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[3.12] gh-94777: Fix deadlock in ProcessPoolExecutor (GH-94784) (#106609)

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gh-94777: Fix deadlock in ProcessPoolExecutor (GH-94784)

Fixes a hang in multiprocessing process pool executor when a child process crashes and code could otherwise block on writing to the pipe.  See GH-94777 for more details.
(cherry picked from commit 6782fc0502)

Co-authored-by: Louis Paulot <55740424+lpaulot@users.noreply.github.com>
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Miss Islington (bot) 2023-07-10 15:49:07 -07:00 • committed by GitHub
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Lib/concurrent/futures/process.py
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@ -499,6 +499,10 @@ class _ExecutorManagerThread(threading.Thread):
for p in self.processes.values():
p.terminate()
# Prevent queue writing to a pipe which is no longer read.
# https://github.com/python/cpython/issues/94777
self.call_queue._reader.close()
# clean up resources
self.join_executor_internals()