tsan: disable flaky debug check

see the comment for details

llvm-svn: 224507

diff --git a/compiler-rt/lib/tsan/rtl/tsan_rtl.cc b/compiler-rt/lib/tsan/rtl/tsan_rtl.cc
index 7cb7008..fa39a87 100644 (file)
--- a/compiler-rt/lib/tsan/rtl/tsan_rtl.cc
+++ b/compiler-rt/lib/tsan/rtl/tsan_rtl.cc
@@ -715,8 +715,9 @@ bool ContainsSameAccess(u64 *s, u64 a, u64 sync_epoch, bool is_write) {
 #if defined(__SSE3__) && TSAN_SHADOW_COUNT == 4
   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);