[llvm-dev] Non-determinism in libFuzzer tests on AArch64

[Kuba Mracek via llvm-dev]

> On Mar 22, 2019, at 10:36 AM, Kostya Serebryany <kcc at google.com> wrote:
> 
> I frankly don't even know who supports libFuzzer on aarch64. 
> Kuba? 
> 
> +Mitch Phillips <mailto:mitchp at google.com> who may get involved with libFuzzer/aarch64 in near future. 
> 
> On Fri, Mar 22, 2019 at 8:02 AM Diana Picus <diana.picus at linaro.org <mailto:diana.picus at linaro.org>> wrote:
> Hi,
> 
> I've seen this issue pop up on the mailing list a couple of times
> before with no resolution [1][2][3].
> 
> It has been getting really bad for our AArch64 buildbots lately. You
> can see a few examples at the end of my email [4], but we have the
> same failures on a couple of other bots as well.
> 
> Does anyone have any idea how to reproduce / investigate these issues?
> If not, is it reasonable to mark the tests as unsupported on AArch64?

I think that's fine, although AFAIK, these tests are very stable on x86, right?

Kuba

> 
> Thanks,
> Diana
> 
> [1] https://lists.llvm.org/pipermail/llvm-dev/2018-June/124334.html <https://lists.llvm.org/pipermail/llvm-dev/2018-June/124334.html>
> [2] http://lists.llvm.org/pipermail/llvm-dev/2019-January/128861.html <http://lists.llvm.org/pipermail/llvm-dev/2019-January/128861.html>
> [3] https://lists.llvm.org/pipermail/llvm-dev/2018-November/127701.html <https://lists.llvm.org/pipermail/llvm-dev/2018-November/127701.html>
> [4] clang-cmake-aarch64-lld failures:
> http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6264 <http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6264>
> http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6262 <http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6262>
> http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6260 <http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6260>
> http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6255 <http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6255>
> http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6253 <http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6253>
> http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6250 <http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6250>
> http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6247 <http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6247>
> http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6245 <http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6245>
> http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6237 <http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6237>
> http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6235 <http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6235>
> http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6229 <http://lab.llvm.org:8011/builders/clang-cmake-aarch64-lld/builds/6229>

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