If a session managed app (e.g. the panel) crashes, gnome_segv brings up the same
dialog it always shows, offering to restart the app. That is futile if the app
is set to be restarted immediately be the session manager (like the panel). The
instance started by gnome_segv and the one started by the session manager get
into a fight. 

I think the ideal behaviour would be for gnome_segv to be clever enough to
figure out that the app is session managed (and its restart mode) and if it is
restart immediately it shouldn't show the "Restart" button, but rather a note
explaining that the app will be restarted automatically.