[Twisted-Python] strange server crash

[Itamar Shtull-Trauring]

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.