.
Thread 1 (process 6384):
#0  0xb7a565c8 in g_type_check_instance_cast ()
   from /usr/lib/libgobject-2.0.so.0
#1  0x0804ca31 in ?? ()
#2  0xb7a448ec in g_cclosure_marshal_VOID__OBJECT ()
   from /usr/lib/libgobject-2.0.so.0
#3  0xb7a37c53 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#4  0xb7a4e0c5 in ?? () from /usr/lib/libgobject-2.0.so.0
#5  0xb7a4f7e4 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#6  0xb7a4fc66 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#7  0xb7e6500d in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#8  0xb7e65641 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#9  0xb7e696bc in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#10 0xb7e745fd in gtk_widget_unparent () from /usr/lib/libgtk-x11-2.0.so.0
#11 0xb7c90b23 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#12 0xb7a448ec in g_cclosure_marshal_VOID__OBJECT ()
   from /usr/lib/libgobject-2.0.so.0
#13 0xb7a363c9 in ?? () from /usr/lib/libgobject-2.0.so.0
#14 0xb7a37c53 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#15 0xb7a4d8fe in ?? () from /usr/lib/libgobject-2.0.so.0
#16 0xb7a4f7e4 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#17 0xb7a4fc66 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#18 0xb7cc7496 in gtk_container_remove () from /usr/lib/libgtk-x11-2.0.so.0
#19 0xb7e6f01d in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#20 0xb7a3a26f in g_object_run_dispose () from /usr/lib/libgobject-2.0.so.0
#21 0xb7d732de in gtk_object_destroy () from /usr/lib/libgtk-x11-2.0.so.0
#22 0xb7c908fd in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#23 0xb7cc6a96 in gtk_container_foreach () from /usr/lib/libgtk-x11-2.0.so.0
#24 0xb7cc7368 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#25 0xb7e7fd23 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#26 0xb7a453e4 in g_cclosure_marshal_VOID__VOID ()
   from /usr/lib/libgobject-2.0.so.0
#27 0xb7a363c9 in ?? () from /usr/lib/libgobject-2.0.so.0
#28 0xb7a37c53 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#29 0xb7a4e4c8 in ?? () from /usr/lib/libgobject-2.0.so.0
#30 0xb7a4f7e4 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#31 0xb7a4fc66 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#32 0xb7d735e1 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#33 0xb7e6f041 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#34 0xb7e7c9a6 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#35 0xb7a3a26f in g_object_run_dispose () from /usr/lib/libgobject-2.0.so.0
#36 0xb7d732de in gtk_object_destroy () from /usr/lib/libgtk-x11-2.0.so.0
#37 0xb8091749 in ?? () from /usr/lib/libxfce4panel.so.1
#38 0xb7d4fc36 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#39 0xb7a37c53 in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#40 0xb7a4e0c5 in ?? () from /usr/lib/libgobject-2.0.so.0
#41 0xb7a4f65b in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#42 0xb7a4fc66 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#43 0xb7e651ee in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#44 0xb7d49be7 in gtk_main_do_event () from /usr/lib/libgtk-x11-2.0.so.0
#45 0xb7bd182a in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#46 0xb79aa6b1 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#47 0xb79add53 in ?? () from /usr/lib/libglib-2.0.so.0
#48 0xb79ae272 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#49 0xb7d49fc9 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#50 0x0804c40f in ?? ()
#51 0xb780f685 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#52 0x0804c2e1 in ?? ()