[llvm-bugs] [Bug 38975] New: [ThinLTO] cache tests appear to be flaky

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38975

            Bug ID: 38975
           Summary: [ThinLTO] cache tests appear to be flaky
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Linker
          Assignee: unassignedbugs at nondot.org
          Reporter: jh7370.2008 at my.bristol.ac.uk
                CC: llvm-bugs at lists.llvm.org

Noticed this when I tried committing r342233. A build bot failed
(http://lab.llvm.org:8011/builders/clang-with-thin-lto-ubuntu/builds/12667)
when running lld's "ELF/lto/cache.ll". I reverted the change, although looking
at the code, I can't see any way my change could have interacted with it. The
buildbot went green.

However, I then noticed that a practically identical test failed in the same
manner a bit later, some time after my revert landed. See
http://lab.llvm.org:8011/builders/clang-with-lto-ubuntu/builds/10313, where
"tools/gold/X86/cache.ll" failed. The test passed on the next run of the
buildbot, with no related changes.

And just now the LLD test failed again:
http://lab.llvm.org:8011/builders/clang-with-lto-ubuntu/builds/10315.

I'm guessing the root cause of these test failures is the same.

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