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test_multiprocessing_spawn: test_interrupt() fails randomly #133744

@vstinner

Description

@vstinner

On a Free Threading build when tests are run in parallel (-F -j14) to stress the test:

vstinner@mona$ /opt/py314b1-ft/bin/python3.14td -m test test_multiprocessing_spawn.test_processes -W -m test_interrupt -F -j14
Using random seed: 1851856330
0:00:00 load avg: 1.58 Run tests in parallel using 14 worker processes
0:00:03 load avg: 1.58 [  1/1] test_multiprocessing_spawn.test_processes failed (1 failure)
test_interrupt (test.test_multiprocessing_spawn.test_processes.WithProcessesTestProcess.test_interrupt) ...

Traceback (most recent call last):
  File "<string>", line 1, in <module>
    from multiprocessing.spawn import spawn_main; spawn_main(tracker_fd=5, pipe_handle=7)
                                                  ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/py314b1-ft/lib/python3.14t/multiprocessing/spawn.py", line 122, in spawn_main
    exitcode = _main(fd, parent_sentinel)
  File "/opt/py314b1-ft/lib/python3.14t/multiprocessing/spawn.py", line 132, in _main
    self = reduction.pickle.load(from_parent)
  File "/opt/py314b1-ft/lib/python3.14t/test/test_multiprocessing_spawn/test_processes.py", line 2, in <module>
    from test._test_multiprocessing import install_tests_in_module_dict
  File "/opt/py314b1-ft/lib/python3.14t/test/_test_multiprocessing.py", line 53, in <module>
    import multiprocessing.managers
  File "/opt/py314b1-ft/lib/python3.14t/multiprocessing/managers.py", line 32, in <module>
    from . import pool
  File "<frozen importlib._bootstrap>", line 1371, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1342, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 938, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 758, in exec_module
  File "<frozen importlib._bootstrap_external>", line 891, in get_code
  File "<frozen importlib._bootstrap_external>", line 516, in _compile_bytecode
  File "<frozen importlib._bootstrap>", line 494, in _verbose_message
KeyboardInterrupt
FAIL

======================================================================
FAIL: test_interrupt (test.test_multiprocessing_spawn.test_processes.WithProcessesTestProcess.test_interrupt)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/opt/py314b1-ft/lib/python3.14t/test/_test_multiprocessing.py", line 578, in test_interrupt
    self.assertEqual(exitcode, 1)
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
AssertionError: -2 != 1

Python installed from the Python-3.14.0b1 tarball with:

$ ./configure --disable-gil --prefix /opt/py314b1-ft --with-pydebug
$ make
$ make install

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