taskflow-5.0.0 fails on FreeBSD: Bad file descriptor

[Yuri]

This example https://opendev.org/openstack/taskflow/src/branch/master//taskflow/examples/hello_world.py fails with taskflow-5.0.0 on FreeBSD 13.1:

-- Running in parallel using threads --
*ding*
joe@hello: hellooo
sue@hello: helloooooo!
bob@hello: hello
bob@world: world
joe@world: worllllld
sue@world: wooorllld!
*dong*
-- Running in parallel using processes --
*ding*
joe@hello: hellooo
sue@hello: helloooooo!
bob@hello: hello
bob@world: world
joe@world: worllllld
sue@world: wooorllld!
*dong*
Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/threading.py", line 932, in _bootstrap_inner
    self.run()
  File "/usr/local/lib/python3.8/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/lib/python3.8/asyncore.py", line 203, in loop
    poll_fun(timeout, map)
  File "/usr/local/lib/python3.8/asyncore.py", line 144, in poll
    r, w, e = select.select(r, w, e, timeout)
OSError: [Errno 9] Bad file descriptor
-- Running serially --
*ding*
joe@hello: hellooo
sue@hello: helloooooo!
bob@hello: hello
bob@world: world
joe@world: worllllld
sue@world: wooorllld!
*dong*
-- Statistics gathered --