The fix raised a new issue: #19565.

I also saw a crash on Windows which is probably related:

http://buildbot.python.org/all/builders/x86 Windows Server 2003 [SB] 3.x/builds/1717/steps/test/logs/stdio 

======================================================================
FAIL: test_4_daemon_threads (test.test_threading.ThreadJoinOnShutdown)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "E:\Data\buildslave\cpython\3.x.snakebite-win2k3r2sp2-x86\build\lib\test\test_threading.py", line 783, in test_4_daemon_threads
    rc, out, err = assert_python_ok('-c', script)
  File "E:\Data\buildslave\cpython\3.x.snakebite-win2k3r2sp2-x86\build\lib\test\script_helper.py", line 69, in assert_python_ok
    return _assert_python(True, *args, **env_vars)
  File "E:\Data\buildslave\cpython\3.x.snakebite-win2k3r2sp2-x86\build\lib\test\script_helper.py", line 55, in _assert_python
    "stderr follows:\n%s" % (rc, err.decode('ascii', 'ignore')))
AssertionError: Process return code is 3221225477, stderr follows:


----------------------------------------------------------------------