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[3.14] gh-143706: Fix sys.argv not set during multiprocessing forkserver`main` preload (GH-143717)#143763

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Merged

gpshead merged 1 commit intopython:3.14frommiss-islington:backport-298d544-3.14

Jan 13, 2026

Merged

[3.14] gh-143706: Fix sys.argv not set during multiprocessing forkserver`main` preload (GH-143717)#143763

gpshead merged 1 commit intopython:3.14frommiss-islington:backport-298d544-3.14

Jan 13, 2026

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miss-islington commentedJan 12, 2026•
edited by bedevere-appbot
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The forkserver was not passing sys.argv to its main() function, causing
sys.argv to be empty during__main__ module import in child processes. This
fixes a non-obvious regression inadvertently introduced by thegh-126631 main
preloading fix.
(cherry picked from commit298d544)

Co-authored-by: Gregory P. Smith68491+gpshead@users.noreply.github.com

Issue:sys.argv no longer correct during main module execution usingforkserver #143706

pythongh-143706: Fix sys.argv not set during multiprocessing forkserv…

268bf07

…er `__main__` preload (pythonGH-143717)The forkserver was not passing sys.argv to its main() function, causingsys.argv to be empty during `__main__` module import in child processes. Thisfixes a non-obvious regression inadvertently introduced by thepythongh-126631 mainpreloading fix.(cherry picked from commit298d544)Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com>