New submission from João Eiras <[email protected]>:
Hi.
When one of the processes in a multiprocessing.pool picks up a task then then
somehow crashes (and by crash I mean crashing the python process with something
like a SEGV) or is killed, the pool in the main process will notice one of the
workers died and will repopulate the pool, but it does not keep track which
task was being handled by the process that died. As consequence, a caller
waiting for a result will get stuck forever.
Example:
with multiprocessing.Pool(1) as pool:
result = pool.map_async(os._exit, [1]).get(timeout=2)
I found this because I was trying to use a lock with a spawned process on linux
and that caused a crash and my program froze, but that is another issue.
----------
components: Extension Modules
messages: 362651
nosy: João Eiras
priority: normal
severity: normal
status: open
title: multiprocessing halts when child process crashes/quits
type: behavior
versions: Python 3.8
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Python tracker <[email protected]>
<https://bugs.python.org/issue39752>
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