buildbot failure in Python on AMD64 FreeBSD CURRENT Debug 3.x

The Buildbot has detected a new failure on builder AMD64 FreeBSD CURRENT Debug 3.x while building python/cpython. Full details are available at: http://buildbot.python.org/all/builders/AMD64%20FreeBSD%20CURRENT%20Debug%20...
Buildbot URL: http://buildbot.python.org/all/
Buildslave for this Build: koobs-freebsd-current
Build Reason: The SingleBranchScheduler scheduler named '3.x' triggered this build Build Source Stamp: [branch master] d403a29c0055de6b03ed5ae7a5c564e1c95a5950 Blamelist: Victor Stinner <victor.stinner@gmail.com>
BUILD FAILED: failed test
Sincerely, -The Buildbot

https://bugs.python.org/issue31069#msg302061
test_wrapped_exception (test.test_multiprocessing_fork.WithThreadsTestPool) ... ok Warning -- Dangling threads: {<DummyProcess(Thread-158, started daemon 34496780800)>}
2017-09-13 13:40 GMT+02:00 <buildbot@python.org>:
The Buildbot has detected a new failure on builder AMD64 FreeBSD CURRENT Debug 3.x while building python/cpython. Full details are available at: http://buildbot.python.org/all/builders/AMD64%20FreeBSD%20CURRENT%20Debug%20...
Buildbot URL: http://buildbot.python.org/all/
Buildslave for this Build: koobs-freebsd-current
Build Reason: The SingleBranchScheduler scheduler named '3.x' triggered this build Build Source Stamp: [branch master] d403a29c0055de6b03ed5ae7a5c564e1c95a5950 Blamelist: Victor Stinner <victor.stinner@gmail.com>
BUILD FAILED: failed test
Sincerely, -The Buildbot
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Victor Stinner