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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - llvm-cov timeout in buildbots may be caused by Unix signal implementation"
href="https://llvm.org/bugs/show_bug.cgi?id=30735">30735</a>
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<th>Summary</th>
<td>llvm-cov timeout in buildbots may be caused by Unix signal implementation
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>renato.golin@linaro.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Timeouts on check-all are getting slightly more common than they should.
Example:
<a href="http://lab.llvm.org:8011/builders/clang-cmake-armv7-a15/builds/15968">http://lab.llvm.org:8011/builders/clang-cmake-armv7-a15/builds/15968</a>
and many other PPC and AArch64 builds out there.
While building it locally on AArch64, I noticed my tests were locked in the
same way as we saw the buildbot once, with multiple instances of `llvm-cov` and
zero CPU utilisation.
Here's a few error messages I've seen on my local build (that weren't on the
buildbots, possibly because the timeout killed it first):
terminate called after throwing an instance of 'std::system_error'
what(): Unknown error -1
#0 0x0000ffff83f2e8ec llvm::sys::PrintStackTrace(llvm::raw_ostream&)
llvm/lib/Support/Unix/Signals.inc:402:0
I'm not sure this is related, but it sure it weird, given that those errors
weren't on `llvm-cov` itself, but on unrelated unit tests, like
`VerifierTest.StripInvalidDebugInfoLegacy`.</pre>
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