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

[Hans Wennborg via llvm-dev]

Many thanks for digging into this, and sorry for my slow reply.

Kamil: it sounds like your commit is involved here. Any idea what's happening?

Dimitry: If we don't find anyone to debug and fix this before the
release, how bad is it for FreeBSD? Can it be worked around downstream
if 8.0.0 ships without a fix? Since I'm not entirely sure how
supported this functionality is on FreeBSD, I'm not sure how much we
should block the release on it.

Kim: If you can bisect to find that $somewhere revision, that would be
very helpful.

Thanks,
Hans

On Sun, Feb 24, 2019 at 11:36 AM Kim Gräsman <kim.grasman at gmail.com> wrote:
>
> 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
> > >> _______________________________________________
> > >> cfe-dev mailing list
> > >> cfe-dev at lists.llvm.org
> > >> https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev