[Release-testers] [cfe-dev] [8.0.0 Release] Need help with PR40761: Sanitizers broken on FreeBSD

[Kim Gräsman via Release-testers]

Hi again,

It took me a while to get the environment up and running. Turns out
the sanitizer test suite is in pretty bad shape overall on FreeBSD.

The target reproducing the DEADLYSIGNAL loop is check-asan-dynamic.

I ran the bisect all the way from release/7.x to release/8.x --

* release/7.x - normal test run
* $somewhere - another hang bug where the lit invocation stops dead
immediately after warning about %shared_libasan:

    llvm-lit: /home/kimgr/code/llvm-project/compiler-rt/test/asan/lit.cfg:110:
warning: %shared_libasan substitution not set but dynamic ASan is
available.

* 342d03e71fbc302cf5a1683dcd03c366bf96d4bb (Reimplement Thread Static
Data ASan routines with TLS) - AddressSanitizer:DEADLYSIGNAL

The DEADLYSIGNAL behavior is in fact introduced by
https://reviews.llvm.org/D55596. But it looks like FreeBSD was broken
even before this. I'll see if I can bisect where $somewhere is.

- Kim

On Fri, Feb 22, 2019 at 1:39 PM Hans Wennborg <hans at chromium.org> wrote:
>
> That's excellent!
>
> I think the check-sanitizer target should cover it.
>
> Thanks,
> Hans
>
> On Fri, Feb 22, 2019 at 1:34 PM Kim Gräsman <kim.grasman at gmail.com> wrote:
> >
> > Hi Hans,
> >
> > I have a freebsd machine and some time to spare this weekend.
> >
> > Could you offer the minimal git bisect command to repro? I'm hoping not to have to run the full check-clang test suite if there's a smaller subset of tests for ASAN.
> >
> > Thanks,
> > - Kim
> >
> > On Thu, Feb 21, 2019, 11:27 Hans Wennborg via cfe-dev <cfe-dev at lists.llvm.org> wrote:
> >>
> >> I think the release is looking pretty good, but there is one blocker
> >> that's worrying me: https://llvm.org/PR40761
> >>
> >> From what I understand, ASan et al. used to work on FreeBSD but don't
> >> anymore, and there's nobody working on it.
> >>
> >> Is there someone who has access to a FreeBSD machine that could help
> >> investigate this? Just getting it bisected would be super helpful.
> >>
> >> Thanks,
> >> Hans
> >> _______________________________________________
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> >> cfe-dev at lists.llvm.org
> >> https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev