[ python-Bugs-840829 ] weakref callbacks and gc corrupt memory

[SourceForge.net]

Bugs item #840829, was opened at 2003-11-12 18:05
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=840829&group_id=5470

Category: Python Interpreter Core
Group: Python 2.3
Status: Open
Resolution: None
Priority: 5
Submitted By: Thomas Heller (theller)
Assigned to: Nobody/Anonymous (nobody)
Summary: weakref callbacks and gc corrupt memory

Initial Comment:
This program crashes the Python interpreter in a debug
build, and probably corrupts memory in release build
(on Windows, at least):

"""
import weakref
import gc

_boundMethods = weakref.WeakKeyDictionary()

def safeRef(object):
    selfkey = object.im_self
    funckey = object.im_func
    _boundMethods[selfkey] = weakref.WeakKeyDictionary()
    _boundMethods[selfkey][funckey] =
BoundMethodWeakref(object)

class BoundMethodWeakref:
    def __init__(self, boundMethod):
        def remove(object):
            gc.collect()
        self.weakSelf =
weakref.ref(boundMethod.im_self, remove)

class X(object):
    def test(self):
        pass

def test():
    print "A"
    safeRef(X().test)
    print "B"

if __name__ == "__main__":
    test()
"""

See also these messages:

http://mail.python.org/pipermail/python-dev/2003-November/040189.html

http://mail.python.org/pipermail/python-dev/2003-November/040191.html


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=840829&group_id=5470