[3.14] gh-138813: Fix mutable default kwargs={} in multiprocessing BaseProcess and DummyProcess to use None (GH-138814) #139084
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…eProcess and DummyProcess to use None (pythonGH-138814) * pythongh-138813: Default `BaseProcess` `kwargs` to `None` (pythonGH-138814) Set `BaseProcess.__init__(..., kwargs=None)` and initialize `kwargs` with `dict(kwargs) if kwargs else {}`. This avoids a shared mutable default and matches threading.Thread behavior. Co-authored-by: Dmitrii Chuprov <cheese@altlinux.org> * DummyProcess kwargs=None (which threading.Thread accepts properly) (cherry picked from commit 5a15e73) Co-authored-by: Denis Sergeev <newjimbatler00@gmail.com> Co-authored-by: Gregory P. Smith <greg@krypto.org>
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This was referenced Sep 17, 2025
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multiprocessing.dummy.DummyProcess.__init__#138813: DefaultBaseProcesskwargstoNone(gh-138813: Fix mutable default kwargs={} in multiprocessing BaseProcess and DummyProcess to use None #138814)Set
BaseProcess.__init__(..., kwargs=None)and initializekwargswithdict(kwargs) if kwargs else {}. This avoids a shared mutable default andmatches threading.Thread behavior.
Co-authored-by: Dmitrii Chuprov cheese@altlinux.org
(cherry picked from commit 5a15e73)
Co-authored-by: Denis Sergeev newjimbatler00@gmail.com
Co-authored-by: Gregory P. Smith greg@krypto.org