No, I've just tested /trunk, including r64595, and the Segmentation
fault is still present, eg:

Python 2.6b1+ (trunk:64998, Jul 16 2008, 15:50:22) 
[GCC 4.1.1 20070105 (Red Hat 4.1.1-52)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.setrecursionlimit(40000)
>>> class rec(object):
...   child = None
...   def __init__(self, counter):
...     if counter > 0:
...       self.child = rec(counter-1)
... 
>>> mychain = rec(2600)
>>> from cPickle import Pickler
>>> from cStringIO import StringIO
>>> stream = StringIO()
>>> p = Pickler(stream, 1)
>>> p.dump(mychain)
Segmentation fault