Nemanja Ivanovic via llvm-dev
2020-Sep-02 17:47 UTC
[llvm-dev] Flakey failure on clang-ppc64le-linux-multistage
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? > > > > _______________________________________________ > LLVM Developers mailing list > llvm-dev at lists.llvm.org > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20200902/7a2777d4/attachment.html>
David Blaikie via llvm-dev
2020-Sep-02 19:51 UTC
[llvm-dev] Flakey failure on clang-ppc64le-linux-multistage
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? >> >> >> >> _______________________________________________ >> LLVM Developers mailing list >> llvm-dev at lists.llvm.org >> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev >> >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20200902/347006b4/attachment.html>
Nemanja Ivanovic via llvm-dev
2020-Sep-03 12:02 UTC
[llvm-dev] Flakey failure on clang-ppc64le-linux-multistage
Sure. I didn't use lit or ninja. I simply copied the script produced by lit (/home/buildbots/ppc64le-clang-multistage-test/clang-ppc64le-multistage/stage1/tools/clang/test/Driver/Output/target-override.c.script) into a temporary directory (along with a deep copy of the build directory). I modified the paths in the script to point to the temporary directory. Then I ran the script in a loop. For running a bunch in parallel, I just produced a wrapper script to invoke that one: target-override.c.script $LINENO & target-override.c.script $LINENO & target-override.c.script $LINENO & ... wait And ran that in a loop. For thousands of iterations... On Wed, Sep 2, 2020 at 3:51 PM David Blaikie <dblaikie at gmail.com> wrote:> 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? >>> >>> >>> >>> _______________________________________________ >>> LLVM Developers mailing list >>> llvm-dev at lists.llvm.org >>> https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev >>> >>-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20200903/cf98252b/attachment-0001.html>