buildbot failure in LLVM on sanitizer-windows

[Reid Kleckner via llvm-commits]

On Wed, Jul 19, 2017 at 3:27 PM, Davide Italiano <davide at freebsd.org> wrote:

> On Wed, Jul 19, 2017 at 3:12 PM,  <llvm.buildmaster at lab.llvm.org> wrote:
> > The Buildbot has detected a new failure on builder sanitizer-windows
> while building llvm.
> > Full details are available at:
> >  http://lab.llvm.org:8011/builders/sanitizer-windows/builds/14405
> >
> > Buildbot URL: http://lab.llvm.org:8011/
> >
> > Buildslave for this Build: sanitizer-windows
> >
> > Build Reason: scheduler
> > Build Source Stamp: [branch trunk] 308524
> > Blamelist: davide
> >
> > BUILD FAILED: failed run fuzzer tests
> >
> > sincerely,
> >  -The Buildbot
> >
>
> This failure doesn't really seem related to any of my (recent)
> changes, but I may have overlooked, in which case, please let me know
> if there's something I can help with.
>

This failure mode has happened twice in the last 100 builds:
http://lab.llvm.org:8011/builders/sanitizer-windows/builds/14405/steps/run%20fuzzer%20tests/logs/stdio
http://lab.llvm.org:8011/builders/sanitizer-windows/builds/14358/steps/run%20fuzzer%20tests/logs/stdio

We get a different OOM message than the one the test expects:
$ "FileCheck"
"C:\b\slave\sanitizer-windows\llvm\lib\Fuzzer\test\fuzzer-oom.test"
"--check-prefix=SINGLE_LARGE_MALLOC"
# command stderr:
C:\b\slave\sanitizer-windows\llvm\lib\Fuzzer\test\fuzzer-oom.test:8:22:
error: expected string not found in input
SINGLE_LARGE_MALLOC: libFuzzer: out-of-memory (malloc(53{{.*}}))
                     ^
<stdin>:1:1: note: scanning from here
INFO: Seed: 943780335
^
<stdin>:10:17: note: possible intended match here
==1244== ERROR: libFuzzer: out-of-memory (used: 387Mb; limit: 300Mb)
                ^
error: command failed with exit status: 1

kcc, can I relax the FileCheck CHECK to make this less flaky? It's probably
not worth digging in to find out why we get different messages.
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