[all-commits] [llvm/llvm-project] fff8b3: [msan] Block signals during MsanThread::TSDDtor (#...

[Thurston Dang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fff8b3236ab8ce8f99ea83a4de7c0e88687fc09d
      https://github.com/llvm/llvm-project/commit/fff8b3236ab8ce8f99ea83a4de7c0e88687fc09d
  Author: Thurston Dang <thurston at google.com>
  Date:   2024-07-11 (Thu, 11 Jul 2024)

  Changed paths:
    M compiler-rt/lib/msan/msan_linux.cpp

  Log Message:
  -----------
  [msan] Block signals during MsanThread::TSDDtor (#98405)

MSan may segfault inside a signal handler, if MSan instrumentation is
trying to access thread-local storage that has already been destroyed.
This fixes the issue by blocking asychronous signals inside
MsanThread::TSDDtor. This is based on an idea suggested by Paul
Pluzhnikov (block async signals in MsanThread::Destroy()) and refined by
Vitaly Buka.
    
Note: ed8565cf0b64ea5e88cc94f321b1870bb105d09d changed *BlockSignals to
only block asynchronous signals, despite the name.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications