x86 Gentoo Installed with X 3.x:
https://buildbot.python.org/all/#/builders/128/builds/726

test_del_shutdown (test.test_concurrent_futures.ProcessPoolSpawnProcessPoolShutdownTest) ...

Warning -- Unraisable exception
Exception ignored in: <function _ExecutorManagerThread.__init__.<locals>.weakref_cb at 0xb5067898>
Traceback (most recent call last):
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/concurrent/futures/process.py", line 281, in weakref_cb
    thread_wakeup.wakeup()
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/concurrent/futures/process.py", line 80, in wakeup
    self._writer.send_bytes(b"")
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/multiprocessing/connection.py", line 205, in send_bytes
    self._send_bytes(m[offset:offset + size])
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/multiprocessing/connection.py", line 416, in _send_bytes
    self._send(header + buf)
  File "/buildbot/buildarea/cpython/3.x.ware-gentoo-x86.installed/build/target/lib/python3.9/multiprocessing/connection.py", line 373, in _send
    n = write(self._handle, buf)
OSError: [Errno 9] Bad file descriptor

0.04s ok