[cfe-dev] buildbot failure in LLVM on clang-x64-ninja-win7

[Reid Kleckner via cfe-dev]

I agree, the PCH and Modules tests are a never-ending source of flakiness
on Windows. I'm constantly disabling them by adding "REQUIRES: shell" or
"REQUIRES: can-remove-opened-file", and it's a total hack.

I'd love it if we could diagnose what's really going on here.

On Wed, Jul 27, 2016 at 11:49 AM, Robinson, Paul <paul.robinson at sony.com>
wrote:

> > -----Original Message-----
> > From: cfe-dev [mailto:cfe-dev-bounces at lists.llvm.org] On Behalf Of
> > Hahnfeld, Jonas via cfe-dev
> > Sent: Wednesday, July 27, 2016 4:18 AM
> > To: Renato Golin
> > Cc: gkistanova at gmail.com; cfe-dev at lists.llvm.org;
> mstester.llvm at gmail.com
> > Subject: Re: [cfe-dev] buildbot failure in LLVM on clang-x64-ninja-win7
> >
> > > -----Original Message-----
> > > From: Renato Golin [mailto:renato.golin at linaro.org]
> > > Sent: Wednesday, July 27, 2016 12:56 PM
> > > To: Hahnfeld, Jonas
> > > Cc: cfe-dev at lists.llvm.org; gkistanova at gmail.com;
> > mstester.llvm at gmail.com
> > > Subject: Re: [cfe-dev] buildbot failure in LLVM on clang-x64-ninja-win7
> > >
> > > On 27 July 2016 at 11:36, Hahnfeld, Jonas via cfe-dev <cfe-
> > > dev at lists.llvm.org> wrote:
> > > > Huh, Clang::Rmodule-build.m failed for no obvious reason and is green
> > > > again for the next build:
> > > > http://lab.llvm.org:8011/builders/clang-x64-ninja-win7/builds/14221
> > > >
> > > > Has anyone noticed this test in the past?
> > >
> > > A few pages of waterfall have shown no signs of R tests randomly
> > failing...
> > > This is weird.
> > >
> > > I'd let it be, for now. Both Galina and Denis are copied. If it happens
> > > again,
> > > they can investigate, as it doesn't seem related to your commit in any
> > way.
> > >
> > > cheers,
> > > --renato
> >
> > [Copying also Reid]
> >
> > http://lab.llvm.org:8011/builders/clang-x86-win2008-selfhost/builds/9307
> > was
> > red,
> > http://lab.llvm.org:8011/builders/clang-x86-win2008-selfhost/builds/9308
> > will
> > probably be green again (has already passed check 1 which failed before)
> >
> > The failing tests (which are different) both show:
> > remark: building module '...' as '...'
> > which triggers a CHECK-NOT and "error: 'remark' diagnostics seen but not
> > expected:"
> >
> > Thanks,
> > Jonas
>
>
> We put up a new internal Windows bot on Monday, and it has been suffering
> a lot of transient failures in Modules and PCH.  On the other hand,
> llvm-clang-lld-x86_64-scei-ps4-windows10pro-fast has not been seeing these
> (so far as I've noticed) so I wonder if there's some environmental thing
> going on.  I had been going on the assumption that there was an internal
> problematic patch, but if folks upstream are also seeing flakiness in these
> tests then maybe something else is at the root of it.
>
> Our new bot is using 32 threads; are these tests unusually susceptible
> to problems with parallel execution?
>
> FTR the list of tests I've seen with this behavior:
>
> Modules/fmodules-validate-once-per-build-session.c      3
> Modules/no-stale-modtime.m              13
> Modules/Rmodule-build.m                 3
> Modules/validate-system-headers.m       3
> PCH/headersearch.cpp                    3
> PCH/verify_pch.m                        6
>
> --paulr
>
>
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