[compiler-rt] r261658 - tsan: fix signal handling in ignored libraries

[Dmitry Vyukov via llvm-commits]

I've disabled this test on arm64 in r261728. I see that the failure is
on r261679.


On Wed, Feb 24, 2016 at 1:13 PM, Renato Golin <renato.golin at linaro.org> wrote:
> On 23 February 2016 at 17:16, Dmitry Vyukov via llvm-commits
> <llvm-commits at lists.llvm.org> wrote:
>> Author: dvyukov
>> Date: Tue Feb 23 11:16:26 2016
>> New Revision: 261658
>>
>> URL: http://llvm.org/viewvc/llvm-project?rev=261658&view=rev
>> Log:
>> tsan: fix signal handling in ignored libraries
>>
>> The first issue is that we longjmp from ScopedInterceptor scope
>> when called from an ignored lib. This leaves thr->in_ignored_lib set.
>> This, in turn, disables handling of sigaction. This, in turn,
>> corrupts tsan state since signals delivered asynchronously.
>> Another issue is that we can ignore synchronization in asignal
>> handler, if the signal is delivered into an IgnoreSync region.
>> Since signals are generally asynchronous, they should ignore
>> memory access/synchronization/interceptor ignores.
>> This could lead to false positives in signal handlers.
>
> Hi Dmitry,
>
> This failed our bot:
>
> http://lab.llvm.org:8011/builders/clang-cmake-aarch64-full/builds/1468
>
> ignore_lib4.cc:42:11: error: expected string not found in input
> // CHECK: DONE
>
> cheers,
> --renato