[issue37901] 21 tests fail when run on an IPv6-only host

[Gregory P. Smith]

New submission from Gregory P. Smith <greg at krypto.org>:

21 tests failed:
    test_asynchat test_asyncore test_docxmlrpc test_eintr test_epoll
    test_ftplib test_httplib test_imaplib
    test_multiprocessing_forkserver test_multiprocessing_spawn
    test_nntplib test_os test_poplib test_robotparser test_smtplib
    test_socket test_ssl test_support test_telnetlib
    test_urllib2_localnet test_wsgiref

This is a rollup tracking issue.  I've got an IPv6-only future buildbot host with which to run an diagnose these for fixes.  Of note there is no IPv4 localhost.

If there are larger problems I may spawn child bugs for specific issues off of this one.  (I already filed separate issues about 5 other tests that hang rather than fail)

----------
assignee: gregory.p.smith
components: Tests
messages: 350039
nosy: gregory.p.smith
priority: normal
severity: normal
stage: needs patch
status: open
title: 21 tests fail when run on an IPv6-only host
type: behavior
versions: Python 3.7, Python 3.8, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37901>
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