[LLVMdev] Confusing buildbot failure in LLVM on sanitizer-x86_64-linux

[Reid Kleckner]

It's a 20m timeout without output.

If you back up to the build and look at the 'annotate' step output, there's
this text:
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux/builds/17916/steps/annotate/logs/stdio

-- Testing: 258 tests, 16 threads --
Testing: 0 .. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..
command timed out: 1200 seconds without output, attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=3507.624426

The annotator should probably include that timeout text in the failing
step, so that sounds like a bug.

Another issue is that tsan times out sometimes. Should we be sending tsan
build failures to upstream developers? How often do they break tsan? I
suspect that when LLVM breaks tsan, it also breaks ASan, which isn't as
flaky. It might be better to mail the tsan failures to Dmitry or someone
and not upstream LLVM devs.

On Wed, May 13, 2015 at 9:59 AM, Diego Novillo <dnovillo at google.com> wrote:

> Alexey, I got mail from one of the tsan buildbots, claiming a breakage
> in tsan tests. But I cannot see anything on the logs it has for the
> build.
>
>
> http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux/builds/17916/steps/run%2064-bit%20tsan%20unit%20tests/logs/stdio
>
> Any ideas?  Thanks. Diego.
>
>
> ---------- Forwarded message ----------
> From:  <llvm.buildmaster at lab.llvm.org>
> Date: Wed, May 13, 2015 at 12:53 PM
> Subject: buildbot failure in LLVM on sanitizer-x86_64-linux
> To: Brendon Cahoon <bcahoon at codeaurora.org>, Diego Novillo
> <dnovillo at google.com>, Teresa Johnson <tejohnson at google.com>, Yaron
> Keren <yaron.keren at gmail.com>
> Cc: gkistanova at gmail.com
>
>
> The Buildbot has detected a new failure on builder
> sanitizer-x86_64-linux while building llvm.
> Full details are available at:
>  http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux/builds/17916
>
> Buildbot URL: http://lab.llvm.org:8011/
>
> Buildslave for this Build: sanitizer-buildbot1
>
> Build Reason: scheduler
> Build Source Stamp: [branch trunk] 237261
> Blamelist: bcahoon,dnovillo,tejohnson,yrnkrn
>
> BUILD FAILED: failed annotate failed run 64-bit tsan unit tests
>
> sincerely,
>  -The Buildbot
> _______________________________________________
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>
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