$ gdb tutka
GNU gdb 6.4-debian
(gdb) r
Starting program: /usr/local/bin/tutka
[Thread debugging using libthread_db enabled]
[New Thread -1223760192 (LWP 16599)]
[New Thread -1225544784 (LWP 16602)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1223760192 (LWP 16599)]
0x0806aebc in editor_song_nummessages_get (editor=0x80f6508) at editor.c:1165
1165      return editor->song->nummessages;
(gdb) bt
#0  0x0806aebc in editor_song_nummessages_get (editor=0x80f6508)
    at editor.c:1165
#1  0x0807167f in gui_messagelist_refresh (gui=0x80f6a00, recreate=0)
    at gui.c:921
#2  0x0807473e in on_selection_messagelist_changed (selection=0x0,
    user_data=0x80f6a00) at callbacks.c:740
#3  0xb751d423 in g_cclosure_marshal_VOID__VOID ()
   from /usr/lib/libgobject-2.0.so.0
#4  0xb751179f in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#5  0xb75202ea in g_signal_stop_emission () from /usr/lib/libgobject-2.0.so.0
#6  0xb7521b19 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#7  0xb7521e89 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#8  0xb7ad474e in _gtk_tree_selection_emit_changed ()
   from /usr/lib/libgtk-x11-2.0.so.0
#9  0xb7aee18f in gtk_tree_view_set_model () from /usr/lib/libgtk-x11-2.0.so.0
#10 0x0806ebf2 in gui_open (editor=0x80f6508) at gui.c:198
#11 0x0806d35f in editor_open () at editor.c:59
#12 0x08053d00 in main (argc=1, argv=0xbfdb35a4) at main.c:54
(gdb)