New submission from Darryl Dixon <[EMAIL PROTECTED]>: In at least Python 2.4, using cPickle.Pickler to try and pickle a nested chain of objects more than about 2590 objects deep causes the Python interpreter to segfault. This doesn't seem to happen when using the pure Python pickle module.
It is not memory related (witness that the pure Python module can achieve depths much greater than this just fine), and does not seem to be directly related to system architecture (happens on both i386 and on x86_64 (32bit and 64bit)). Sample interpreter session to replicate: >>> # Let's cause cPickle to segfault: >>> from cPickle import Pickler as cPickler >>> class rec: ... child = None ... def __init__(self, counter): ... if counter > 0: ... self.child = rec(counter-1) ... >>> import sys >>> sys.setrecursionlimit(10000) >>> mychain = rec(2600) >>> from cStringIO import StringIO >>> stream = StringIO() >>> p = cPickler(stream, 1) >>> res = p.dump(mychain) Segmentation fault And now the same steps again using the pure Python Pickler: >>> import sys >>> from pickle import Pickler as pPickler >>> from cStringIO import StringIO >>> class rec: ... child = None ... def __init__(self, counter): ... if counter > 0: ... self.child = rec(counter-1) ... >>> sys.setrecursionlimit(20000) >>> mychain = rec(2600) >>> stream = StringIO() >>> p = pPickler(stream, 1) >>> p.dump(mychain) >>> len(stream.getvalue()) 48676 >>> ---------- components: Library (Lib) messages: 69532 nosy: esrever_otua severity: normal status: open title: cPickle segfault with deep recursion type: crash versions: Python 2.4 _______________________________________ Python tracker <[EMAIL PROTECTED]> <http://bugs.python.org/issue3338> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
