buildbot failure in Python on x86 Gentoo Refleaks 3.x

The Buildbot has detected a new failure on builder x86 Gentoo Refleaks 3.x while building Python. Full details are available at: http://buildbot.python.org/all/builders/x86%20Gentoo%20Refleaks%203.x/builds...
Buildbot URL: http://buildbot.python.org/all/
Buildslave for this Build: ware-gentoo-x86
Build Reason: The Nightly scheduler named '3.x-daily' triggered this build Build Source Stamp: [branch master] HEAD Blamelist:
BUILD FAILED: failed test
Sincerely, -The Buildbot

2:25:32 load avg: 6.48 [287/405/1] test_threading failed (env changed) (142 sec) -- running: test_multiprocessing_spawn (1590 sec) beginning 6 repetitions 123456 ..Warning -- threading_cleanup() failed to cleanup 1 threads (count: 1, dangling: 1)
=> https://bugs.python.org/issue31234
2017-09-14 5:53 GMT+02:00 <buildbot@python.org>:
The Buildbot has detected a new failure on builder x86 Gentoo Refleaks 3.x while building Python. Full details are available at: http://buildbot.python.org/all/builders/x86%20Gentoo%20Refleaks%203.x/builds...
Buildbot URL: http://buildbot.python.org/all/
Buildslave for this Build: ware-gentoo-x86
Build Reason: The Nightly scheduler named '3.x-daily' triggered this build Build Source Stamp: [branch master] HEAD Blamelist:
BUILD FAILED: failed test
Sincerely, -The Buildbot
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Victor Stinner