[pull] main from python:main#675
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pull[bot] merged 3 commits intotj-python:mainfrom Jan 18, 2026
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…er_preload` (GH-141859) Add a keyword-only `on_error` parameter to `multiprocessing.set_forkserver_preload()`. This allows the user to have exceptions during optional `forkserver` start method module preloading cause the forkserver subprocess to warn (generally to stderr) or exit with an error (preventing use of the forkserver) instead of being silently ignored. This _also_ fixes an oversight, errors when preloading a `__main__` module are now treated the similarly. Those would always raise unlike other modules in preload, but that had gone unnoticed as up until bug fix PR GH-135295 in 3.14.1 and 3.13.8, the `__main__` module was never actually preloaded. Based on original work by Nick Neumann @aggieNick02 in GH-99515.
Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
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