IA__gtk_tree_model_get_valist crashes

[Michael Schwendt]

Various apps crashing in gtktreemodel.c's

  IA__gtk_tree_model_get_valist  

https://bugzilla.redhat.com/buglist.cgi?query_format=advanced&short_desc=IA__gtk_tree_model_get_valist&bug_status=NEW&bug_status=ASSIGNED&short_desc_type=allwordssubstr&classification=Fedora

Sometimes after a button press callback, other times related to comboboxes.
Do these issues have anything in common? e.g. incorrect gtk2 API usage?