Description

serhiy-storchaka

opened on Aug 13, 2026

Issue body actions

Bug report

test_repr_lock starts the process P2, terminates it and never joins it, so it is still in multiprocessing.active_children() when the test ends:

$ ./python -m test --fail-env-changed test.test_multiprocessing_fork.test_processes -m test.test_multiprocessing_fork.test_processes.WithProcessesTestLock.test_repr_lock
Warning -- Dangling processes: {<Process name='P2' pid=3761884 parent=3761868 stopped exitcode=-SIGTERM>}
Result: ENV CHANGED

The same for the forkserver and spawn variants.

Running the whole file passes: the process is reaped before the environment is checked.

Linked PRs

• gh-155732: Join the terminated process in test_repr_lock #155734
• [3.15] gh-155732: Join the terminated process in test_repr_lock (GH-155734) #155766
• [3.14] gh-155732: Join the terminated process in test_repr_lock (GH-155734) #155767
• [3.13] gh-155732: Join the terminated process in test_repr_lock (GH-155734) #155768

Reacted by Duprat

Activity

1. serhiy-storchaka

   added

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   testsTests in the Lib/test dirTests in the Lib/test dir

   topic-multiprocessing

   3.13only security fixesonly security fixes

   3.14bugs and security fixesbugs and security fixes

   3.15bugs and security fixesbugs and security fixes

   3.16new features, bugs and security fixesnew features, bugs and security fixes

   on Aug 13, 2026
2. serhiy-storchaka

   added 2 commits that reference this issue on Aug 14, 2026

   gh-155732: Join the terminated process in test_repr_lock (GH-155734)

   3c414a5

   [3.14] gh-155732: Join the terminated process in test_repr_lock (GH-1…

   031cd30
3. serhiy-storchaka

   closed this as completedon Aug 14, 2026
4. mbeijen

   added a commit that references this issue on Aug 14, 2026

   pythongh-155732: Join the terminated process in test_repr_lock (pytho…

   1cca3fd
5. serhiy-storchaka

   added a commit that references this issue on Aug 15, 2026

   [3.13] gh-155732: Join the terminated process in test_repr_lock (GH-1…

   94a69e6
6. hugovk

   added a commit that references this issue on Aug 27, 2026

   [3.15] gh-155732: Join the terminated process in test_repr_lock (GH-1…

   bfa1595

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