diff options
Diffstat (limited to 'test/tsan/large_malloc_meta.cc')
-rw-r--r-- | test/tsan/large_malloc_meta.cc | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/test/tsan/large_malloc_meta.cc b/test/tsan/large_malloc_meta.cc new file mode 100644 index 000000000000..e83004824a3a --- /dev/null +++ b/test/tsan/large_malloc_meta.cc @@ -0,0 +1,28 @@ +// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s +#include "test.h" +#include <sys/mman.h> + +// Test for previously unbounded memory consumption for large mallocs. +// Code allocates a large memory block (that is handled by LargeMmapAllocator), +// and forces allocation of meta shadow for the block. Then freed the block. +// But meta shadow was not unmapped. Then code occupies the virtual memory +// range of the block with something else (that does not need meta shadow). +// And repeats. As the result meta shadow growed infinitely. +// This program used to consume >2GB. Now it consumes <50MB. + +int main() { + for (int i = 0; i < 1000; i++) { + const int kSize = 1 << 20; + const int kPageSize = 4 << 10; + volatile int *p = new int[kSize]; + for (int j = 0; j < kSize; j += kPageSize / sizeof(*p)) + __atomic_store_n(&p[i], 1, __ATOMIC_RELEASE); + delete[] p; + mmap(0, kSize * sizeof(*p) + kPageSize, PROT_NONE, MAP_PRIVATE | MAP_ANON, + -1, 0); + } + fprintf(stderr, "DONE\n"); + return 0; +} + +// CHECK: DONE |