SegFault using deque in 2.4b3

[Stefan Behnel]

Hi!

In Python 2.4b3, the deque is causing a segfault on two different machines I tested on.

With deque, my program runs fine for a while (at least some tens of seconds up to minutes) and then suddenly segfaults.

I'm sorry I can't tell exactly when, but I'm running an application that uses a few hundred deques where elements are appendleft()ed and pop()ed (simple queue). As the application is rather complex (and I didn't read about this error before anywhere), I guess it could be quite a bit of work for me to come up with a test case.

At least I couldn't reproduce it with simple loops running interleaved pop/appendleft and my machine has enough memory, so that's not the problem. I'm not using things like Psyco either, which BTW (in 2.4) segfaults as well (1.2 and CVS).

Anyway, when I replace the deque with this:

     class deque(list):
         def appendleft(self, item):
             self.insert(0, item)

the segfault disappears, so it's definitely deque's fault.

Has anyone else observed this problem?

Stefan