[llvm-dev] Flakey failure on clang-ppc64le-linux-multistage

[David Blaikie via llvm-dev]

Thanks for looking into it!

Could you describe your test process in more detail? Were you running lit
from your script? Running the build system (ninja?)?

On Wed, Sep 2, 2020 at 10:47 AM Nemanja Ivanovic <nemanja.i.ibm at gmail.com>
wrote:

> Well, I am at my wit's end. I have copied over the script and directories
> for this test case and run it a few million times. First I was running one
> at a time, then I switched to kicking off 1000 at a time. All the while,
> the bots continued to run on the same machine. The script never failed even
> once. I am not sure if this has something to do with Python as part of
> llvm-lit or what is going on.
> I am thinking that the best course of action for us is to mark this test
> case UNSUPPORTED for PPC.
>
> On Wed, Sep 2, 2020 at 12:41 PM Nemanja Ivanovic via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Interesting, thanks for bringing this to our attention. I just took a
>> quick look through the last 100 builds and this test has failed 13 times.
>> This is certainly something we need to look at. We will investigate and see
>> if we can make any sense of this.
>>
>> Nemanja Ivanovic
>> LLVM PPC Backend Development
>> IBM Toronto Lab
>> Email: nemanjai at ca.ibm.com
>> Phone: 905-413-3388
>>
>>
>>
>> ----- Original message -----
>> From: David Blaikie <dblaikie at gmail.com>
>> To: llvm-dev <llvm-dev at lists.llvm.org>, Nico Weber <thakis at chromium.org>,
>> Serge Pavlov <sepavloff at gmail.com>, powerllvm at ca.ibm.com
>> Cc:
>> Subject: [EXTERNAL] Flakey failure on clang-ppc64le-linux-multistage
>> Date: Tue, Sep 1, 2020 6:10 PM
>>
>> Seems there were a couple of correlated failures that appear to be flakes
>> on this buildbot recently:
>>
>> green:
>> http://lab.llvm.org:8011/builders/clang-ppc64le-linux-multistage/builds/13974
>> red:
>> http://lab.llvm.org:8011/builders/clang-ppc64le-linux-multistage/builds/13975 (target-override.c
>> during stage 1, seems to be missing the directory/symlink it just created)
>> red:
>> http://lab.llvm.org:8011/builders/clang-ppc64le-linux-multistage/builds/13976 (same
>> test failure as the last, but during stage 2, not stage 1)
>> green:
>> http://lab.llvm.org:8011/builders/clang-ppc64le-linux-multistage/builds/13977
>>
>> Including Nico & Pavlov as the people who wrote/edited the test, but I'm
>> guessing this is something interesting going on on the buildbot itself?
>>
>> powerllvm at ca.ibm.com, whoever you are on the end of that mailing list -
>> could you take a look at this? Possibly manually running that test in a
>> loop a bunch of times to see if it fails sometimes & try to help us
>> understand why?
>>
>>
>>
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>>
>
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