[compiler-rt] af7fa27 - [sanitizer] VReport thread status for failed PTRACE_ATTACH (#111901)

[via llvm-commits]

Author: Vitaly Buka
Date: 2024-10-10T14:53:16-07:00
New Revision: af7fa2710c998811dd72799799798f2bd4d9bff4

URL: https://github.com/llvm/llvm-project/commit/af7fa2710c998811dd72799799798f2bd4d9bff4
DIFF: https://github.com/llvm/llvm-project/commit/af7fa2710c998811dd72799799798f2bd4d9bff4.diff

LOG: [sanitizer] VReport thread status for failed PTRACE_ATTACH (#111901)

Such threads can cause false leak reports,
but often it's hard to diagnose the reason of
failed PTRACE_ATTACH. Maybe we can find
a clue from `/proc/*/task/*/status`

Added: 
    

Modified: 
    compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cpp

Removed: 
    


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diff  --git a/compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cpp
index d9f803a276dadc..6ebca965f6a334 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cpp
@@ -228,6 +228,8 @@ bool ThreadSuspender::SuspendAllThreads() {
     for (tid_t tid : threads) {
       if (SuspendThread(tid))
         retry = true;
+      else
+        VReport(2, "%llu/status: %s\n", tid, thread_lister.LoadStatus(tid));
     }
     if (retry)
       VReport(1, "SuspendAllThreads retry: %d\n", i);