diff options
Diffstat (limited to 'lib/msan')
| -rw-r--r-- | lib/msan/msan.h | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/lib/msan/msan.h b/lib/msan/msan.h index 49c0a3079..0709260ee 100644 --- a/lib/msan/msan.h +++ b/lib/msan/msan.h @@ -329,11 +329,20 @@ const int STACK_TRACE_TAG_POISON = StackTrace::TAG_CUSTOM + 1; StackTrace::GetCurrentPc(), GET_CURRENT_FRAME(), \ common_flags()->fast_unwind_on_malloc) +// For platforms which support slow unwinder only, we restrict the store context +// size to 1, basically only storing the current pc. We do this because the slow +// unwinder which is based on libunwind is not async signal safe and causes +// random freezes in forking applications as well as in signal handlers. #define GET_STORE_STACK_TRACE_PC_BP(pc, bp) \ BufferedStackTrace stack; \ - if (__msan_get_track_origins() > 1 && msan_inited) \ - GetStackTrace(&stack, flags()->store_context_size, pc, bp, \ - common_flags()->fast_unwind_on_malloc) + if (__msan_get_track_origins() > 1 && msan_inited) { \ + if (!SANITIZER_CAN_FAST_UNWIND) \ + GetStackTrace(&stack, Min(1, flags()->store_context_size), pc, bp, \ + false); \ + else \ + GetStackTrace(&stack, flags()->store_context_size, pc, bp, \ + common_flags()->fast_unwind_on_malloc); \ + } #define GET_FATAL_STACK_TRACE_PC_BP(pc, bp) \ BufferedStackTrace stack; \ |