1 files changed, 30 insertions, 0 deletions
diff --git a/test/msan/realloc-large-origin.cc b/test/msan/realloc-large-origin.cc
new file mode 100644
index 000000000000..de39394cbb79
--- /dev/null
+++ b/test/msan/realloc-large-origin.cc
@@ -0,0 +1,30 @@
+// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -m64 -O0 %s -o %t && not %run %t >%t.out 2>&1
+// RUN: FileCheck %s < %t.out
+// RUN: %clangxx_msan -fsanitize-memory-track-origins=2 -m64 -O2 %s -o %t && not %run %t >%t.out 2>&1
+// RUN: FileCheck %s < %t.out
+
+// This is a regression test: there used to be broken "stored to memory at"
+// stacks with
+//   in __msan_memcpy
+//   in __msan::MsanReallocate
+// and nothing below that.
+
+#include <stdlib.h>
+int main(int argc, char **argv) {
+  char *p = (char *)malloc(100);
+  p = (char *)realloc(p, 10000);
+  char x = p[50];
+  free(p);
+  return x;
+
+// CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
+// CHECK:   {{#0 0x.* in main .*realloc-large-origin.cc:}}[[@LINE-3]]
+
+// CHECK:  Uninitialized value was stored to memory at
+// CHECK:   {{#0 0x.* in .*realloc}}
+// CHECK:   {{#1 0x.* in main .*realloc-large-origin.cc:}}[[@LINE-10]]
+
+// CHECK:   Uninitialized value was created by a heap allocation
+// CHECK:   {{#0 0x.* in .*malloc}}
+// CHECK:   {{#1 0x.* in main .*realloc-large-origin.cc:}}[[@LINE-15]]
+}