[MSan] Print current stack on CHECK violation

Summary:
Print current stack on CHECK violation to aid debugging and
match other sanitizers functionality.

Reviewers: eugenis

Subscribers: delcypher, llvm-commits, #sanitizers

Differential Revision: https://reviews.llvm.org/D43692

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@326105 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 16 insertions, 0 deletions

diff --git a/test/msan/check-handler.cc b/test/msan/check-handler.cc
new file mode 100644
index 000000000..4721f8c30
--- /dev/null
+++ b/test/msan/check-handler.cc
@@ -0,0 +1,16 @@
+// RUN: %clangxx_msan -O0 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
+
+// Verify that CHECK handler prints a stack on CHECK fail.
+
+#include <stdlib.h>
+
+int main(void) {
+  // Allocate chunk from the secondary allocator to trigger CHECK(IsALigned())
+  // in its free() path.
+  void *p = malloc(8 << 20);
+  free(reinterpret_cast<char*>(p) + 1);
+  // CHECK: MemorySanitizer: bad pointer
+  // CHECK: MemorySanitizer CHECK failed
+  // CHECK: #0
+  return 0;
+}