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It appears to me that PyAutoThreadState_Release calls 
PyThreadState_Clear after releasing the GIL (if the thread 
state was created by PyAutoThreadState_Ensure, then old 
state will be UNLOCKED, so PyEval_ReleaseThread will be 
called).  It looks to me that, if the thread state is going to be 
deleted, the call to Clear it should be moved up to just before 
ReleaseThread, i.e.:

if (oldstate == PyAutoThreadState_UNLOCKED) {
    if (tcur->autothreadstate_counter == 1)
        PyThreadState_Clear(tcur);
    PyEval_ReleaseThread(tcur);
}