[New-bugs-announce] [issue8022] Leak when creating certain classes that subclass ABCs

[Daniel Stutzbach]

New submission from Daniel Stutzbach <daniel at stutzbachenterprises.com>:

Attached is a minimal example.  It has a function called leak().  The end of the script calls that function, runs the garbage collector, and prints out the number of objects in the system.  In Python 2.6, the number of objects increases after each iteration of the loop.  In Python 3.1, the number of objects remains fixed after the second iteration.  I don't have a Python 2.7 branch handy to test.

The problem could lie in the C code or perhaps ABCMeta is keeping a reference?  I'm not sure.

Cashew:~$ python2.6 leak.py
4842
4850
4858
4866
4874
4882
4890
4898
4906
4914

Cashew:~$ python3.1 leak.py
4286
4273
4273
4273
4273
4273
4273
4273
4273
4273

----------
components: Interpreter Core, Library (Lib)
files: leak.py
messages: 100132
nosy: stutzbach
severity: normal
status: open
title: Leak when creating certain classes that subclass ABCs
type: resource usage
versions: Python 2.6
Added file: http://bugs.python.org/file16374/leak.py

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<http://bugs.python.org/issue8022>
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