#0  0xb77ef85c in g_type_check_instance_cast ()
   from /usr/lib/libgobject-2.0.so.0
#1  0xaf7812ab in volumes_drives_changed (volume_monitor=0x8344568, 
    volume=0x814f540, user_data=0x86d9ab0) at gtkfilesystemgio.c:398
No locals.
#2  0xb77def5a in g_cclosure_marshal_VOID__OBJECT ()
   from /usr/lib/libgobject-2.0.so.0
#3  0xb77d2759 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#4  0xb77e6d1d in ?? () from /usr/lib/libgobject-2.0.so.0
#5  0x0876a080 in ?? ()
#6  0x00000000 in ?? ()