[Python-bugs-list] [ python-Bugs-742911 ] Memory fault on complex weakref/weakkeydict delete

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Bugs item #742911, was opened at 2003-05-24 18:29
Message generated for change (Comment added) made by nnorwitz
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Category: Python Interpreter Core
Group: Python 2.2.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Mike C. Fletcher (mcfletch)
Assigned to: Nobody/Anonymous (nobody)
Summary: Memory fault on complex weakref/weakkeydict delete

Initial Comment:
Attached find two modules which together form a
test-case.  The cache.py file is ripped out of a
production system (OpenGLContext), and I am seeing
memory faults under both Python 2.2.2 and 2.2.3 when I
run the code.  Under 2.2.2 while single-stepping
through the code I was able to provoke an error-message:

Fatal Python error: GC object already in linked list

The error message doesn't show up under 2.2.3, but the
memory-fault does.

Modules here don't use any extension modules, so there
shouldn't be any loose memory references or the like. 
Note, you'll likely need to make weakkeydictionary's
__delitem__ use keys instead of iterkeys to even get to
the crashing.

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>Comment By: Neal Norwitz (nnorwitz)
Date: 2003-05-24 19:31

Message:
Logged In: YES 
user_id=33168

I cut out a lot of stuff from the test.  The new file is
much more minimal, but still crashes for me in a 2.3 debug
build.  You only need the one file too (not both files).

There is an issue with new style classes.  If Items doesn't
derive from object, I don't get a crash.

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