Gregory P. Smith 3a7df632c9 gh-146313: Fix multiprocessing ResourceTracker deadlock after os.fork() (GH-146316) ... `ResourceTracker.__del__` (added in gh-88887 circa Python 3.12) calls os.waitpid(pid, 0) which blocks indefinitely if a process created via os.fork() still holds the tracker pipe's write end. The tracker never sees EOF, never exits, and the parent hangs at interpreter shutdown. Fix with two layers: - **At-fork handler.** An os.register_at_fork(after_in_child=...) handler closes the inherited pipe fd in the child unless a preserve flag is set. popen_fork.Popen._launch() sets the flag before its fork so mp.Process(fork) children keep the fd and reuse the parent's tracker (preserving gh-80849). Raw os.fork() children close the fd, letting the parent reap promptly. - **Timeout safety-net.** _stop_locked() gains a wait_timeout parameter. When called from `__del__`, it polls with WNOHANG using exponential backoff for up to 1 second instead of blocking indefinitely. The at-fork handler makes this unreachable in well-behaved paths; it remains for abnormal shutdowns. Co-authored-by: Itamar Oren <itamarost@gmail.com>		2026-04-11 23:06:19 -07:00
..
dummy	gh-138813: Fix mutable default kwargs={} in multiprocessing BaseProcess and DummyProcess to use None (GH-138814)	2025-09-17 14:45:52 -07:00
__init__.py
connection.py	gh-145587: fix busy loop in multiprocessing.connection.wait on Windows (GH-145597)	2026-03-11 13:08:48 +01:00
context.py	gh-140814: Fix freeze_support() setting start method as side effect (GH-144608)	2026-03-15 22:50:19 -07:00
forkserver.py	gh-144503: Pass sys.argv to forkserver as real argv elements (GH-148194)	2026-04-06 22:41:02 -07:00
heap.py	gh-137928: remove redundant size validation in multiprocessing.heap (GH-137929)	2025-11-12 00:36:43 +00:00
managers.py	gh-115942: Add locked to several multiprocessing locks (#115944)	2025-04-08 11:14:12 +03:00
pool.py	gh-109649: Use os.process_cpu_count() (#110165)	2023-10-01 03:14:57 +02:00
popen_fork.py	gh-146313: Fix multiprocessing ResourceTracker deadlock after os.fork() (GH-146316)	2026-04-11 23:06:19 -07:00
popen_forkserver.py
popen_spawn_posix.py	gh-118981: multiprocessing.popen_spawn_posix, fix potential hang (gh-118982)	2025-09-07 07:18:28 +00:00
popen_spawn_win32.py	gh-118293: Suppress mouse cursor feedback when launching Windows processes with multiprocessing (GH-118315)	2024-04-28 21:10:44 +00:00
process.py	gh-138813: Fix mutable default kwargs={} in multiprocessing BaseProcess and DummyProcess to use None (GH-138814)	2025-09-17 14:45:52 -07:00
queues.py	gh-133146: Add the old public get_value method to documentation and refactor code. (GH-133301)	2025-11-29 22:12:48 +00:00
reduction.py	gh-97514: Authenticate the forkserver control socket. (GH-99309)	2024-11-20 08:18:58 -08:00
resource_sharer.py	gh-101225: Increase the socket backlog when creating a multiprocessing.connection.Listener (#113567)	2024-01-13 10:48:33 +01:00
resource_tracker.py	gh-146313: Fix multiprocessing ResourceTracker deadlock after os.fork() (GH-146316)	2026-04-11 23:06:19 -07:00
shared_memory.py	gh-121288: Make error message for index() methods consistent (GH-121395)	2024-07-05 10:50:45 -07:00
sharedctypes.py	gh-133017: Improve error message for invalid typecodes in multiprocessing.{Array,Value} (GH-133252)	2025-05-09 11:46:45 +03:00
spawn.py	gh-109263: Start process from spawn context in multiprocessing no longer have side effect (GH-135813)	2025-12-23 19:28:32 +00:00
synchronize.py	gh-133146: Add the old public get_value method to documentation and refactor code. (GH-133301)	2025-11-29 22:12:48 +00:00
util.py	gh-140734: fix off-by-one error when comparing to _SUN_PATH_MAX (#140903)	2025-11-07 09:54:02 +00:00