test__xxsubinterpreters and test_interpreters failed on AMD64 FreeBSD Shared 3.x:
https://buildbot.python.org/all/#/builders/152/builds/973
See also bpo-37224: "[subinterpreters] test__xxsubinterpreters fails randomly".
IMO there are multiple race conditions in these tests.
======================================================================
FAIL: test_subinterpreter (test.test__xxsubinterpreters.IsRunningTests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/test/test__xxsubinterpreters.py", line 478, in test_subinterpreter
self.assertTrue(interpreters.is_running(interp))
AssertionError: False is not true
======================================================================
FAIL: test_still_running (test.test_interpreters.TestInterpreterDestroy)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/test/test_interpreters.py", line 309, in test_still_running
interp.close()
AssertionError: RuntimeError not raised
======================================================================
FAIL: test_subinterpreter (test.test_interpreters.TestInterpreterIsRunning)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/test/test_interpreters.py", line 207, in test_subinterpreter
self.assertTrue(interp.is_running())
AssertionError: False is not true
======================================================================
FAIL: test_already_running (test.test_interpreters.TestInterpreterRun)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/usr/home/buildbot/python/3.x.koobs-freebsd-564d/build/Lib/test/test_interpreters.py", line 383, in test_already_running
self.interp.run('print("spam")')
AssertionError: RuntimeError not raised