INADA Naoki added the comment:
This script can cause deadlock on Python 3.6.
1. Other threads can register traceback to sys module after sys module dict is
cleaned up.
2. In Py_Finalize, __del__ method of arbitrary object in the traceback can be
called.
3. The __del__ method calls threading.Thread.start()
4. Thread.start() waits self.__started event which is set by Thread.__bootstrap
5. While finalizing, threads other than main thread exits when getting GIL. So
Thread.__bootstrap() won't be called.
6. Thread.start() in main thread waits self.__started event forever.
I suggest thread_PyThread_start_new_thread() raise RuntimeError("can't start
thread: finalizing")
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Added file: http://bugs.python.org/file45643/finish-deadlock.py
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<http://bugs.python.org/issue28673>
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