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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