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[3.13] gh-118981: multiprocessing.popen_spawn_posix, fix potential hang (gh-118982) #138606

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Merged
merged 1 commit into from
Sep 7, 2025
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[3.13] gh-118981: multiprocessing.popen_spawn_posix, fix potential hang (gh-118982) #138606

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4 changes: 4 additions & 0 deletions Lib/multiprocessing/popen_spawn_posix.py
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,10 @@ def _launch(self, process_obj):
self._fds.extend([child_r, child_w])
self.pid = util.spawnv_passfds(spawn.get_executable(),
cmd, self._fds)
os.close(child_r)
child_r = None
os.close(child_w)
child_w = None
self.sentinel = parent_r
with open(parent_w, 'wb', closefd=False) as f:
f.write(fp.getbuffer())
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2024-05-13-09-50-31.gh-issue-118981.zgOQPv.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix potential hang in ``multiprocessing.popen_spawn_posix`` that can happen
when the child proc dies early by closing the child fds right away.
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