【Tsan】【Bug】Calling siglongjmp in signal handler will cause the ignore_reads_and_writes check to fail

[847567161]

Hello guys, 

  I raised an issue here, and I send this email because the problem is urgent：

     https://github.com/google/sanitizers/issues/1759

Tsan disable ignores in CallUserSignalHandler when ignores are enabled before call signal handler,but it will make "CHECK_GT(thr->ignore_reads_and_writes, 0);" failed in ThreadIgnoreEnd if someone use siglongjmp in signal handler:

dlopen

• call ThreadIgnoreBegin
  • thr->ignore_reads_and_writes++
• trigger signal
  • CallUserSignalHandler
  •   thr->ignore_reads_and_writes = 0
  •   Call siglongjmp to jump to a normal position
• call ThreadIgnoreEnd
  • CHECK_GT(thr->ignore_reads_and_writes, 0); // failed!

https://gitee.com/openharmony/third_party_llvm-project/blob/master/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp#L2006

Looking forward to your reply.

Regards,

 Chuang