New submission from Jorge Herskovic:
I'm writing a library on top of multiprocessing. As part of the test suite, I
create and destroy dozens of processes repeatedly. About once in 50 runs, the
tests complete successfully but the program crashes with:
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
File
"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/multiprocessing/util.py",
line 286, in _exit_function
_run_finalizers(0)
File
"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/multiprocessing/util.py",
line 246, in _run_finalizers
items = [x for x in list(_finalizer_registry.items()) if f(x)]
RuntimeError: dictionary changed size during iteration
(this is on OS X 10.10.3, Python 3.4.3; I've been unable to replicate the
behavior on Python 2.7.9, 3.5.0b2, or pypy despite hundreds of runs)
The problematic code is available at https://github.com/jherskovic/mpetl and
the tests should be run with nosetests
----------
components: Library (Lib)
messages: 245597
nosy: Jorge Herskovic
priority: normal
severity: normal
status: open
title: multiprocessing cleanup occasionally throws exception
type: crash
versions: Python 3.4
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Python tracker <[email protected]>
<http://bugs.python.org/issue24484>
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