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Thread 1 (process 21809):
#0  0xb7a814f5 in gtk_tree_model_get_valist () from /usr/lib/libgtk-x11-2.0.so.0
#1  0xb7a816dd in gtk_tree_model_get () from /usr/lib/libgtk-x11-2.0.so.0
#2  0x080742c8 in alphabet_combo_changed ()
#3  0xb745dc09 in g_cclosure_marshal_VOID__VOID () from /usr/lib/libgobject-2.0.so.0
#4  0xb7450772 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#5  0xb7461323 in ?? () from /usr/lib/libgobject-2.0.so.0
#6  0x08648d08 in ?? ()
#7  0x00000000 in ?? ()