Buildbot failure in Python on AMD64 Windows8.1 Refleaks 3.6

The Buildbot has detected a new failure on builder AMD64 Windows8.1 Refleaks 3.6 while building Python. Full details are available at: http://buildbot.python.org/all/#builders/64/builds/20
Buildbot URL: http://buildbot.python.org/all/
Worker for this Build: ware-win81-release
Build Reason: <unknown> Blamelist:
BUILD FAILED: failed test (failure)
Sincerely, -The Buildbot

Hum, a test failed twice, but I'm unable to reproduce the bug:
test_contextlib leaked [1, 1, 8] memory blocks, sum=10 (...) test_contextlib leaked [8, 1, 1] memory blocks, sum=10
Victor
2017-10-27 7:18 GMT+02:00 <buildbot@python.org>:
The Buildbot has detected a new failure on builder AMD64 Windows8.1 Refleaks 3.6 while building Python. Full details are available at: http://buildbot.python.org/all/#builders/64/builds/20
Buildbot URL: http://buildbot.python.org/all/
Worker for this Build: ware-win81-release
Build Reason: <unknown> Blamelist:
BUILD FAILED: failed test (failure)
Sincerely, -The Buildbot
Buildbot-status mailing list buildbot-status@python.org https://mail.python.org/mm3/mailman3/lists/buildbot-status.python.org/
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Victor Stinner