[BUG]: Test test_run_in_process_multiple_threads_sequential fails

[yurivict]

Required prerequisites

• Make sure you've read the documentation. Your issue may be addressed there.
• Search the issue tracker and Discussions to verify that this hasn't already been reported. +1 or comment there if it has.
• Consider asking first in the Gitter chat room or in a Discussion.

What version (or hash if on master) of pybind11 are you using?

2.10.2

Problem description

__________________________________________________ test_run_in_process_multiple_threads_sequential[test_multi_acquire_release_cross_module] __________________________________________________

test_fn = <function test_multi_acquire_release_cross_module at 0x8cbf75280>

    @pytest.mark.parametrize("test_fn", ALL_BASIC_TESTS_PLUS_INTENTIONAL_DEADLOCK)
    def test_run_in_process_multiple_threads_sequential(test_fn):
        """Makes sure there is no GIL deadlock when running in a thread multiple times sequentially.
    
        It runs in a separate process to be able to stop and assert if it deadlocks.
        """
>       assert _run_in_process(_run_in_threads, test_fn, num_threads=8, parallel=False) == 0

test_fn    = <function test_multi_acquire_release_cross_module at 0x8cbf75280>

../../pybind11-2.10.2/tests/test_gil_scoped.py:234: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

target = <function _run_in_threads at 0x8cbf754c0>, args = (<function test_multi_acquire_release_cross_module at 0x8cbf75280>,), kwargs = {'num_threads': 8, 'parallel': False}
test_fn = <function test_multi_acquire_release_cross_module at 0x8cbf75280>, timeout = 10, process = <Process name='Process-53' pid=32667 parent=30786 stopped exitcode=-SIGTERM daemon>
t_start = 1671766594.3010159, t_delta = 10.004453420639038, @py_assert1 = None

    def _run_in_process(target, *args, **kwargs):
        if len(args) == 0:
            test_fn = target
        else:
            test_fn = args[0]
        # Do not need to wait much, 10s should be more than enough.
        timeout = 0.1 if test_fn is _intentional_deadlock else 10
        process = multiprocessing.Process(target=target, args=args, kwargs=kwargs)
        process.daemon = True
        try:
            t_start = time.time()
            process.start()
            if timeout >= 100:  # For debugging.
                print(
                    "\nprocess.pid STARTED", process.pid, (sys.argv, target, args, kwargs)
                )
                print(f"COPY-PASTE-THIS: gdb {sys.argv[0]} -p {process.pid}", flush=True)
            process.join(timeout=timeout)
            if timeout >= 100:
                print("\nprocess.pid JOINED", process.pid, flush=True)
            t_delta = time.time() - t_start
            if process.exitcode == 66 and m.defined_THREAD_SANITIZER:  # Issue #2754
                # WOULD-BE-NICE-TO-HAVE: Check that the message below is actually in the output.
                # Maybe this could work:
                # https://gist.github.com/alexeygrigorev/01ce847f2e721b513b42ea4a6c96905e
                pytest.skip(
                    "ThreadSanitizer: starting new threads after multi-threaded fork is not supported."
                )
            elif test_fn is _intentional_deadlock:
                assert process.exitcode is None
                return 0
            elif process.exitcode is None:
                assert t_delta > 0.9 * timeout
                msg = "DEADLOCK, most likely, exactly what this test is meant to detect."
                if env.PYPY and env.WIN:
                    pytest.skip(msg)
>               raise RuntimeError(msg)
E               RuntimeError: DEADLOCK, most likely, exactly what this test is meant to detect.

args       = (<function test_multi_acquire_release_cross_module at 0x8cbf75280>,)
kwargs     = {'num_threads': 8, 'parallel': False}
msg        = 'DEADLOCK, most likely, exactly what this test is meant to detect.'
process    = <Process name='Process-53' pid=32667 parent=30786 stopped exitcode=-SIGTERM daemon>
t_delta    = 10.004453420639038
t_start    = 1671766594.3010159
target     = <function _run_in_threads at 0x8cbf754c0>
test_fn    = <function test_multi_acquire_release_cross_module at 0x8cbf75280>
timeout    = 10

../../pybind11-2.10.2/tests/test_gil_scoped.py:186: RuntimeError
================================================================================== short test summary info ===================================================================================
SKIPPED [1] ../../pybind11-2.10.2/tests/test_builtin_casters.py:145: no <string_view>
SKIPPED [1] ../../pybind11-2.10.2/tests/test_callbacks.py:203: Current PYBIND11_INTERNALS_VERSION too low
SKIPPED [1] ../../pybind11-2.10.2/tests/test_copy_move.py:77: no <optional>
SKIPPED [1] ../../pybind11-2.10.2/tests/test_pytypes.py:397: Not defined: PYBIND11_HANDLE_REF_DEBUG
SKIPPED [1] ../../pybind11-2.10.2/tests/test_sequences_and_iterators.py:13: no <optional>
SKIPPED [1] ../../pybind11-2.10.2/tests/test_stl.py:111: no <optional>
SKIPPED [1] ../../pybind11-2.10.2/tests/test_stl.py:143: no <experimental/optional>
SKIPPED [1] ../../pybind11-2.10.2/tests/test_stl.py:234: no <filesystem>
SKIPPED [1] ../../pybind11-2.10.2/tests/test_stl.py:270: no std::monostate
FAILED ../../pybind11-2.10.2/tests/test_exceptions.py::test_cross_module_exception_translator - RuntimeError
FAILED ../../pybind11-2.10.2/tests/test_gil_scoped.py::test_run_in_process_multiple_threads_sequential[test_multi_acquire_release_cross_module] - RuntimeError: DEADLOCK, most likely, exactly what this test is meant to detect.
==================================================================== 2 failed, 780 passed, 9 skipped in 151.14s (0:02:31) ====================================================================

Reproducible example code

No response

Is this a regression? Put the last known working version here if it is.

Not a regression