see https://bugzilla.novell.com/show_bug.cgi?id=171066

Basically, under some circumstances not yet determined,
PyCFunction_Fini() goes into an endless loop over a
cyclic linked list.

void
PyCFunction_Fini(void)
{
    while (free_list) {
        PyCFunctionObject *v = free_list;
        free_list = (PyCFunctionObject *)(v->m_self);
        PyObject_GC_Del(v);
    }
}

it looks like it's sufficient to do
v->m_self = NULL;
or something.
However, for one, i'm not sure if this wouldn't break
something, and for two, free_list should never be
cyclic, right?