[issue43944] Processes in Python 3.9 exiting with code 1 when It's created inside a ThreadPoolExecutor

Thomas Grainger added the comment: the problem is multiprocessing/process is calling threading._shutdown which tries to join its own thread, because concurrent.futures.thread._threads_queues contains the main thread in the subprocess File

[issue43944] Processes in Python 3.9 exiting with code 1 when It's created inside a ThreadPoolExecutor

Jack DeVries added the comment: The first bad commit was a fix for bpo-39812. -- ___ Python tracker ___ ___ Python-bugs-list

[issue43944] Processes in Python 3.9 exiting with code 1 when It's created inside a ThreadPoolExecutor

Jack DeVries added the comment: I've identified the first bad commit with git-bisect: commit b61b818d916942aad1f8f3e33181801c4a1ed14b Author: Kyle Stanley Date: Fri Mar 27 15:31:22 2020 -0400 bpo-39812: Remove daemon threads in concurrent.futures (GH-19149) Remove daemon threads

[issue43944] Processes in Python 3.9 exiting with code 1 when It's created inside a ThreadPoolExecutor

Genaro Camele added the comment: Hi @jack__d, thanks for your answer and time. Unfortunately, It's still a regression, as in Python < 3.9 my example works as expected -- ___ Python tracker

[issue43944] Processes in Python 3.9 exiting with code 1 when It's created inside a ThreadPoolExecutor

Jack DeVries added the comment: Ah never mind. @Genarito, the ThreadPoolExecutor is supposed to be used as a context manager. In your current code, the script ends and Python starts tearing itself down while `execute_error` is still running in a subprocess. If you simply use the

[issue43944] Processes in Python 3.9 exiting with code 1 when It's created inside a ThreadPoolExecutor

Jack DeVries added the comment: I am working on a fix for this bug. I'm a beginner cpython contributor, so if anyone recognizes this as a fool's errand, please let me know! -- nosy: +jack__d ___ Python tracker

[issue43944] Processes in Python 3.9 exiting with code 1 when It's created inside a ThreadPoolExecutor

Alexandre Sicard added the comment: Thank you very much for this report, Genaro. I encountered the same bug with a Process running in the context of a Django view. Downgrading to Python 3.8 also fixed the issue for me. Versions: python:3.9-alpine Docker image, running Python 3.9.5 and

[issue43944] Processes in Python 3.9 exiting with code 1 when It's created inside a ThreadPoolExecutor

Change by Terry J. Reedy : -- nosy: +davin, pitrou ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe:

[issue43944] Processes in Python 3.9 exiting with code 1 when It's created inside a ThreadPoolExecutor

New submission from Genaro Camele : I've a piece of code that submits a task to a [ThreadPoolExecutor][1] which starts a [Process][2]. I've realised that in Python 3.8 that Process finished with exit code `0`. But I've updated Python to the 3.9 version and this started to finishing with exit