Random error seen on FreeBSD:

0:05:54 load avg: 5.75 [340/427/1] test_logging passed -- running: test_pydoc (34.4 sec)

Exception in thread Thread-25 (serve_forever):
Traceback (most recent call last):
  File "/usr/home/vstinner/python/master/Lib/threading.py", line 990, in _bootstrap_inner
    self.run()
  File "/usr/home/vstinner/python/master/Lib/threading.py", line 928, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/home/vstinner/python/master/Lib/test/test_logging.py", line 863, in serve_forever
    asyncore.loop(poll_interval, map=self._map)
  File "/usr/home/vstinner/python/master/Lib/asyncore.py", line 203, in loop
    poll_fun(timeout, map)
  File "/usr/home/vstinner/python/master/Lib/asyncore.py", line 144, in poll
    r, w, e = select.select(r, w, e, timeout)
OSError: [Errno 9] Bad file descriptor