(gdb) bt
#0  0x0000000803f0864a in thr_kill () from /lib/libc.so.7
#1  0x0000000803f08636 in raise () from /lib/libc.so.7
#2  0x0000000803f08606 in abort () from /lib/libc.so.7
#3  0x0000000803f6ef31 in __assert () from /lib/libc.so.7
#4  0x00000008029722c3 in cairo_scaled_font_destroy () from /usr/local/lib/libcairo.so.2
#5  0x0000000802974cd2 in cairo_scaled_font_glyph_extents () from /usr/local/lib/libcairo.so.2
#6  0x0000000802973bc3 in cairo_scaled_font_glyph_extents () from /usr/local/lib/libcairo.so.2
#7  0x000000080297431c in cairo_scaled_font_glyph_extents () from /usr/local/lib/libcairo.so.2
#8  0x000000080293f1ca in cairo_font_options_get_hint_metrics () from /usr/local/lib/libcairo.so.2
#9  0x0000000802931cf6 in cairo_glyph_path () from /usr/local/lib/libcairo.so.2
#10 0x00000008041fee42 in pango_cairo_error_underline_path () from /usr/local/lib/libpangocairo-1.0.so.0
#11 0x00000008041fe1d2 in pango_cairo_error_underline_path () from /usr/local/lib/libpangocairo-1.0.so.0
#12 0x0000000802e748bb in pango_renderer_draw_glyphs () from /usr/local/lib/libpango-1.0.so.0
#13 0x0000000802e74044 in pango_renderer_draw_layout_line () from /usr/local/lib/libpango-1.0.so.0
#14 0x0000000802e73b56 in pango_renderer_draw_layout () from /usr/local/lib/libpango-1.0.so.0
#15 0x00000008041fde13 in pango_cairo_layout_path () from /usr/local/lib/libpangocairo-1.0.so.0
#16 0x000000080b0963b7 in murrine_style_draw_layout () from /usr/local/lib/gtk-2.0/2.10.0/engines/libmurrine.so
#17 0x0000000801f4daf1 in gtk_label_get_track_visited_links () from /usr/local/lib/libgtk-x11-2.0.so.0
#18 0x0000000801f59eff in _gtk_marshal_BOOLEAN__BOXED () from /usr/local/lib/libgtk-x11-2.0.so.0
#19 0x00000008030a69f6 in g_closure_invoke () from /usr/local/lib/libgobject-2.0.so.0
#20 0x00000008030bb6a4 in g_signal_emitv () from /usr/local/lib/libgobject-2.0.so.0
#21 0x00000008030bc2de in g_signal_emit_valist () from /usr/local/lib/libgobject-2.0.so.0
#22 0x00000008030bc964 in g_signal_emit () from /usr/local/lib/libgobject-2.0.so.0
#23 0x000000080208358c in gtk_widget_event () from /usr/local/lib/libgtk-x11-2.0.so.0
#24 0x0000000801ed5bfd in gtk_container_propagate_expose () from /usr/local/lib/libgtk-x11-2.0.so.0
#25 0x0000000801ea2a36 in _gtk_box_set_old_defaults () from /usr/local/lib/libgtk-x11-2.0.so.0
#26 0x0000000801ed68ec in gtk_container_propagate_expose () from /usr/local/lib/libgtk-x11-2.0.so.0
#27 0x0000000801f59eff in _gtk_marshal_BOOLEAN__BOXED () from /usr/local/lib/libgtk-x11-2.0.so.0
#28 0x00000008030a69f6 in g_closure_invoke () from /usr/local/lib/libgobject-2.0.so.0
#29 0x00000008030bb6a4 in g_signal_emitv () from /usr/local/lib/libgobject-2.0.so.0
#30 0x00000008030bc2de in g_signal_emit_valist () from /usr/local/lib/libgobject-2.0.so.0
#31 0x00000008030bc964 in g_signal_emit () from /usr/local/lib/libgobject-2.0.so.0
#32 0x000000080208358c in gtk_widget_event () from /usr/local/lib/libgtk-x11-2.0.so.0
#33 0x0000000801ed5bfd in gtk_container_propagate_expose () from /usr/local/lib/libgtk-x11-2.0.so.0
#34 0x00000008020284f3 in gtk_toggle_button_get_inconsistent () from /usr/local/lib/libgtk-x11-2.0.so.0
#35 0x000000080086dbc4 in xfce_arrow_button_expose_event () from /usr/local/lib/libxfce4panel-1.0.so.4
#36 0x0000000801f59eff in _gtk_marshal_BOOLEAN__BOXED () from /usr/local/lib/libgtk-x11-2.0.so.0
#37 0x00000008030a69f6 in g_closure_invoke () from /usr/local/lib/libgobject-2.0.so.0
#38 0x00000008030bb6a4 in g_signal_emitv () from /usr/local/lib/libgobject-2.0.so.0
#39 0x00000008030bc2de in g_signal_emit_valist () from /usr/local/lib/libgobject-2.0.so.0
#40 0x00000008030bc964 in g_signal_emit () from /usr/local/lib/libgobject-2.0.so.0
#41 0x000000080208358c in gtk_widget_event () from /usr/local/lib/libgtk-x11-2.0.so.0
#42 0x0000000801ed5bfd in gtk_container_propagate_expose () from /usr/local/lib/libgtk-x11-2.0.so.0
#43 0x000000080de28770 in xfce_tasklist_forall () from /usr/local/lib/xfce4/panel/plugins/libtasklist.so
#44 0x0000000801ed68ec in gtk_container_propagate_expose () from /usr/local/lib/libgtk-x11-2.0.so.0
#45 0x0000000801f59eff in _gtk_marshal_BOOLEAN__BOXED () from /usr/local/lib/libgtk-x11-2.0.so.0
#46 0x00000008030a69f6 in g_closure_invoke () from /usr/local/lib/libgobject-2.0.so.0
#47 0x00000008030bb6a4 in g_signal_emitv () from /usr/local/lib/libgobject-2.0.so.0
#48 0x00000008030bc2de in g_signal_emit_valist () from /usr/local/lib/libgobject-2.0.so.0
#49 0x00000008030bc964 in g_signal_emit () from /usr/local/lib/libgobject-2.0.so.0
#50 0x000000080208358c in gtk_widget_event () from /usr/local/lib/libgtk-x11-2.0.so.0
#51 0x0000000801ed5bfd in gtk_container_propagate_expose () from /usr/local/lib/libgtk-x11-2.0.so.0
#52 0x0000000801ea2a36 in _gtk_box_set_old_defaults () from /usr/local/lib/libgtk-x11-2.0.so.0
#53 0x0000000801ed68ec in gtk_container_propagate_expose () from /usr/local/lib/libgtk-x11-2.0.so.0
#54 0x0000000801f59eff in _gtk_marshal_BOOLEAN__BOXED () from /usr/local/lib/libgtk-x11-2.0.so.0
#55 0x00000008030a69f6 in g_closure_invoke () from /usr/local/lib/libgobject-2.0.so.0
#56 0x00000008030bb6a4 in g_signal_emitv () from /usr/local/lib/libgobject-2.0.so.0
#57 0x00000008030bc2de in g_signal_emit_valist () from /usr/local/lib/libgobject-2.0.so.0
#58 0x00000008030bc964 in g_signal_emit () from /usr/local/lib/libgobject-2.0.so.0
#59 0x000000080208358c in gtk_widget_event () from /usr/local/lib/libgtk-x11-2.0.so.0
#60 0x0000000801ed5bfd in gtk_container_propagate_expose () from /usr/local/lib/libgtk-x11-2.0.so.0
#61 0x0000000801ed68ec in gtk_container_propagate_expose () from /usr/local/lib/libgtk-x11-2.0.so.0
#62 0x0000000801eee1ea in gtk_event_box_set_above_child () from /usr/local/lib/libgtk-x11-2.0.so.0
#63 0x0000000801f59eff in _gtk_marshal_BOOLEAN__BOXED () from /usr/local/lib/libgtk-x11-2.0.so.0
#64 0x00000008030a69f6 in g_closure_invoke () from /usr/local/lib/libgobject-2.0.so.0
#65 0x00000008030bb6a4 in g_signal_emitv () from /usr/local/lib/libgobject-2.0.so.0
#66 0x00000008030bc2de in g_signal_emit_valist () from /usr/local/lib/libgobject-2.0.so.0
#67 0x00000008030bc964 in g_signal_emit () from /usr/local/lib/libgobject-2.0.so.0
#68 0x000000080208358c in gtk_widget_event () from /usr/local/lib/libgtk-x11-2.0.so.0
#69 0x0000000801ed5bfd in gtk_container_propagate_expose () from /usr/local/lib/libgtk-x11-2.0.so.0
#70 0x000000000041e729 in panel_itembar_set_drop_highlight_item ()
#71 0x0000000801ed68ec in gtk_container_propagate_expose () from /usr/local/lib/libgtk-x11-2.0.so.0
#72 0x000000000041e38b in panel_itembar_set_drop_highlight_item ()
#73 0x0000000801f59eff in _gtk_marshal_BOOLEAN__BOXED () from /usr/local/lib/libgtk-x11-2.0.so.0
#74 0x00000008030a69f6 in g_closure_invoke () from /usr/local/lib/libgobject-2.0.so.0
#75 0x00000008030bb6a4 in g_signal_emitv () from /usr/local/lib/libgobject-2.0.so.0
#76 0x00000008030bc2de in g_signal_emit_valist () from /usr/local/lib/libgobject-2.0.so.0
#77 0x00000008030bc964 in g_signal_emit () from /usr/local/lib/libgobject-2.0.so.0
#78 0x000000080208358c in gtk_widget_event () from /usr/local/lib/libgtk-x11-2.0.so.0
#79 0x0000000801ed5bfd in gtk_container_propagate_expose () from /usr/local/lib/libgtk-x11-2.0.so.0
#80 0x000000000042f25f in panel_window_migrate_autohide_property ()
#81 0x0000000801f59eff in _gtk_marshal_BOOLEAN__BOXED () from /usr/local/lib/libgtk-x11-2.0.so.0
#82 0x00000008030a6a52 in g_closure_invoke () from /usr/local/lib/libgobject-2.0.so.0
#83 0x00000008030bb6a4 in g_signal_emitv () from /usr/local/lib/libgobject-2.0.so.0
#84 0x00000008030bc2de in g_signal_emit_valist () from /usr/local/lib/libgobject-2.0.so.0
#85 0x00000008030bc964 in g_signal_emit () from /usr/local/lib/libgobject-2.0.so.0
#86 0x000000080208358c in gtk_widget_event () from /usr/local/lib/libgtk-x11-2.0.so.0
#87 0x0000000801f57c01 in gtk_main_do_event () from /usr/local/lib/libgtk-x11-2.0.so.0
#88 0x00000008024788fc in gdk_window_clear_area_e () from /usr/local/lib/libgdk-x11-2.0.so.0
#89 0x000000080247939a in gdk_window_process_all_updates () from /usr/local/lib/libgdk-x11-2.0.so.0
#90 0x0000000802478e1d in gdk_window_process_all_updates () from /usr/local/lib/libgdk-x11-2.0.so.0
#91 0x0000000801ed4250 in _gtk_container_queue_resize () from /usr/local/lib/libgtk-x11-2.0.so.0
#92 0x0000000802455885 in gdk_threads_add_idle_full () from /usr/local/lib/libgdk-x11-2.0.so.0
#93 0x000000080353a5c8 in g_main_context_dispatch () from /usr/local/lib/libglib-2.0.so.0
#94 0x000000080353a8fb in g_main_context_pending () from /usr/local/lib/libglib-2.0.so.0
#95 0x000000080353ac0f in g_main_loop_run () from /usr/local/lib/libglib-2.0.so.0
#96 0x0000000801f5746f in gtk_main () from /usr/local/lib/libgtk-x11-2.0.so.0
#97 0x0000000000412983 in main ()