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I've been messing with PyGILState_... handling for my embedded python interpreter and came across this issue:
code in PyGILState_Release:
 PyThreadState *tcur = (PyThreadState *)PyThread_get_key_value(
 autoTLSkey);
 if (tcur == NULL)
 Py_FatalError("auto-releasing thread-state, "
 "but no thread-state for this thread");
The Py_FatalError() call will then invoke PyErr_Fetch() which won't check if PyThreadState_GET() returns a valid ptr (!= NULL):
PyErr_Fetch(PyObject **p_type, PyObject **p_value, PyObject **p_traceback)
{
 PyThreadState *tstate = PyThreadState_GET();
 *p_type = tstate->curexc_type;