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

[Nemanja Ivanovic via llvm-dev]

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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