cPickle segfault with nested dicts in threaded env

[Paul Rubin]

Carl Banks <pavlovevidence at gmail.com> writes:
> Since Python 2.7 is released, Python 2.5 is no longer accepting bug
> fixes, only security fixes.  So be aware.

Segfaults should be treated as security holes unless there's convincing
reasons that no exploit is possible.  So the bug should be reported
against 2.5 as well as later versions.