STINNER Victor <vstin...@python.org> added the comment:

ERROR: test_killed_child 
(test.test_concurrent_futures.ProcessPoolSpawnProcessPoolExecutorTest)
  (...)
  File 
"/home/buildbot/buildarea/3.x.cstratak-fedora-stable-x86_64.clang-installed/build/target/lib/python3.9/multiprocessing/connection.py",
 line 373, in _send
    n = write(self._handle, buf)
OSError: [Errno 9] Bad file descriptor

It seems like Connection.close() was called while Connection._send() was 
called. I added debug logs:

* self._handle was equal to 4 at the function entry
* self._handle was equal to None when write() was called

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39995>
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