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[3.9] bpo-46787: Fix ProcessPoolExecutor exception memory leak (GH-31408) (GH-31408) #92188

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Merged
miss-islington merged 1 commit into from
May 2, 2022
Merged

[3.9] bpo-46787: Fix ProcessPoolExecutor exception memory leak (GH-31408) (GH-31408) #92188

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

Do not store `ProcessPoolExecutor` work item exception traceback that prevents
exception frame locals from being garbage collected.
(cherry picked from commit 9c204b1)

Co-authored-by: themylogin <themylogin@gmail.com>
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@themylogin @miss-islington
themylogin authored and miss-islington committed May 2, 2022
commit f5457e286a442b835b36291417424103c6fb9392
3 changes: 3 additions & 0 deletions Lib/concurrent/futures/process.py
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Expand Up @@ -126,6 +126,9 @@ def __init__(self, exc, tb):
tb = traceback.format_exception(type(exc), exc, tb)
tb = ''.join(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)
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2022-02-18-20-09-29.bpo-46787.juwWc0.rst
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@@ -0,0 +1 @@
Fix :class:`concurrent.futures.ProcessPoolExecutor` exception memory leak