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bpo-46787: Fix ProcessPoolExecutor exception memory leak (GH-31408) (#31408)

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Do not store `ProcessPoolExecutor` work item exception traceback that prevents
exception frame locals from being garbage collected.
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themylogin 2022-05-02 22:24:39 +02:00 committed by GitHub
parent c96da83a8e
commit 9c204b148f
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2 changed files with 4 additions and 0 deletions
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3
Lib/concurrent/futures/process.py
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@ -125,6 +125,9 @@ class _ExceptionWithTraceback:
def __init__(self, exc, tb):
tb = ''.join(format_exception(type(exc), exc, tb))
self.exc = exc
# Traceback object needs to be garbage-collected as its frames
# contain references to all the objects in the exception scope
self.exc.__traceback__ = None
self.tb = '\n"""\n%s"""' % tb
def __reduce__(self):
return _rebuild_exc, (self.exc, self.tb)

1
Misc/NEWS.d/next/Library/2022-02-18-20-09-29.bpo-46787.juwWc0.rst Normal file
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@ -0,0 +1 @@
Fix :class:`concurrent.futures.ProcessPoolExecutor` exception memory leak