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multiprocessing.Queue: Exceeding a certain amount of bytes in the queue prevents proper exit #128186

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3.12only security fixes3.13bugs and security fixes3.14bugs and security fixesextension-modulesC modules in the Modules dirtopic-multiprocessingtype-bugAn unexpected behavior, bug, or error
@ebonnal

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@ebonnal

Bug report

Bug description:

This terminates properly:

frommultiprocessingimportQueueQueue().put(b"0"*65514)print("end")

while this prints 'end' and is then stuck:

frommultiprocessingimportQueueQueue().put(b"0"*65515)print("end")

CPython versions tested on:

Latest identified version without the issue: 3.9.6
Oldest identified version with the issue: 3.9.18

Operating systems tested on:

Linux, macOS

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3.12only security fixes3.13bugs and security fixes3.14bugs and security fixesextension-modulesC modules in the Modules dirtopic-multiprocessingtype-bugAn unexpected behavior, bug, or error

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