[Twisted-Python] strange server crash

[Alvin Delagon]

We also had a similar problem like this on one of our long running servers
although I didn't find some time to archive the logs. I'm not sure if it's
related; but I can see clearly that you're using python2.4 and it has some
funky issues with its memory management (
http://evanjones.ca/python-memory-part2.html).

We don't experience it anymore ever since we upgraded to python2.5.

---
Alvin


On Sun, Mar 22, 2009 at 11:10 PM, Christopher Armstrong <
radix at twistedmatrix.com> wrote:

> On Sun, Mar 22, 2009 at 10:32 AM, Itamar Shtull-Trauring
> <itamar at itamarst.org> wrote:
> > On Sat, 2009-03-21 at 20:02 -0700, Alec Matusis wrote:
> >
> >>           File "/nail/live/im/myserv/service.py", line 1199, in logout
> >>
> >>             if self.nick in session.sellers:
> >>
> >>         exceptions.AttributeError: WLResultSet instance has no
> >> attribute 'sellers'
> >>
> >>
> >>
> >> This last error repeated about 1000 times for different clients, after
> >> which the segfault occurred.
> >>
> >> The problem is, that “session” is an instance of a Session class that
> >> is defined in the code, it is NEITHER a Deferred NOR an instance  of
> >> WLResultSet class- these are completely different classes, and there’s
> >> no possible way in the code for variable session to become an instance
> >> of Deferred.
> >
> > I've seen this happen - once. My guess then was memory corruption of
> > some sort (somewhere in the C level). If you have any custom C
> > extensions you might want to try valgrind.
>
> I'd like to offer a slightly stronger suggestion that this segfault is
> not the fault of any pure Python code (such as Twisted), but rather
> some C extension that you're using, or perhaps a bug in the Python
> runtime itself. The weird attribute errors for the wrong classes are
> probably caused by memory corruption leading up to the segfault.
>
>
> --
> Christopher Armstrong
> http://radix.twistedmatrix.com/
> http://planet-if.com/
> http://canonical.com/
>
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