bpo-20526: Fix PyThreadState_Clear(): don't decref frame #19120
Merged
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PyThreadState.frame is a borrowed reference, not a strong reference:
PyThreadState_Clear() must not call Py_CLEAR(tstate->frame).
Remove test_threading.test_warnings_at_exit(): we cannot warranty
that the Python thread state of daemon threads is cleared in a
reliable way during Python shutdown.
https://bugs.python.org/issue20526