[all-commits] [llvm/llvm-project] c7081b: tsan: fix crash during thread exit

[Dmitry Vyukov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c7081b5b4cb57f27e6a075e1b5a63b7951cd8a7a
      https://github.com/llvm/llvm-project/commit/c7081b5b4cb57f27e6a075e1b5a63b7951cd8a7a
  Author: Dmitry Vyukov <dvyukov at google.com>
  Date:   2021-11-16 (Tue, 16 Nov 2021)

  Changed paths:
    M compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cpp
    A compiler-rt/test/tsan/Linux/sethostent.cpp

  Log Message:
  -----------
  tsan: fix crash during thread exit

Use of gethostent provokes caching of some resources inside of libc.
They are freed in __libc_thread_freeres very late in thread lifetime,
after our ThreadFinish. __libc_thread_freeres calls free which
previously crashed in malloc hooks.
Fix it by setting ignore_interceptors for finished threads,
which in turn prevents malloc hooks.

Reviewed By: melver

Differential Revision: https://reviews.llvm.org/D113989