New submission from Lysandros Nikolaou <lisandros...@gmail.com>:

On my Mac OS X 10.13.6 system test_socket.test_host_resolution_bad_address 
fails with the following error:

======================================================================
FAIL: test_host_resolution_bad_address (test.test_socket.GeneralModuleTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/path/to/cpython/Lib/test/test_socket.py", line 897, in 
test_host_resolution_bad_address
    socket.gethostbyname(addr)
AssertionError: OSError not raised : 0.1.1.~1

----------------------------------------------------------------------
Ran 555 tests in 24.950s

FAILED (failures=1, skipped=141)
/path/to/cpython/Lib/test/test_socket.py:2345: RuntimeWarning: received 
malformed or improperly-truncated ancillary data
  result = sock.recvmsg(bufsize, *args)
/path/to/cpython/Lib/test/test_socket.py:2436: RuntimeWarning: received 
malformed or improperly-truncated ancillary data
  result = sock.recvmsg_into([buf], *args)
test test_socket failed

== Tests result: FAILURE ==

1 test failed:
    test_socket

Total duration: 25 sec 423 ms
Tests result: FAILURE

When I manually run socket.gethostbyname('0.1.1.~1'), it returns an IP address, 
no exception thrown.

----------
components: Tests
messages: 321575
nosy: lys.nikolaou
priority: normal
severity: normal
status: open
title: test_socket.test_host_resolution_bad_address fails on Mac OS X 10.13.6
type: behavior
versions: Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34105>
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