Anthony Sottile <> added the comment:

Seeing this as well when running the cpython test suite in docker:

$ ./python -m test.test_asyncio


[18 similar traces omitted]
ERROR: test_sock_sendfile_zero_size 
Traceback (most recent call last):
  File "/code/Lib/test/test_asyncio/", line 559, in 
    sock, proto = self.prepare()
  File "/code/Lib/test/test_asyncio/", line 483, in prepare
    lambda: proto, support.HOST, port))
  File "/code/Lib/test/test_asyncio/", line 476, in run_loop
    return self.loop.run_until_complete(coro)
  File "/code/Lib/asyncio/", line 566, in run_until_complete
    return future.result()
  File "/code/Lib/asyncio/", line 1346, in create_server
    % (sa, err.strerror.lower())) from None
OSError: [Errno 99] error while attempting to bind on address ('::1', 39527, 0, 
0): cannot assign requested address



I'm going to try and write a patch to skip these tests (there's already a 

nosy: +Anthony Sottile

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