq_cst_atomics;
-  // Print matched "benign" races at exit.
-  bool print_benign;
-  // Override exit status if something was reported.
-  int exitcode;
-  // Exit after first reported error.
-  bool halt_on_error;
-  // Sleep in main thread before exiting for that many ms
-  // (useful to catch "at exit" races).
-  int atexit_sleep_ms;
-  // If set, periodically write memory profile to that file.
-  const char *profile_memory;
-  // Flush shadow memory every X ms.
-  int flush_memory_ms;
-  // Flush symbolizer caches every X ms.
-  int flush_symbolizer_ms;
-  // Resident memory limit in MB to aim at.
-  // If the process consumes more memory, then TSan will flush shadow memory.
-  int memory_limit_mb;
-  // Stops on start until __tsan_resume() is called (for debugging).
-  bool stop_on_start;
-  // Controls whether RunningOnValgrind() returns true or false.
-  bool running_on_valgrind;
-  // Per-thread history size, controls how many previous memory accesses
-  // are remembered per thread.  Possible values are [0..7].
-  // history_size=0 amounts to 32K memory accesses.  Each next value doubles
-  // the amount of memory accesses, up to history_size=7 that amounts to
-  // 4M memory accesses.  The default value is 2 (128K memory accesses).
-  int history_size;
-  // Controls level of synchronization implied by IO operations.
-  // 0 - no synchronization
-  // 1 - reasonable level of synchronization (write->read)
-  // 2 - global synchronization of all IO operations
-  int io_sync;
-  // Die after multi-threaded fork if the child creates new threads.
-  bool die_after_fork;
+#define TSAN_FLAG(Type, Name, DefaultValue, Description) Type Name;
+#include "tsan_flags.inc"
+#undef TSAN_FLAG
+
+  void SetDefaults();
+  void ParseFromString(const char *str);
 };
 
 Flags *flags();
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_flags.inc b/contrib/compiler-rt/lib/tsan/rtl/tsan_flags.inc
new file mode 100644
index 000000000000..2925f38482a2
--- /dev/null
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_flags.inc
@@ -0,0 +1,78 @@
+//===-- tsan_flags.inc ------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// TSan runtime flags.
+//
+//===----------------------------------------------------------------------===//
+#ifndef TSAN_FLAG
+# error "Define TSAN_FLAG prior to including this file!"
+#endif
+
+// TSAN_FLAG(Type, Name, DefaultValue, Description)
+// See COMMON_FLAG in sanitizer_flags.inc for more details.
+
+TSAN_FLAG(bool, enable_annotations, true,
+          "Enable dynamic annotations, otherwise they are no-ops.")
+// Suppress a race report if we've already output another race report
+// with the same stack.
+TSAN_FLAG(bool, suppress_equal_stacks, true,
+          "Suppress a race report if we've already output another race report "
+          "with the same stack.")
+TSAN_FLAG(bool, suppress_equal_addresses, true,
+          "Suppress a race report if we've already output another race report "
+          "on the same address.")
+
+TSAN_FLAG(bool, report_bugs, true,
+          "Turns off bug reporting entirely (useful for benchmarking).")
+TSAN_FLAG(bool, report_thread_leaks, true, "Report thread leaks at exit?")
+TSAN_FLAG(bool, report_destroy_locked, true,
+          "Report destruction of a locked mutex?")
+TSAN_FLAG(bool, report_mutex_bugs, true,
+          "Report incorrect usages of mutexes and mutex annotations?")
+TSAN_FLAG(bool, report_signal_unsafe, true,
+          "Report violations of async signal-safety "
+          "(e.g. malloc() call from a signal handler).")
+TSAN_FLAG(bool, report_atomic_races, true,
+          "Report races between atomic and plain memory accesses.")
+TSAN_FLAG(
+    bool, force_seq_cst_atomics, false,
+    "If set, all atomics are effectively sequentially consistent (seq_cst), "
+    "regardless of what user actually specified.")
+TSAN_FLAG(bool, print_benign, false, "Print matched \"benign\" races at exit.")
+TSAN_FLAG(int, exitcode, 66, "Override exit status if something was reported.")
+TSAN_FLAG(bool, halt_on_error, false, "Exit after first reported error.")
+TSAN_FLAG(int, atexit_sleep_ms, 1000,
+          "Sleep in main thread before exiting for that many ms "
+          "(useful to catch \"at exit\" races).")
+TSAN_FLAG(const char *, profile_memory, "",
+          "If set, periodically write memory profile to that file.")
+TSAN_FLAG(int, flush_memory_ms, 0, "Flush shadow memory every X ms.")
+TSAN_FLAG(int, flush_symbolizer_ms, 5000, "Flush symbolizer caches every X ms.")
+TSAN_FLAG(
+    int, memory_limit_mb, 0,
+    "Resident memory limit in MB to aim at."
+    "If the process consumes more memory, then TSan will flush shadow memory.")
+TSAN_FLAG(bool, stop_on_start, false,
+          "Stops on start until __tsan_resume() is called (for debugging).")
+TSAN_FLAG(bool, running_on_valgrind, false,
+          "Controls whether RunningOnValgrind() returns true or false.")
+TSAN_FLAG(
+    int, history_size, kGoMode ? 1 : 2, // There are a lot of goroutines in Go.
+    "Per-thread history size, controls how many previous memory accesses "
+    "are remembered per thread.  Possible values are [0..7]. "
+    "history_size=0 amounts to 32K memory accesses.  Each next value doubles "
+    "the amount of memory accesses, up to history_size=7 that amounts to "
+    "4M memory accesses.  The default value is 2 (128K memory accesses).")
+TSAN_FLAG(int, io_sync, 1,
+          "Controls level of synchronization implied by IO operations. "
+          "0 - no synchronization "
+          "1 - reasonable level of synchronization (write->read)"
+          "2 - global synchronization of all IO operations.")
+TSAN_FLAG(bool, die_after_fork, true,
+          "Die after multi-threaded fork if the child creates new threads.")
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_interceptors.cc b/contrib/compiler-rt/lib/tsan/rtl/tsan_interceptors.cc
index 5bede0ec7d0c..9a6401167bc1 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_interceptors.cc
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_interceptors.cc
@@ -72,6 +72,7 @@ extern "C" void *__libc_malloc(uptr size);
 extern "C" void *__libc_calloc(uptr size, uptr n);
 extern "C" void *__libc_realloc(void *ptr, uptr size);
 extern "C" void __libc_free(void *ptr);
+extern "C" int dirfd(void *dirp);
 #if !SANITIZER_FREEBSD
 extern "C" int mallopt(int param, int value);
 #endif
@@ -101,14 +102,15 @@ typedef long long_t;  // NOLINT
 # define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
 # define F_TEST  3      /* Test a region for other processes locks.  */
 
-typedef void (*sighandler_t)(int sig);
-
 #define errno (*__errno_location())
 
+typedef void (*sighandler_t)(int sig);
+typedef void (*sigactionhandler_t)(int sig, my_siginfo_t *siginfo, void *uctx);
+
 struct sigaction_t {
   union {
     sighandler_t sa_handler;
-    void (*sa_sigaction)(int sig, my_siginfo_t *siginfo, void *uctx);
+    sigactionhandler_t sa_sigaction;
   };
 #if SANITIZER_FREEBSD
   int sa_flags;
@@ -505,14 +507,10 @@ TSAN_INTERCEPTOR(void*, __libc_memalign, uptr align, uptr sz) {
 TSAN_INTERCEPTOR(void*, calloc, uptr size, uptr n) {
   if (cur_thread()->in_symbolizer)
     return __libc_calloc(size, n);
-  if (__sanitizer::CallocShouldReturnNullDueToOverflow(size, n))
-    return AllocatorReturnNull();
   void *p = 0;
   {
     SCOPED_INTERCEPTOR_RAW(calloc, size, n);
-    p = user_alloc(thr, pc, n * size);
-    if (p)
-      internal_memset(p, 0, n * size);
+    p = user_calloc(thr, pc, size, n);
   }
   invoke_malloc_hook(p, n * size);
   return p;
@@ -952,6 +950,8 @@ TSAN_INTERCEPTOR(int, pthread_join, void *th, void **ret) {
   return res;
 }
 
+DEFINE_REAL_PTHREAD_FUNCTIONS
+
 TSAN_INTERCEPTOR(int, pthread_detach, void *th) {
   SCOPED_TSAN_INTERCEPTOR(pthread_detach, th);
   int tid = ThreadTid(thr, pc, (uptr)th);
@@ -1826,12 +1826,11 @@ TSAN_INTERCEPTOR(int, rmdir, char *path) {
   return res;
 }
 
-TSAN_INTERCEPTOR(void*, opendir, char *path) {
-  SCOPED_TSAN_INTERCEPTOR(opendir, path);
-  void *res = REAL(opendir)(path);
-  if (res != 0)
-    Acquire(thr, pc, Dir2addr(path));
-  return res;
+TSAN_INTERCEPTOR(int, closedir, void *dirp) {
+  SCOPED_TSAN_INTERCEPTOR(closedir, dirp);
+  int fd = dirfd(dirp);
+  FdClose(thr, pc, fd);
+  return REAL(closedir)(dirp);
 }
 
 #if !SANITIZER_FREEBSD
@@ -1875,15 +1874,18 @@ static void CallUserSignalHandler(ThreadState *thr, bool sync, bool acquire,
   // Ensure that the handler does not spoil errno.
   const int saved_errno = errno;
   errno = 99;
-  // Need to remember pc before the call, because the handler can reset it.
-  uptr pc = sigact ?
+  // This code races with sigaction. Be careful to not read sa_sigaction twice.
+  // Also need to remember pc for reporting before the call,
+  // because the handler can reset it.
+  volatile uptr pc = sigact ?
      (uptr)sigactions[sig].sa_sigaction :
      (uptr)sigactions[sig].sa_handler;
-  pc += 1;  // return address is expected, OutputReport() will undo this
-  if (sigact)
-    sigactions[sig].sa_sigaction(sig, info, uctx);
-  else
-    sigactions[sig].sa_handler(sig);
+  if (pc != (uptr)SIG_DFL && pc != (uptr)SIG_IGN) {
+    if (sigact)
+      ((sigactionhandler_t)pc)(sig, info, uctx);
+    else
+      ((sighandler_t)pc)(sig);
+  }
   // We do not detect errno spoiling for SIGTERM,
   // because some SIGTERM handlers do spoil errno but reraise SIGTERM,
   // tsan reports false positive in such case.
@@ -1893,7 +1895,9 @@ static void CallUserSignalHandler(ThreadState *thr, bool sync, bool acquire,
   // signal; and it looks too fragile to intercept all ways to reraise a signal.
   if (flags()->report_bugs && !sync && sig != SIGTERM && errno != 99) {
     VarSizeStackTrace stack;
-    ObtainCurrentStack(thr, pc, &stack);
+    // Add 1 to pc because return address is expected,
+    // OutputReport() will undo this.
+    ObtainCurrentStack(thr, pc + 1, &stack);
     ThreadRegistryLock l(ctx->thread_registry);
     ScopedReport rep(ReportTypeErrnoInSignal);
     if (!IsFiredSuppression(ctx, rep, stack)) {
@@ -1919,11 +1923,8 @@ void ProcessPendingSignals(ThreadState *thr) {
     SignalDesc *signal = &sctx->pending_signals[sig];
     if (signal->armed) {
       signal->armed = false;
-      if (sigactions[sig].sa_handler != SIG_DFL
-          && sigactions[sig].sa_handler != SIG_IGN) {
-        CallUserSignalHandler(thr, false, true, signal->sigaction,
-            sig, &signal->siginfo, &signal->ctx);
-      }
+      CallUserSignalHandler(thr, false, true, signal->sigaction, sig,
+          &signal->siginfo, &signal->ctx);
     }
   }
   pthread_sigmask(SIG_SETMASK, &oldset, 0);
@@ -2005,7 +2006,19 @@ TSAN_INTERCEPTOR(int, sigaction, int sig, sigaction_t *act, sigaction_t *old) {
     internal_memcpy(old, &sigactions[sig], sizeof(*old));
   if (act == 0)
     return 0;
-  internal_memcpy(&sigactions[sig], act, sizeof(*act));
+  // Copy act into sigactions[sig].
+  // Can't use struct copy, because compiler can emit call to memcpy.
+  // Can't use internal_memcpy, because it copies byte-by-byte,
+  // and signal handler reads the sa_handler concurrently. It it can read
+  // some bytes from old value and some bytes from new value.
+  // Use volatile to prevent insertion of memcpy.
+  sigactions[sig].sa_handler = *(volatile sighandler_t*)&act->sa_handler;
+  sigactions[sig].sa_flags = *(volatile int*)&act->sa_flags;
+  internal_memcpy(&sigactions[sig].sa_mask, &act->sa_mask,
+      sizeof(sigactions[sig].sa_mask));
+#if !SANITIZER_FREEBSD
+  sigactions[sig].sa_restorer = act->sa_restorer;
+#endif
   sigaction_t newact;
   internal_memcpy(&newact, act, sizeof(newact));
   REAL(sigfillset)(&newact.sa_mask);
@@ -2171,6 +2184,16 @@ static void HandleRecvmsg(ThreadState *thr, uptr pc,
 #undef SANITIZER_INTERCEPT_FGETPWENT
 #undef SANITIZER_INTERCEPT_GETPWNAM_AND_FRIENDS
 #undef SANITIZER_INTERCEPT_GETPWNAM_R_AND_FRIENDS
+// __tls_get_addr can be called with mis-aligned stack due to:
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
+// There are two potential issues:
+// 1. Sanitizer code contains a MOVDQA spill (it does not seem to be the case
+// right now). or 2. ProcessPendingSignal calls user handler which contains
+// MOVDQA spill (this happens right now).
+// Since the interceptor only initializes memory for msan, the simplest solution
+// is to disable the interceptor in tsan (other sanitizers do not call
+// signal handlers from COMMON_INTERCEPTOR_ENTER).
+#undef SANITIZER_INTERCEPT_TLS_GET_ADDR
 
 #define COMMON_INTERCEPT_FUNCTION(name) INTERCEPT_FUNCTION(name)
 
@@ -2209,12 +2232,15 @@ static void HandleRecvmsg(ThreadState *thr, uptr pc,
     if (fd >= 0) FdClose(thr, pc, fd);           \
   }
 
-#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, res)  \
+#define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle) \
   libignore()->OnLibraryLoaded(filename)
 
 #define COMMON_INTERCEPTOR_LIBRARY_UNLOADED() \
   libignore()->OnLibraryUnloaded()
 
+#define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path) \
+  Acquire(((TsanInterceptorContext *) ctx)->thr, pc, Dir2addr(path))
+
 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd) \
   FdAcquire(((TsanInterceptorContext *) ctx)->thr, pc, fd)
 
@@ -2530,7 +2556,7 @@ void InitializeInterceptors() {
   TSAN_INTERCEPT(abort);
   TSAN_INTERCEPT(puts);
   TSAN_INTERCEPT(rmdir);
-  TSAN_INTERCEPT(opendir);
+  TSAN_INTERCEPT(closedir);
 
   TSAN_MAYBE_INTERCEPT_EPOLL_CTL;
   TSAN_MAYBE_INTERCEPT_EPOLL_WAIT;
@@ -2569,19 +2595,4 @@ void InitializeInterceptors() {
   FdInit();
 }
 
-void *internal_start_thread(void(*func)(void *arg), void *arg) {
-  // Start the thread with signals blocked, otherwise it can steal user signals.
-  __sanitizer_sigset_t set, old;
-  internal_sigfillset(&set);
-  internal_sigprocmask(SIG_SETMASK, &set, &old);
-  void *th;
-  REAL(pthread_create)(&th, 0, (void*(*)(void *arg))func, arg);
-  internal_sigprocmask(SIG_SETMASK, &old, 0);
-  return th;
-}
-
-void internal_join_thread(void *th) {
-  REAL(pthread_join)(th, 0);
-}
-
 }  // namespace __tsan
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_interface.cc b/contrib/compiler-rt/lib/tsan/rtl/tsan_interface.cc
index 9de3808e79ff..9bc9a696363d 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_interface.cc
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_interface.cc
@@ -38,56 +38,79 @@ void __tsan_write16(void *addr) {
   MemoryWrite(cur_thread(), CALLERPC, (uptr)addr + 8, kSizeLog8);
 }
 
-u16 __tsan_unaligned_read2(const uu16 *addr) {
+// __tsan_unaligned_read/write calls are emitted by compiler.
+
+void __tsan_unaligned_read2(const void *addr) {
   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 2, false, false);
-  return *addr;
 }
 
-u32 __tsan_unaligned_read4(const uu32 *addr) {
+void __tsan_unaligned_read4(const void *addr) {
   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 4, false, false);
-  return *addr;
 }
 
-u64 __tsan_unaligned_read8(const uu64 *addr) {
+void __tsan_unaligned_read8(const void *addr) {
   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 8, false, false);
-  return *addr;
 }
 
-void __tsan_unaligned_write2(uu16 *addr, u16 v) {
+void __tsan_unaligned_read16(const void *addr) {
+  UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 16, false, false);
+}
+
+void __tsan_unaligned_write2(void *addr) {
   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 2, true, false);
-  *addr = v;
 }
 
-void __tsan_unaligned_write4(uu32 *addr, u32 v) {
+void __tsan_unaligned_write4(void *addr) {
   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 4, true, false);
-  *addr = v;
 }
 
-void __tsan_unaligned_write8(uu64 *addr, u64 v) {
+void __tsan_unaligned_write8(void *addr) {
   UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 8, true, false);
-  *addr = v;
 }
 
+void __tsan_unaligned_write16(void *addr) {
+  UnalignedMemoryAccess(cur_thread(), CALLERPC, (uptr)addr, 16, true, false);
+}
+
+// __sanitizer_unaligned_load/store are for user instrumentation.
+
 extern "C" {
 SANITIZER_INTERFACE_ATTRIBUTE
-uint16_t __sanitizer_unaligned_load16(void *addr)
-    ALIAS("__tsan_unaligned_read2");
+u16 __sanitizer_unaligned_load16(const uu16 *addr) {
+  __tsan_unaligned_read2(addr);
+  return *addr;
+}
+
 SANITIZER_INTERFACE_ATTRIBUTE
-uint32_t __sanitizer_unaligned_load32(void *addr)
-    ALIAS("__tsan_unaligned_read4");
+u32 __sanitizer_unaligned_load32(const uu32 *addr) {
+  __tsan_unaligned_read4(addr);
+  return *addr;
+}
+
 SANITIZER_INTERFACE_ATTRIBUTE
-uint64_t __sanitizer_unaligned_load64(void *addr)
-    ALIAS("__tsan_unaligned_read8");
+u64 __sanitizer_unaligned_load64(const uu64 *addr) {
+  __tsan_unaligned_read8(addr);
+  return *addr;
+}
+
 SANITIZER_INTERFACE_ATTRIBUTE
-void __sanitizer_unaligned_store16(void *addr, uint16_t v)
-    ALIAS("__tsan_unaligned_write2");
+void __sanitizer_unaligned_store16(uu16 *addr, u16 v) {
+  __tsan_unaligned_write2(addr);
+  *addr = v;
+}
+
 SANITIZER_INTERFACE_ATTRIBUTE
-void __sanitizer_unaligned_store32(void *addr, uint32_t v)
-    ALIAS("__tsan_unaligned_write4");
+void __sanitizer_unaligned_store32(uu32 *addr, u32 v) {
+  __tsan_unaligned_write4(addr);
+  *addr = v;
+}
+
 SANITIZER_INTERFACE_ATTRIBUTE
-void __sanitizer_unaligned_store64(void *addr, uint64_t v)
-    ALIAS("__tsan_unaligned_write8");
+void __sanitizer_unaligned_store64(uu64 *addr, u64 v) {
+  __tsan_unaligned_write8(addr);
+  *addr = v;
 }
+}  // extern "C"
 
 void __tsan_acquire(void *addr) {
   Acquire(cur_thread(), CALLERPC, (uptr)addr);
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_interface.h b/contrib/compiler-rt/lib/tsan/rtl/tsan_interface.h
index 70450697d480..a05e6f0f6d09 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_interface.h
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_interface.h
@@ -41,12 +41,15 @@ SANITIZER_INTERFACE_ATTRIBUTE void __tsan_write4(void *addr);
 SANITIZER_INTERFACE_ATTRIBUTE void __tsan_write8(void *addr);
 SANITIZER_INTERFACE_ATTRIBUTE void __tsan_write16(void *addr);
 
-SANITIZER_INTERFACE_ATTRIBUTE u16 __tsan_unaligned_read2(const uu16 *addr);
-SANITIZER_INTERFACE_ATTRIBUTE u32 __tsan_unaligned_read4(const uu32 *addr);
-SANITIZER_INTERFACE_ATTRIBUTE u64 __tsan_unaligned_read8(const uu64 *addr);
-SANITIZER_INTERFACE_ATTRIBUTE void __tsan_unaligned_write2(uu16 *addr, u16 v);
-SANITIZER_INTERFACE_ATTRIBUTE void __tsan_unaligned_write4(uu32 *addr, u32 v);
-SANITIZER_INTERFACE_ATTRIBUTE void __tsan_unaligned_write8(uu64 *addr, u64 v);
+SANITIZER_INTERFACE_ATTRIBUTE void __tsan_unaligned_read2(const void *addr);
+SANITIZER_INTERFACE_ATTRIBUTE void __tsan_unaligned_read4(const void *addr);
+SANITIZER_INTERFACE_ATTRIBUTE void __tsan_unaligned_read8(const void *addr);
+SANITIZER_INTERFACE_ATTRIBUTE void __tsan_unaligned_read16(const void *addr);
+
+SANITIZER_INTERFACE_ATTRIBUTE void __tsan_unaligned_write2(void *addr);
+SANITIZER_INTERFACE_ATTRIBUTE void __tsan_unaligned_write4(void *addr);
+SANITIZER_INTERFACE_ATTRIBUTE void __tsan_unaligned_write8(void *addr);
+SANITIZER_INTERFACE_ATTRIBUTE void __tsan_unaligned_write16(void *addr);
 
 SANITIZER_INTERFACE_ATTRIBUTE void __tsan_vptr_read(void **vptr_p);
 SANITIZER_INTERFACE_ATTRIBUTE
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_interface_java.cc b/contrib/compiler-rt/lib/tsan/rtl/tsan_interface_java.cc
index 8615349f657f..0aea63d11671 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_interface_java.cc
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_interface_java.cc
@@ -219,3 +219,33 @@ int __tsan_java_mutex_unlock_rec(jptr addr) {
 
   return MutexUnlock(thr, pc, addr, true);
 }
+
+void __tsan_java_acquire(jptr addr) {
+  SCOPED_JAVA_FUNC(__tsan_java_acquire);
+  DPrintf("#%d: java_acquire(%p)\n", thr->tid, addr);
+  CHECK_NE(jctx, 0);
+  CHECK_GE(addr, jctx->heap_begin);
+  CHECK_LT(addr, jctx->heap_begin + jctx->heap_size);
+
+  Acquire(thr, caller_pc, addr);
+}
+
+void __tsan_java_release(jptr addr) {
+  SCOPED_JAVA_FUNC(__tsan_java_release);
+  DPrintf("#%d: java_release(%p)\n", thr->tid, addr);
+  CHECK_NE(jctx, 0);
+  CHECK_GE(addr, jctx->heap_begin);
+  CHECK_LT(addr, jctx->heap_begin + jctx->heap_size);
+
+  Release(thr, caller_pc, addr);
+}
+
+void __tsan_java_release_store(jptr addr) {
+  SCOPED_JAVA_FUNC(__tsan_java_release);
+  DPrintf("#%d: java_release_store(%p)\n", thr->tid, addr);
+  CHECK_NE(jctx, 0);
+  CHECK_GE(addr, jctx->heap_begin);
+  CHECK_LT(addr, jctx->heap_begin + jctx->heap_size);
+
+  ReleaseStore(thr, caller_pc, addr);
+}
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_interface_java.h b/contrib/compiler-rt/lib/tsan/rtl/tsan_interface_java.h
index 1f793df712de..30153a1d8505 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_interface_java.h
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_interface_java.h
@@ -79,6 +79,14 @@ void __tsan_java_mutex_lock_rec(jptr addr, int rec) INTERFACE_ATTRIBUTE;
 // the same recursion level.
 int __tsan_java_mutex_unlock_rec(jptr addr) INTERFACE_ATTRIBUTE;
 
+// Raw acquire/release primitives.
+// Can be used to establish happens-before edges on volatile/final fields,
+// in atomic operations, etc. release_store is the same as release, but it
+// breaks release sequence on addr (see C++ standard 1.10/7 for details).
+void __tsan_java_acquire(jptr addr) INTERFACE_ATTRIBUTE;
+void __tsan_java_release(jptr addr) INTERFACE_ATTRIBUTE;
+void __tsan_java_release_store(jptr addr) INTERFACE_ATTRIBUTE;
+
 #ifdef __cplusplus
 }  // extern "C"
 #endif
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_mman.cc b/contrib/compiler-rt/lib/tsan/rtl/tsan_mman.cc
index 285bdb34d91d..ebb3f77fb992 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_mman.cc
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_mman.cc
@@ -45,7 +45,7 @@ Allocator *allocator() {
 }
 
 void InitializeAllocator() {
-  allocator()->Init();
+  allocator()->Init(common_flags()->allocator_may_return_null);
 }
 
 void AllocatorThreadStart(ThreadState *thr) {
@@ -78,7 +78,7 @@ static void SignalUnsafeCall(ThreadState *thr, uptr pc) {
 
 void *user_alloc(ThreadState *thr, uptr pc, uptr sz, uptr align, bool signal) {
   if ((sz >= (1ull << 40)) || (align >= (1ull << 40)))
-    return AllocatorReturnNull();
+    return allocator()->ReturnNullOrDie();
   void *p = allocator()->Allocate(&thr->alloc_cache, sz, align);
   if (p == 0)
     return 0;
@@ -89,6 +89,15 @@ void *user_alloc(ThreadState *thr, uptr pc, uptr sz, uptr align, bool signal) {
   return p;
 }
 
+void *user_calloc(ThreadState *thr, uptr pc, uptr size, uptr n) {
+  if (CallocShouldReturnNullDueToOverflow(size, n))
+    return allocator()->ReturnNullOrDie();
+  void *p = user_alloc(thr, pc, n * size);
+  if (p)
+    internal_memset(p, 0, n * size);
+  return p;
+}
+
 void user_free(ThreadState *thr, uptr pc, void *p, bool signal) {
   if (ctx && ctx->initialized)
     OnUserFree(thr, pc, (uptr)p, true);
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_mman.h b/contrib/compiler-rt/lib/tsan/rtl/tsan_mman.h
index 7d41fa864a26..5ff956d827f6 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_mman.h
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_mman.h
@@ -27,6 +27,7 @@ void AllocatorPrintStats();
 // For user allocations.
 void *user_alloc(ThreadState *thr, uptr pc, uptr sz,
                  uptr align = kDefaultAlignment, bool signal = true);
+void *user_calloc(ThreadState *thr, uptr pc, uptr sz, uptr n);
 // Does not accept NULL.
 void user_free(ThreadState *thr, uptr pc, void *p, bool signal = true);
 void *user_realloc(ThreadState *thr, uptr pc, void *p, uptr sz);
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_mutex.cc b/contrib/compiler-rt/lib/tsan/rtl/tsan_mutex.cc
index 9ea9bae21b50..dc5a462a8081 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_mutex.cc
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_mutex.cc
@@ -25,7 +25,7 @@ namespace __tsan {
 // then Report mutex can be locked while under Threads mutex.
 // The leaf mutexes can be locked under any other mutexes.
 // Recursive locking is not supported.
-#if TSAN_DEBUG && !SANITIZER_GO
+#if SANITIZER_DEBUG && !SANITIZER_GO
 const MutexType MutexTypeLeaf = (MutexType)-1;
 static MutexType CanLockTab[MutexTypeCount][MutexTypeCount] = {
   /*0  MutexTypeInvalid*/     {},
@@ -47,7 +47,7 @@ static bool CanLockAdj[MutexTypeCount][MutexTypeCount];
 #endif
 
 void InitializeMutex() {
-#if TSAN_DEBUG && !SANITIZER_GO
+#if SANITIZER_DEBUG && !SANITIZER_GO
   // Build the "can lock" adjacency matrix.
   // If [i][j]==true, then one can lock mutex j while under mutex i.
   const int N = MutexTypeCount;
@@ -128,7 +128,7 @@ InternalDeadlockDetector::InternalDeadlockDetector() {
   // Rely on zero initialization because some mutexes can be locked before ctor.
 }
 
-#if TSAN_DEBUG && !SANITIZER_GO
+#if SANITIZER_DEBUG && !SANITIZER_GO
 void InternalDeadlockDetector::Lock(MutexType t) {
   // Printf("LOCK %d @%zu\n", t, seq_ + 1);
   CHECK_GT(t, MutexTypeInvalid);
@@ -170,7 +170,7 @@ void InternalDeadlockDetector::CheckNoLocks() {
 #endif
 
 void CheckNoLocks(ThreadState *thr) {
-#if TSAN_DEBUG && !SANITIZER_GO
+#if SANITIZER_DEBUG && !SANITIZER_GO
   thr->internal_deadlock_detector.CheckNoLocks();
 #endif
 }
@@ -208,7 +208,7 @@ class Backoff {
 Mutex::Mutex(MutexType type, StatType stat_type) {
   CHECK_GT(type, MutexTypeInvalid);
   CHECK_LT(type, MutexTypeCount);
-#if TSAN_DEBUG
+#if SANITIZER_DEBUG
   type_ = type;
 #endif
 #if TSAN_COLLECT_STATS
@@ -222,7 +222,7 @@ Mutex::~Mutex() {
 }
 
 void Mutex::Lock() {
-#if TSAN_DEBUG && !SANITIZER_GO
+#if SANITIZER_DEBUG && !SANITIZER_GO
   cur_thread()->internal_deadlock_detector.Lock(type_);
 #endif
   uptr cmp = kUnlocked;
@@ -247,13 +247,13 @@ void Mutex::Unlock() {
   uptr prev = atomic_fetch_sub(&state_, kWriteLock, memory_order_release);
   (void)prev;
   DCHECK_NE(prev & kWriteLock, 0);
-#if TSAN_DEBUG && !SANITIZER_GO
+#if SANITIZER_DEBUG && !SANITIZER_GO
   cur_thread()->internal_deadlock_detector.Unlock(type_);
 #endif
 }
 
 void Mutex::ReadLock() {
-#if TSAN_DEBUG && !SANITIZER_GO
+#if SANITIZER_DEBUG && !SANITIZER_GO
   cur_thread()->internal_deadlock_detector.Lock(type_);
 #endif
   uptr prev = atomic_fetch_add(&state_, kReadLock, memory_order_acquire);
@@ -275,7 +275,7 @@ void Mutex::ReadUnlock() {
   (void)prev;
   DCHECK_EQ(prev & kWriteLock, 0);
   DCHECK_GT(prev & ~kWriteLock, 0);
-#if TSAN_DEBUG && !SANITIZER_GO
+#if SANITIZER_DEBUG && !SANITIZER_GO
   cur_thread()->internal_deadlock_detector.Unlock(type_);
 #endif
 }
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_mutex.h b/contrib/compiler-rt/lib/tsan/rtl/tsan_mutex.h
index 7bb1c48fcac8..88fad57c78a0 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_mutex.h
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_mutex.h
@@ -52,7 +52,7 @@ class Mutex {
 
  private:
   atomic_uintptr_t state_;
-#if TSAN_DEBUG
+#if SANITIZER_DEBUG
   MutexType type_;
 #endif
 #if TSAN_COLLECT_STATS
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_platform.h b/contrib/compiler-rt/lib/tsan/rtl/tsan_platform.h
index 270a7519dd0a..03f95694d26c 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_platform.h
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_platform.h
@@ -252,9 +252,6 @@ void InitializePlatform();
 void FlushShadowMemory();
 void WriteMemoryProfile(char *buf, uptr buf_size, uptr nthread, uptr nlive);
 
-void *internal_start_thread(void(*func)(void*), void *arg);
-void internal_join_thread(void *th);
-
 // Says whether the addr relates to a global var.
 // Guesses with high probability, may yield both false positives and negatives.
 bool IsGlobalVar(uptr addr);
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cc b/contrib/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cc
index 4dcfa558529c..7bc28db296ec 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cc
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cc
@@ -215,10 +215,11 @@ void InitializeShadowMemory() {
   // Frequently a thread uses only a small part of stack and similarly
   // a program uses a small part of large mmap. On some programs
   // we see 20% memory usage reduction without huge pages for this range.
-#ifdef MADV_NOHUGEPAGE
-  madvise((void*)MemToShadow(0x7f0000000000ULL),
-      0x10000000000ULL * kShadowMultiplier, MADV_NOHUGEPAGE);
-#endif
+  // FIXME: don't use constants here.
+  NoHugePagesInRegion(MemToShadow(0x7f0000000000ULL),
+                      0x10000000000ULL * kShadowMultiplier);
+  if (common_flags()->use_madv_dontdump)
+    DontDumpShadowMemory(kShadowBeg, kShadowEnd - kShadowBeg);
   DPrintf("memory shadow: %zx-%zx (%zuGB)\n",
       kShadowBeg, kShadowEnd,
       (kShadowEnd - kShadowBeg) >> 30);
@@ -232,6 +233,8 @@ void InitializeShadowMemory() {
                "to link with -pie (%p, %p).\n", meta, kMetaShadowBeg);
     Die();
   }
+  if (common_flags()->use_madv_dontdump)
+    DontDumpShadowMemory(meta, meta_size);
   DPrintf("meta shadow: %zx-%zx (%zuGB)\n",
       meta, meta + meta_size, meta_size >> 30);
 
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_platform_mac.cc b/contrib/compiler-rt/lib/tsan/rtl/tsan_platform_mac.cc
index 15b9f9d2cb19..63f1748e13ce 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_platform_mac.cc
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_platform_mac.cc
@@ -60,6 +60,8 @@ void InitializeShadowMemory() {
            "to link with -pie.\n");
     Die();
   }
+  if (common_flags()->use_madv_dontdump)
+    DontDumpShadowMemory(kShadowBeg, kShadowEnd - kShadowBeg);
   DPrintf("kShadow %zx-%zx (%zuGB)\n",
       kShadowBeg, kShadowEnd,
       (kShadowEnd - kShadowBeg) >> 30);
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl.cc b/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl.cc
index 7cb7008e2980..b3320aad8038 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl.cc
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl.cc
@@ -365,8 +365,7 @@ int Finalize(ThreadState *thr) {
   ctx->report_mtx.Unlock();
 
 #ifndef SANITIZER_GO
-  if (common_flags()->verbosity)
-    AllocatorPrintStats();
+  if (Verbosity()) AllocatorPrintStats();
 #endif
 
   ThreadFinalize(thr);
@@ -565,43 +564,26 @@ void MemoryAccessImpl1(ThreadState *thr, uptr addr,
   // it's just not worth it (performance- and complexity-wise).
 
   Shadow old(0);
-  if (kShadowCnt == 1) {
-    int idx = 0;
-#include "tsan_update_shadow_word_inl.h"
-  } else if (kShadowCnt == 2) {
-    int idx = 0;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 1;
-#include "tsan_update_shadow_word_inl.h"
-  } else if (kShadowCnt == 4) {
-    int idx = 0;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 1;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 2;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 3;
-#include "tsan_update_shadow_word_inl.h"
-  } else if (kShadowCnt == 8) {
-    int idx = 0;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 1;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 2;
-#include "tsan_update_shadow_word_inl.h"
-    idx = 3;
+
+  // It release mode we manually unroll the loop,
+  // because empirically gcc generates better code this way.
+  // However, we can't afford unrolling in debug mode, because the function
+  // consumes almost 4K of stack. Gtest gives only 4K of stack to death test
+  // threads, which is not enough for the unrolled loop.
+#if SANITIZER_DEBUG
+  for (int idx = 0; idx < 4; idx++) {
 #include "tsan_update_shadow_word_inl.h"
-    idx = 4;
+  }
+#else
+  int idx = 0;
 #include "tsan_update_shadow_word_inl.h"
-    idx = 5;
+  idx = 1;
 #include "tsan_update_shadow_word_inl.h"
-    idx = 6;
+  idx = 2;
 #include "tsan_update_shadow_word_inl.h"
-    idx = 7;
+  idx = 3;
 #include "tsan_update_shadow_word_inl.h"
-  } else {
-    CHECK(false);
-  }
+#endif
 
   // we did not find any races and had already stored
   // the current access info, so we are done
@@ -652,7 +634,7 @@ bool ContainsSameAccessSlow(u64 *s, u64 a, u64 sync_epoch, bool is_write) {
   return false;
 }
 
-#if defined(__SSE3__) && TSAN_SHADOW_COUNT == 4
+#if defined(__SSE3__)
 #define SHUF(v0, v1, i0, i1, i2, i3) _mm_castps_si128(_mm_shuffle_ps( \
     _mm_castsi128_ps(v0), _mm_castsi128_ps(v1), \
     (i0)*1 + (i1)*4 + (i2)*16 + (i3)*64))
@@ -712,11 +694,12 @@ bool ContainsSameAccessFast(u64 *s, u64 a, u64 sync_epoch, bool is_write) {
 
 ALWAYS_INLINE
 bool ContainsSameAccess(u64 *s, u64 a, u64 sync_epoch, bool is_write) {
-#if defined(__SSE3__) && TSAN_SHADOW_COUNT == 4
+#if defined(__SSE3__)
   bool res = ContainsSameAccessFast(s, a, sync_epoch, is_write);
   // NOTE: this check can fail if the shadow is concurrently mutated
-  // by other threads.
-  DCHECK_EQ(res, ContainsSameAccessSlow(s, a, sync_epoch, is_write));
+  // by other threads. But it still can be useful if you modify
+  // ContainsSameAccessFast and want to ensure that it's not completely broken.
+  // DCHECK_EQ(res, ContainsSameAccessSlow(s, a, sync_epoch, is_write));
   return res;
 #else
   return ContainsSameAccessSlow(s, a, sync_epoch, is_write);
@@ -733,7 +716,7 @@ void MemoryAccess(ThreadState *thr, uptr pc, uptr addr,
       (int)(1 << kAccessSizeLog), kAccessIsWrite, shadow_mem,
       (uptr)shadow_mem[0], (uptr)shadow_mem[1],
       (uptr)shadow_mem[2], (uptr)shadow_mem[3]);
-#if TSAN_DEBUG
+#if SANITIZER_DEBUG
   if (!IsAppMem(addr)) {
     Printf("Access to non app mem %zx\n", addr);
     DCHECK(IsAppMem(addr));
@@ -990,7 +973,7 @@ bool MD5Hash::operator==(const MD5Hash &other) const {
   return hash[0] == other.hash[0] && hash[1] == other.hash[1];
 }
 
-#if TSAN_DEBUG
+#if SANITIZER_DEBUG
 void build_consistency_debug() {}
 #else
 void build_consistency_release() {}
@@ -1002,16 +985,6 @@ void build_consistency_stats() {}
 void build_consistency_nostats() {}
 #endif
 
-#if TSAN_SHADOW_COUNT == 1
-void build_consistency_shadow1() {}
-#elif TSAN_SHADOW_COUNT == 2
-void build_consistency_shadow2() {}
-#elif TSAN_SHADOW_COUNT == 4
-void build_consistency_shadow4() {}
-#else
-void build_consistency_shadow8() {}
-#endif
-
 }  // namespace __tsan
 
 #ifndef SANITIZER_GO
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl.h b/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl.h
index 8d886875159b..768e8307fcc8 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl.h
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl.h
@@ -685,7 +685,7 @@ void AcquireReleaseImpl(ThreadState *thr, uptr pc, SyncClock *c);
 // The trick is that the call preserves all registers and the compiler
 // does not treat it as a call.
 // If it does not work for you, use normal call.
-#if TSAN_DEBUG == 0
+#if !SANITIZER_DEBUG && defined(__x86_64__)
 // The caller may not create the stack frame for itself at all,
 // so we create a reserve stack frame for it (1024b must be enough).
 #define HACKY_CALL(f) \
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl_report.cc b/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl_report.cc
index 0481b23b7be0..d1621454242c 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl_report.cc
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl_report.cc
@@ -87,7 +87,7 @@ static void StackStripMain(SymbolizedStack *frames) {
     // can actually happen if we do not instrument some code,
     // so it's only a debug print. However we must try hard to not miss it
     // due to our fault.
-    DPrintf("Bottom stack frame of stack %zx is missed\n", stack->info.address);
+    DPrintf("Bottom stack frame is missed\n");
   }
 #else
   // The last frame always point into runtime (gosched0, goexit0, runtime.main).
@@ -251,7 +251,8 @@ ThreadContext *IsThreadStackOrTls(uptr addr, bool *is_stack) {
 
 void ScopedReport::AddThread(int unique_tid, bool suppressable) {
 #ifndef SANITIZER_GO
-  AddThread(FindThreadByUidLocked(unique_tid), suppressable);
+  if (const ThreadContext *tctx = FindThreadByUidLocked(unique_tid))
+    AddThread(tctx, suppressable);
 #endif
 }
 
@@ -397,7 +398,7 @@ void RestoreStack(int tid, const u64 epoch, VarSizeStackTrace *stk,
   InternalScopedBuffer<uptr> stack(kShadowStackSize);
   for (uptr i = 0; i < hdr->stack0.size; i++) {
     stack[i] = hdr->stack0.trace[i];
-    DPrintf2("  #%02lu: pc=%zx\n", i, stack[i]);
+    DPrintf2("  #%02zu: pc=%zx\n", i, stack[i]);
   }
   if (mset)
     *mset = hdr->mset0;
diff --git a/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cc b/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cc
index 7b7b27c024f6..e026217ed171 100644
--- a/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cc
+++ b/contrib/compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cc
@@ -111,12 +111,13 @@ void ThreadContext::OnStarted(void *arg) {
     thr->dd_pt = ctx->dd->CreatePhysicalThread();
     thr->dd_lt = ctx->dd->CreateLogicalThread(unique_id);
   }
+  thr->fast_state.SetHistorySize(flags()->history_size);
+  // Commit switch to the new part of the trace.
+  // TraceAddEvent will reset stack0/mset0 in the new part for us.
+  TraceAddEvent(thr, thr->fast_state, EventTypeMop, 0);
+
   thr->fast_synch_epoch = epoch0;
   AcquireImpl(thr, 0, &sync);
-  thr->fast_state.SetHistorySize(flags()->history_size);
-  const uptr trace = (epoch0 / kTracePartSize) % TraceParts();
-  Trace *thr_trace = ThreadTrace(thr->tid);
-  thr_trace->headers[trace].epoch0 = epoch0;
   StatInc(thr, StatSyncAcquire);
   sync.Reset(&thr->clock_cache);
   DPrintf("#%d: ThreadStart epoch=%zu stk_addr=%zx stk_size=%zx "
@@ -329,7 +330,7 @@ void MemoryAccessRange(ThreadState *thr, uptr pc, uptr addr,
       thr->tid, (void*)pc, (void*)addr,
       (int)size, is_write);
 
-#if TSAN_DEBUG
+#if SANITIZER_DEBUG
   if (!IsAppMem(addr)) {
     Printf("Access to non app mem %zx\n", addr);
     DCHECK(IsAppMem(addr));
diff --git a/contrib/compiler-rt/lib/tsan/tests/rtl/tsan_string.cc b/contrib/compiler-rt/lib/tsan/tests/rtl/tsan_string.cc
index c402f7cbd679..75adc6c85ee9 100644
--- a/contrib/compiler-rt/lib/tsan/tests/rtl/tsan_string.cc
+++ b/contrib/compiler-rt/lib/tsan/tests/rtl/tsan_string.cc
@@ -46,9 +46,6 @@ TEST(ThreadSanitizer, MemcpyRace1) {
   t2.Memcpy(data, data2, 10, true);
 }
 
-// The test fails with TSAN_SHADOW_COUNT=2,
-// because the old racy access is evicted.
-#if defined(TSAN_SHADOW_COUNT) && TSAN_SHADOW_COUNT >= 4
 TEST(ThreadSanitizer, MemcpyRace2) {
   char *data = new char[10];
   char *data1 = new char[10];
@@ -57,7 +54,6 @@ TEST(ThreadSanitizer, MemcpyRace2) {
   t1.Memcpy(data+5, data1, 1);
   t2.Memcpy(data+3, data2, 4, true);
 }
-#endif
 
 TEST(ThreadSanitizer, MemcpyRace3) {
   char *data = new char[10];
diff --git a/contrib/compiler-rt/lib/tsan/tests/unit/tsan_clock_test.cc b/contrib/compiler-rt/lib/tsan/tests/unit/tsan_clock_test.cc
index a1fd2b7f6e99..92071827d3d8 100644
--- a/contrib/compiler-rt/lib/tsan/tests/unit/tsan_clock_test.cc
+++ b/contrib/compiler-rt/lib/tsan/tests/unit/tsan_clock_test.cc
@@ -211,8 +211,8 @@ TEST(Clock, Growth) {
   }
 }
 
-const int kThreads = 4;
-const int kClocks = 4;
+const uptr kThreads = 4;
+const uptr kClocks = 4;
 
 // SimpleSyncClock and SimpleThreadClock implement the same thing as
 // SyncClock and ThreadClock, but in a very simple way.
diff --git a/contrib/compiler-rt/lib/tsan/tests/unit/tsan_mman_test.cc b/contrib/compiler-rt/lib/tsan/tests/unit/tsan_mman_test.cc
index d969989df768..bfaefe648705 100644
--- a/contrib/compiler-rt/lib/tsan/tests/unit/tsan_mman_test.cc
+++ b/contrib/compiler-rt/lib/tsan/tests/unit/tsan_mman_test.cc
@@ -136,7 +136,7 @@ TEST(Mman, Stats) {
 }
 
 TEST(Mman, CallocOverflow) {
-#if TSAN_DEBUG
+#if SANITIZER_DEBUG
   // EXPECT_DEATH clones a thread with 4K stack,
   // which is overflown by tsan memory accesses functions in debug mode.
   return;
diff --git a/contrib/compiler-rt/lib/tsan/tests/unit/tsan_mutex_test.cc b/contrib/compiler-rt/lib/tsan/tests/unit/tsan_mutex_test.cc
index c39841ddcbb1..cce7f073b92f 100644
--- a/contrib/compiler-rt/lib/tsan/tests/unit/tsan_mutex_test.cc
+++ b/contrib/compiler-rt/lib/tsan/tests/unit/tsan_mutex_test.cc
@@ -64,7 +64,7 @@ class TestData {
 
 const int kThreads = 8;
 const int kWriteRate = 1024;
-#if TSAN_DEBUG
+#if SANITIZER_DEBUG
 const int kIters = 16*1024;
 #else
 const int kIters = 64*1024;
diff --git a/contrib/compiler-rt/lib/ubsan/ubsan_flags.cc b/contrib/compiler-rt/lib/ubsan/ubsan_flags.cc
index eda11f1b265c..0dbffc9b102a 100644
--- a/contrib/compiler-rt/lib/ubsan/ubsan_flags.cc
+++ b/contrib/compiler-rt/lib/ubsan/ubsan_flags.cc
@@ -14,6 +14,7 @@
 #include "ubsan_flags.h"
 #include "sanitizer_common/sanitizer_common.h"
 #include "sanitizer_common/sanitizer_flags.h"
+#include "sanitizer_common/sanitizer_flag_parser.h"
 
 namespace __ubsan {
 
@@ -21,36 +22,51 @@ static const char *MaybeCallUbsanDefaultOptions() {
   return (&__ubsan_default_options) ? __ubsan_default_options() : "";
 }
 
-void InitializeCommonFlags() {
-  CommonFlags *cf = common_flags();
-  SetCommonFlagsDefaults(cf);
-  cf->print_summary = false;
-  // Override from user-specified string.
-  ParseCommonFlagsFromString(cf, MaybeCallUbsanDefaultOptions());
-  // Override from environment variable.
-  ParseCommonFlagsFromString(cf, GetEnv("UBSAN_OPTIONS"));
-}
-
 Flags ubsan_flags;
 
-static void ParseFlagsFromString(Flags *f, const char *str) {
-  if (!str)
-    return;
-  ParseFlag(str, &f->halt_on_error, "halt_on_error",
-            "Crash the program after printing the first error report");
-  ParseFlag(str, &f->print_stacktrace, "print_stacktrace",
-            "Include full stacktrace into an error report");
+void Flags::SetDefaults() {
+#define UBSAN_FLAG(Type, Name, DefaultValue, Description) Name = DefaultValue;
+#include "ubsan_flags.inc"
+#undef UBSAN_FLAG
 }
 
-void InitializeFlags() {
+void RegisterUbsanFlags(FlagParser *parser, Flags *f) {
+#define UBSAN_FLAG(Type, Name, DefaultValue, Description) \
+  RegisterFlag(parser, #Name, Description, &f->Name);
+#include "ubsan_flags.inc"
+#undef UBSAN_FLAG
+}
+
+void InitializeFlags(bool standalone) {
   Flags *f = flags();
-  // Default values.
-  f->halt_on_error = false;
-  f->print_stacktrace = false;
+  FlagParser parser;
+  RegisterUbsanFlags(&parser, f);
+
+  if (standalone) {
+    RegisterCommonFlags(&parser);
+
+    SetCommonFlagsDefaults();
+    CommonFlags cf;
+    cf.CopyFrom(*common_flags());
+    cf.print_summary = false;
+    OverrideCommonFlags(cf);
+  } else {
+    // Ignore common flags if not standalone.
+    // This is inconsistent with LSan, which allows common flags in LSAN_FLAGS.
+    // This is caused by undefined initialization order between ASan and UBsan,
+    // which makes it impossible to make sure that common flags from ASAN_OPTIONS
+    // have not been used (in __asan_init) before they are overwritten with flags
+    // from UBSAN_OPTIONS.
+    CommonFlags cf_ignored;
+    RegisterCommonFlags(&parser, &cf_ignored);
+  }
+
+  f->SetDefaults();
   // Override from user-specified string.
-  ParseFlagsFromString(f, MaybeCallUbsanDefaultOptions());
+  parser.ParseString(MaybeCallUbsanDefaultOptions());
   // Override from environment variable.
-  ParseFlagsFromString(f, GetEnv("UBSAN_OPTIONS"));
+  parser.ParseString(GetEnv("UBSAN_OPTIONS"));
+  SetVerbosity(common_flags()->verbosity);
 }
 
 }  // namespace __ubsan
diff --git a/contrib/compiler-rt/lib/ubsan/ubsan_flags.h b/contrib/compiler-rt/lib/ubsan/ubsan_flags.h
index c496469f5f41..b47f14e1e2fd 100644
--- a/contrib/compiler-rt/lib/ubsan/ubsan_flags.h
+++ b/contrib/compiler-rt/lib/ubsan/ubsan_flags.h
@@ -18,15 +18,17 @@
 namespace __ubsan {
 
 struct Flags {
-  bool halt_on_error;
-  bool print_stacktrace;
+#define UBSAN_FLAG(Type, Name, DefaultValue, Description) Type Name;
+#include "ubsan_flags.inc"
+#undef UBSAN_FLAG
+
+  void SetDefaults();
 };
 
 extern Flags ubsan_flags;
 inline Flags *flags() { return &ubsan_flags; }
 
-void InitializeCommonFlags();
-void InitializeFlags();
+void InitializeFlags(bool standalone);
 
 }  // namespace __ubsan
 
diff --git a/contrib/compiler-rt/lib/ubsan/ubsan_flags.inc b/contrib/compiler-rt/lib/ubsan/ubsan_flags.inc
new file mode 100644
index 000000000000..3260e8e13df8
--- /dev/null
+++ b/contrib/compiler-rt/lib/ubsan/ubsan_flags.inc
@@ -0,0 +1,24 @@
+//===-- ubsan_flags.inc -----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// UBSan runtime flags.
+//
+//===----------------------------------------------------------------------===//
+#ifndef UBSAN_FLAG
+# error "Define UBSAN_FLAG prior to including this file!"
+#endif
+
+// UBSAN_FLAG(Type, Name, DefaultValue, Description)
+// See COMMON_FLAG in sanitizer_flags.inc for more details.
+
+UBSAN_FLAG(bool, halt_on_error, false,
+           "Crash the program after printing the first error report")
+UBSAN_FLAG(bool, print_stacktrace, false,
+           "Include full stacktrace into an error report")
+
diff --git a/contrib/compiler-rt/lib/ubsan/ubsan_init.cc b/contrib/compiler-rt/lib/ubsan/ubsan_init.cc
index 6080e304c122..48fa492486dd 100644
--- a/contrib/compiler-rt/lib/ubsan/ubsan_init.cc
+++ b/contrib/compiler-rt/lib/ubsan/ubsan_init.cc
@@ -31,6 +31,7 @@ void __ubsan::InitIfNecessary() {
 #endif
   if (LIKELY(ubsan_inited))
    return;
+  bool standalone = false;
   if (0 == internal_strcmp(SanitizerToolName, "SanitizerTool")) {
     // WARNING: If this condition holds, then either UBSan runs in a standalone
     // mode, or initializer for another sanitizer hasn't run yet. In a latter
@@ -38,11 +39,12 @@ void __ubsan::InitIfNecessary() {
     // common flags. It means, that we are not allowed to *use* common flags
     // in this function.
     SanitizerToolName = "UndefinedBehaviorSanitizer";
-    InitializeCommonFlags();
+    standalone = true;
   }
   // Initialize UBSan-specific flags.
-  InitializeFlags();
+  InitializeFlags(standalone);
   SuppressionContext::InitIfNecessary();
+  InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
   ubsan_inited = true;
 }
 
diff --git a/contrib/compiler-rt/lib/ubsan/ubsan_type_hash.cc b/contrib/compiler-rt/lib/ubsan/ubsan_type_hash.cc
index 808a4332d01f..a388bcc6d72e 100644
--- a/contrib/compiler-rt/lib/ubsan/ubsan_type_hash.cc
+++ b/contrib/compiler-rt/lib/ubsan/ubsan_type_hash.cc
@@ -115,8 +115,7 @@ __ubsan::__ubsan_vptr_type_cache[__ubsan::VptrTypeCacheSize];
 
 /// \brief Determine whether \p Derived has a \p Base base class subobject at
 /// offset \p Offset.
-static bool isDerivedFromAtOffset(sptr Object,
-                                  const abi::__class_type_info *Derived,
+static bool isDerivedFromAtOffset(const abi::__class_type_info *Derived,
                                   const abi::__class_type_info *Base,
                                   sptr Offset) {
   if (Derived->__type_name == Base->__type_name)
@@ -124,7 +123,7 @@ static bool isDerivedFromAtOffset(sptr Object,
 
   if (const abi::__si_class_type_info *SI =
         dynamic_cast<const abi::__si_class_type_info*>(Derived))
-    return isDerivedFromAtOffset(Object, SI->__base_type, Base, Offset);
+    return isDerivedFromAtOffset(SI->__base_type, Base, Offset);
 
   const abi::__vmi_class_type_info *VTI =
     dynamic_cast<const abi::__vmi_class_type_info*>(Derived);
@@ -139,13 +138,13 @@ static bool isDerivedFromAtOffset(sptr Object,
     sptr OffsetHere = VTI->base_info[base].__offset_flags >>
                       abi::__base_class_type_info::__offset_shift;
     if (VTI->base_info[base].__offset_flags &
-          abi::__base_class_type_info::__virtual_mask) {
-      sptr VTable = *reinterpret_cast<const sptr *>(Object);
-      OffsetHere = *reinterpret_cast<const sptr *>(VTable + OffsetHere);
-    }
-    if (isDerivedFromAtOffset(Object + OffsetHere,
-                              VTI->base_info[base].__base_type, Base,
-                              Offset - OffsetHere))
+          abi::__base_class_type_info::__virtual_mask)
+      // For now, just punt on virtual bases and say 'yes'.
+      // FIXME: OffsetHere is the offset in the vtable of the virtual base
+      //        offset. Read the vbase offset out of the vtable and use it.
+      return true;
+    if (isDerivedFromAtOffset(VTI->base_info[base].__base_type,
+                              Base, Offset - OffsetHere))
       return true;
   }
 
@@ -154,15 +153,14 @@ static bool isDerivedFromAtOffset(sptr Object,
 
 /// \brief Find the derived-most dynamic base class of \p Derived at offset
 /// \p Offset.
-static const abi::__class_type_info *
-findBaseAtOffset(sptr Object, const abi::__class_type_info *Derived,
-                 sptr Offset) {
+static const abi::__class_type_info *findBaseAtOffset(
+    const abi::__class_type_info *Derived, sptr Offset) {
   if (!Offset)
     return Derived;
 
   if (const abi::__si_class_type_info *SI =
         dynamic_cast<const abi::__si_class_type_info*>(Derived))
-    return findBaseAtOffset(Object, SI->__base_type, Offset);
+    return findBaseAtOffset(SI->__base_type, Offset);
 
   const abi::__vmi_class_type_info *VTI =
     dynamic_cast<const abi::__vmi_class_type_info*>(Derived);
@@ -174,13 +172,12 @@ findBaseAtOffset(sptr Object, const abi::__class_type_info *Derived,
     sptr OffsetHere = VTI->base_info[base].__offset_flags >>
                       abi::__base_class_type_info::__offset_shift;
     if (VTI->base_info[base].__offset_flags &
-          abi::__base_class_type_info::__virtual_mask) {
-      sptr VTable = *reinterpret_cast<const sptr *>(Object);
-      OffsetHere = *reinterpret_cast<const sptr *>(VTable + OffsetHere);
-    }
-    if (const abi::__class_type_info *Base = findBaseAtOffset(
-            Object + OffsetHere, VTI->base_info[base].__base_type,
-            Offset - OffsetHere))
+          abi::__base_class_type_info::__virtual_mask)
+      // FIXME: Can't handle virtual bases yet.
+      continue;
+    if (const abi::__class_type_info *Base =
+          findBaseAtOffset(VTI->base_info[base].__base_type,
+                           Offset - OffsetHere))
       return Base;
   }
 
@@ -232,8 +229,7 @@ bool __ubsan::checkDynamicType(void *Object, void *Type, HashValue Hash) {
     return false;
 
   abi::__class_type_info *Base = (abi::__class_type_info*)Type;
-  if (!isDerivedFromAtOffset(reinterpret_cast<sptr>(Object), Derived, Base,
-                             -Vtable->Offset))
+  if (!isDerivedFromAtOffset(Derived, Base, -Vtable->Offset))
     return false;
 
   // Success. Cache this result.
@@ -247,9 +243,8 @@ __ubsan::DynamicTypeInfo __ubsan::getDynamicTypeInfo(void *Object) {
   if (!Vtable)
     return DynamicTypeInfo(0, 0, 0);
   const abi::__class_type_info *ObjectType = findBaseAtOffset(
-      reinterpret_cast<sptr>(Object),
-      static_cast<const abi::__class_type_info *>(Vtable->TypeInfo),
-      -Vtable->Offset);
+    static_cast<const abi::__class_type_info*>(Vtable->TypeInfo),
+    -Vtable->Offset);
   return DynamicTypeInfo(Vtable->TypeInfo->__type_name, -Vtable->Offset,
                          ObjectType ? ObjectType->__type_name : "<unknown>");
 }