aarch64 Fedora Stable Clang 3.10:
https://buildbot.python.org/all/#/builders/635/builds/253

0:00:23 load avg: 12.40 [404/427/1] test_ftplib failed (env changed)
Warning -- Uncaught thread exception: Exception
Exception in thread Thread-34:
Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-aarch64.clang/build/Lib/asyncore.py", line 90, in read
    obj.handle_read_event()
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-aarch64.clang/build/Lib/asyncore.py", line 427, in handle_read_event
    self.handle_read()
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-aarch64.clang/build/Lib/asynchat.py", line 179, in handle_read
    self.found_terminator()
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-aarch64.clang/build/Lib/test/test_ftplib.py", line 134, in found_terminator
    method(arg)
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-aarch64.clang/build/Lib/test/test_ftplib.py", line 159, in cmd_pasv
    conn, addr = sock.accept()
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-aarch64.clang/build/Lib/socket.py", line 293, in accept
    fd, addr = self._accept()
TimeoutError: timed out

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-aarch64.clang/build/Lib/threading.py", line 1009, in _bootstrap_inner
    self.run()
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-aarch64.clang/build/Lib/test/test_ftplib.py", line 297, in run
    asyncore.loop(timeout=0.1, count=1)
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-aarch64.clang/build/Lib/asyncore.py", line 214, in loop
    poll_fun(timeout, map)
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-aarch64.clang/build/Lib/asyncore.py", line 157, in poll
    read(obj)
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-aarch64.clang/build/Lib/asyncore.py", line 94, in read
    obj.handle_error()
  File "/home/buildbot/buildarea/3.10.cstratak-fedora-stable-aarch64.clang/build/Lib/test/test_ftplib.py", line 139, in handle_error
    raise Exception
Exception