[compiler-rt] r231367 - tsan: fix signal handling during stop-the-world

Tue Mar 24 12:59:52 PDT 2015

The bot is very heavily loaded, it has 40+ processes running since March 1:

41500 buildsl+  20   0 1208380 1.040g   1044 R 100.0  2.2  17567:12
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41534 buildsl+  20   0  347420 246492    976 R 100.0  0.5  18093:57
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41438 buildsl+  20   0  535216 427720   1020 R 100.0  0.9  17862:52
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41364 buildsl+  20   0  538920 427928   1132 R  99.6  0.9  17835:58
clang-3.7

41400 buildsl+  20   0  481600 374952   1044 R  99.0  0.8  17961:05
clang-3.7

buildsl+ 41534 55.0  0.4 347420 246500 ?       R    Mar01 18094:29
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I would expect that rebooting the bot will resolve the flakiness.

On Mon, Mar 23, 2015 at 1:26 PM, Kostya Serebryany <kcc at google.com> wrote:

>
>
> On Fri, Mar 20, 2015 at 9:59 AM, Galina Kistanova <
> gkistanova at accesssoftek.com> wrote:
>
>> Sure I can set you up with the access. That's one of the purposes of
>> having the bots in the lab.
>>
>> Just tell me what you are going to do there, so I could figure out the
>> permissions, and when you will be accessing it, so I would stop the builder.
>>
>
> I will need the machine to build and run a single C++ test,
> so all I need is the access to the clang binary built on this builder
> and an ability to compile a test  using that clang.
> No need to stop the builder.
>
>>
>> Please also send me directly the ssh key you will be using.
>>
>
> ok!
>
>
>>
>> Thank you
>>
>> Galina
>>
>>
>> -----Original Message-----
>> From: hwennborg at google.com [mailto:hwennborg at google.com] On Behalf Of
>> Hans Wennborg
>> Sent: Thursday, March 19, 2015 1:43 PM
>> To: David Blaikie
>> Cc: Kostya Serebryany; Galina Kistanova; llvm-commits at cs.uiuc.edu
>> Subject: Re: [compiler-rt] r231367 - tsan: fix signal handling during
>> stop-the-world
>>
>> I'm hitting this when running 'ninja check-all' on my machine.
>>
>> If I just run the individual run line, it doesn't crash though.
>>
>> On Mon, Mar 16, 2015 at 11:37 AM, David Blaikie <dblaikie at gmail.com>
>> wrote:
>> > Not my bot (& I seem to have lost my local reproduction - it was failing
>> > pretty consistently for me last week - perhaps my machine instnalled a
>> > software update in the interim), +Galina who might have some more info
>> about
>> > as-bldslv8.
>> >
>> > On Mon, Mar 16, 2015 at 11:34 AM, Kostya Serebryany <kcc at google.com>
>> wrote:
>> >>
>> >>
>> >>
>> >> On Sun, Mar 15, 2015 at 12:34 AM, Dmitry Vyukov <dvyukov at google.com>
>> >> wrote:
>> >>>
>> >>> On Sun, Mar 15, 2015 at 12:32 AM, David Blaikie <dblaikie at gmail.com>
>> >>> wrote:
>> >>> >> Added:
>> >>> >>     compiler-rt/trunk/test/asan/TestCases/Linux/leak_check_segv.cc
>> >>> >>
>> >>> >>
>> >>> >>
>> compiler-rt/trunk/test/asan/TestCases/Linux/signal_during_stop_the_world.cc
>> >>> >>
>> >>> >>
>> >>> >>
>> compiler-rt/trunk/test/sanitizer_common/TestCases/Linux/signal_segv_handler.cc
>> >>> >
>> >>> >
>> >>> > This test appears to be flaky. Failing every second run here:
>> >>> >
>> >>> >
>> http://lab.llvm.org:8011/builders/clang-x86_64-linux-selfhost-abi-test/builds/2871
>> >>> > and failing for me locally.
>> >>>
>> >>>
>> >>> The test does not fail for a bunch of us locally (I run it 5000 times
>> >>> locally).
>> >>> Can you please run it locally _without_ any tool? Does it fail?
>> >>
>> >>
>> >> Yea, we tried reproducing it on multiple machines with no luck.
>> >> Can we have access to the bot?
>>
>
>
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