[llvm-dev] greendragon build noisy due to mmap_stress.cc

[Kostya Serebryany via llvm-dev]

On Wed, Jan 20, 2016 at 1:31 PM, Chris Matthews <chris.matthews at apple.com>
wrote:

> I worded that poorly, the Jenkins check I added will explain to the user
> that we know this fails sometimes.
>
> On Jan 20, 2016, at 1:30 PM, Chris Matthews <chris.matthews at apple.com>
> wrote:
>
> I have added a Jenkins check for this test, which explains why it fails on
> some builds.
>
> Can we change the test to keep its output?  Will it just be blank anyways?
>
>
The test simply prints everything to stdout.
It's the lit driver that hides the output.

Maybe someone with a Mac can run this test manually (with exact same build
command line)
a few thousand times? I continue to suspect a kernel bug.


>
> On Jan 20, 2016, at 1:23 PM, Kostya Serebryany <kcc at google.com> wrote:
>
> The test fails again:
> http://lab.llvm.org:8080/green/job/clang-stage1-cmake-RA_check/9739/testReport/junit/ThreadSanitizer/ThreadSanitizer/mmap_stress_cc/
> But unfortunately lit does not provide the original log, so we still don't
> know why...
>
> On Wed, Jan 13, 2016 at 1:11 PM, Chris Matthews <chris.matthews at apple.com>
> wrote:
>
>> These ran to completion without error. :(
>>
>> On Jan 12, 2016, at 3:23 PM, Chris Matthews <chris.matthews at apple.com>
>> wrote:
>>
>> I’m running this on green-dragon-03 which is running OSX 10.10.5.
>>
>> /Users/buildslave/jenkins/sharedspace/clang-stage1-cmake-RA_workspace\@2/clang-build/bin/clang++
>> ../llvm/projects/compiler-rt/test/tsan/mmap_stress.cc -lpthread
>> while true; do for((i=0;i<10;i++)); do ./a.out || echo
>> ===============FAILED================ & done ; wait; done
>>
>> Seems like it is getting about 225 runs a minute, so it will take about 8
>> hours to complete 100k runs.
>>
>> On Jan 12, 2016, at 1:28 PM, Tobias Grosser via llvm-dev <
>> llvm-dev at lists.llvm.org> wrote:
>>
>> On 01/12/2016 10:26 PM, Kostya Serebryany wrote:
>>
>> Hi Tobias,
>>
>> What machine is that?
>> We have seen this and similar tests be flaky on older Linux kernels due
>> to kernel bug(s).
>> May I ask you to run the same test (just built with clang) on the same
>> machine for ~100000 times and see if it ever crashes?
>>
>> clang++ ~/llvm/projects/compiler-rt/test/tsan/mmap_stress.cc -lpthread
>> while true; do for((i=0;i<10;i++)); do ./a.out || echo
>> ===============FAILED================ & done ; wait; done
>>
>>
>> Add Michael again (who might have access to this Machine).
>>
>> Tobias
>> _______________________________________________
>> LLVM Developers mailing list
>> llvm-dev at lists.llvm.org
>> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>>
>>
>>
>>
>
>
>
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