[Python-Dev] head crashing (was: Fwd: [Python-checkins] buildbot warnings in x86 mvlgcc trunk)

[Neal Norwitz]

In rev 54982 (the first time this crash was seen), I see something
which might create a problem.  In python/trunk/Modules/posixmodule.c
(near line 6300):

+       PyMem_FREE(mode);
       Py_END_ALLOW_THREADS

Can you call PyMem_FREE() without the GIL held?  I couldn't find it
documented either way.

Of the 3 failures I know of, below is the intersection of the tests
that were run prior to crashing:

set(['test_threadedtempfile', 'test_cgi', 'test_dircache', 'test_set',
'test_binascii', 'test_imp', 'test_multibytecodec', 'test_weakref',
'test_ftplib', 'test_posixpath', 'test_xmlrpc', 'test_urllibnet',
'test_old_mailbox', 'test_distutils', 'test_site', 'test_runpy',
'test_fork1', 'test_traceback'])

n
--

On 4/30/07, Neal Norwitz <nnorwitz at gmail.com> wrote:
> This is the third time I've seen a crash on 2 different machines.
> This is the first time I noticed this unexplained crash:
>
> http://python.org/dev/buildbot/all/amd64%20gentoo%20trunk/builds/1983/step-test/0
>
> That was at r54982.
>
> I tried to reproduce this: with a non-debug build, with a debug build,
> with valgrind with both types of build.  I could never reproduce it.
> Valgrind did not report any errors either.
>
> Here is the third failure:
>
> http://python.org/dev/buildbot/all/amd64%20gentoo%20trunk/builds/1986/step-test/0
>
> The failure below prints:
> python: Objects/obmalloc.c:746: PyObject_Malloc: Assertion `bp !=
> ((void *)0)' failed.
>
> which probably doesn't really help since the corruption has already
> occurred.  See http://python.org/dev/buildbot/all/x86%20mvlgcc%20trunk/builds/497/step-test/0
>
> Anyone have ideas what might have caused this?
>
> n
> --
>
> ---------- Forwarded message ----------
> From: buildbot at python.org <buildbot at python.org>
> Date: Apr 30, 2007 11:17 PM
> Subject: [Python-checkins] buildbot warnings in x86 mvlgcc trunk
> To: python-checkins at python.org
>
>
> The Buildbot has detected a new failure of x86 mvlgcc trunk.
> Full details are available at:
>  http://www.python.org/dev/buildbot/all/x86%2520mvlgcc%2520trunk/builds/497
>
> Buildbot URL: http://www.python.org/dev/buildbot/all/
>
> Build Reason:
> Build Source Stamp: [branch trunk] HEAD
> Blamelist: georg.brandl
>
> Build had warnings: warnings test
>
> Excerpt from the test logfile:
> make: *** [buildbottest] Aborted (core dumped)
>
> sincerely,
>  -The Buildbot
>
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