[issue41714] multiprocessing.Queue deadlock

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[issue41714] multiprocessing.Queue deadlock

Richard Purdie added the comment: Even my hack to call _writer.close() doesn't seem to be enough, it makes the problem rarer but there is still an issue. Basically, if you call cancel_join_thread() in one process, the queue is potentially totally broken in all other processes that may be usi

[issue41714] multiprocessing.Queue deadlock

Richard Purdie added the comment: I should also add that if we don't use cancel_join_thread() in the parser processes, things all work out ok. There is therefore seemingly something odd about the state that is leaving things in. This issue doesn't occur every time, its maybe 1 in 40 runs wher

[issue41714] multiprocessing.Queue deadlock

New submission from Richard Purdie : We're having some problems with multiprocessing.Queue where the parent process ends up hanging with zombie children. The code is part of bitbake, the task execution engine behind OpenEmbedded/Yocto Project. I've cut down our code to the pieces in question