STINNER Victor added the comment:
debug-build-stacktrace.txt:
* Thread 1 is waiting on threading_hang.py:21: thread.join()
* Thread 2-6 (5 threads) are waiting for the GIL
The thread 1 is not supposed to hold the GIL: thread.join() is implemented by
lock_PyThread_acquire_lock() at Modules/threadmodule.c:52:
Py_BEGIN_ALLOW_THREADS
i = PyThread_acquire_lock(self->lock_lock, i);
Py_END_ALLOW_THREADS
Note: I backported enhancements of python-gdb.py from Python 3, but I'm not
sure that "Waiting for the GIL" line is reliable :-/ I recall vaguely a
technical issue specific to Python 2 to check if a thread is waiting on the GIL
or not.
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<http://bugs.python.org/issue26360>
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