Irit Katriel <iritkatr...@gmail.com> added the comment:

Which python version and system are you seeing this on?

On 3.11 on a Mac I don't get a segfault but rather 

Process SpawnProcess-1:
Traceback (most recent call last):
  File "/Users/iritkatriel/src/cpython/Lib/multiprocessing/process.py", line 
315, in _bootstrap
    self.run()
    ^^^^^^^^^^
  File "/Users/iritkatriel/src/cpython/Lib/multiprocessing/process.py", line 
108, in run
    self._target(*self._args, **self._kwargs)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/iritkatriel/src/cpython/tt.py", line 6, in wait_for_event
    while not event.is_set():
              ^^^^^^^^^^^^^^
  File "/Users/iritkatriel/src/cpython/Lib/multiprocessing/synchronize.py", 
line 328, in is_set
    with self._cond:
    ^^^^^^^^^^^^^^^^
  File "/Users/iritkatriel/src/cpython/Lib/multiprocessing/synchronize.py", 
line 230, in __enter__
    return self._lock.__enter__()
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/iritkatriel/src/cpython/Lib/multiprocessing/synchronize.py", 
line 95, in __enter__
    return self._semlock.__enter__()
           ^^^^^^^^^^^^^^^^^^^^^^^^^
OSError: [Errno 9] Bad file descriptor
<SpawnProcess name='SpawnProcess-1' pid=29612 parent=29610 stopped exitcode=1>

----------
nosy: +iritkatriel

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45298>
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