I know this issue is closed, but for this patch, the code:

+    modstate = get_atexitmodule_state(module);
+
+    if (modstate->ncallbacks == 0)
+        return;

was added.

Is there any condition under which modstate could be NULL.

Haven't touched Python 3.0 support in mod_wsgi for a long time and when 
revisiting code with final Python 3.0, I find that I get Py_Finalize() 
crashing on process shutdown. It is crashing because modstate above is 
NULL.