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From: Adam Dinwoodie <adam@dinwoodie.org>
To: Ramsay Jones <ramsay@ramsayjones.plus.com>
Cc: GIT Mailing-list <git@vger.kernel.org>
Subject: Re: v2.15.0-rc1 test failure
Date: Thu, 12 Oct 2017 10:06:48 +0100
Message-ID: <20171012090648.GB6079@dinwoodie.org> (raw)
In-Reply-To: <338656d4-182b-563f-9195-515d213d4b6d@ramsayjones.plus.com>

On Thu, Oct 12, 2017 at 01:27:57AM +0100, Ramsay Jones wrote:
> On 11/10/17 23:34, Adam Dinwoodie wrote:
> [snip]
> > Hi Ramsay,
> > 
> > I assume, given you're emailing me, that this is a Cygwin failure?
> 
> Yes, sorry, I should have made that clear.
> 
> > t0021.15 has PERL as a requirement, and I see semi-regular failures from
> > Git tests that are Perl-based in one way or another (git-svn tests are
> > the most common problems).  I've not spotted t0021 failing in that way,
> > but it sounds like the same class of problem.
> 
> Yep, many moons ago, I used to run the svn tests (on Linux and cygwin)
> which would fail intermittently on cygwin. I didn't notice any problem
> with perl though.
> 
> > I dig into these failures when I see them, mostly by running the script
> > a few hundred times until I get the failure again, and they've always
> > been Perl itself segfaulting.  That points to the problem being in
> > Cygwin's Perl package rather than Git, and it's very unlikely to be
> > anything that's got worse in v2.15.0.
> 
> Since I stopped running the svn tests, the number of intermittent test failures on cygwin have dropped significantly, but haven't gone away
> completely.
> 
> I just finished the second test-suite run and, of course, t0021 ran
> without problem this time. Hmm, I don't think I have time to chase
> this down at the moment. I will keep your 'perl hypothesis' in mind
> for next time, however.

Evidence for my Perl hypothesis, which I offer at least as much so other
people can check my logic as anything else:

Here's a fairly typical set of verbose output from a test failing in
this way [0].  The critical bit is the line "error: git-svn died of
signal 11".  Since git-svn is a Perl script, and Perl is the sort of
interpreted language that would throw its own errors if it encountered a
script bug, the fact that it's hitting a segfault means there's a
problem of some ilk with the Perl interpreter itself.

[0]: https://github.com/me-and/Cygwin-Git/issues/13#issuecomment-211372448

Adam

      reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-11 22:15 Ramsay Jones
2017-10-11 22:25 ` Ramsay Jones
2017-10-11 22:34 ` Adam Dinwoodie
2017-10-11 23:08   ` Jonathan Nieder
2017-10-12  0:27   ` Ramsay Jones
2017-10-12  9:06     ` Adam Dinwoodie [this message]

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