[llvm-dev] Need help reproducing a bug

[Michael Zolotukhin via llvm-dev]

Hi,

Recently I committed a change (r330175) that passed all my testing, but failed on several bots. Namely, these are the failed ones:
http://lab.llvm.org:8011/builders/clang-with-thin-lto-ubuntu/builds/9803 <http://lab.llvm.org:8011/builders/clang-with-thin-lto-ubuntu/builds/9803>
http://lab.llvm.org:8011/builders/clang-with-lto-ubuntu/builds/8173 <http://lab.llvm.org:8011/builders/clang-with-lto-ubuntu/builds/8173>
http://lab.llvm.org:8011/builders/lld-x86_64-freebsd/builds/18082 <http://lab.llvm.org:8011/builders/lld-x86_64-freebsd/builds/18082>

I reverted the change (r330180), but now I’m stuck with how to proceed with it, as I can’t reproduce any of these.

So far I’ve tried building clang with asan and using this sanitized clang to build clang and lld one more time and run make check - none of these failed on my machine. What else could I try to catch the issue?

In case you are interested in details and/or want to try to reproduce it, you’ll need to revert r330180 (and thus reapply r330175). The change is about using a new faster SSAUpdater in Jump Threading, more details are available in the phabricator: https://reviews.llvm.org/D44282 <https://reviews.llvm.org/D44282>.

Thanks,
Michael



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