Thread 1 "xfce4-panel" received signal SIGSEGV, Segmentation fault.
0x00007fce04069a6d in xfce_arrow_button_blinking_timeout_destroyed (user_data=0x28305a0) at xfce-arrow-button.c:653
653	  button->priv->blinking_counter = 0;
(gdb) bt
#0  0x00007fce04069a6d in xfce_arrow_button_blinking_timeout_destroyed (user_data=0x28305a0) at xfce-arrow-button.c:653
#1  0x00007fce03263558 in gdk_threads_dispatch_free (data=0x2829400) at ../../../../src/gnome/gtk+-3/gdk/gdk.c:790
#2  0x00007fce02d97123 in g_source_callback_unref (cb_data=0x2483ff0) at ../../../../src/gnome/glib/glib/gmain.c:1549
#3  g_source_callback_unref (cb_data=0x2483ff0) at ../../../../src/gnome/glib/glib/gmain.c:1542
#4  0x00007fce02d97929 in g_source_destroy_internal (source=0x2854db0, context=0x20a7be0, have_lock=0)
    at ../../../../src/gnome/glib/glib/gmain.c:1231
#5  0x00007fce02d9945c in g_source_remove (tag=5308) at ../../../../src/gnome/glib/glib/gmain.c:2353
#6  0x00007fce04069a25 in xfce_arrow_button_finalize (object=0x28305a0) at xfce-arrow-button.c:273
#7  0x00007fce02e85d6e in g_object_unref (_object=<optimized out>) at ../../../../src/gnome/glib/gobject/gobject.c:3379
#8  g_object_unref (_object=0x28305a0) at ../../../../src/gnome/glib/gobject/gobject.c:3271
#9  0x00007fce02e80de2 in g_closure_invoke (closure=0x23163d0, return_value=0x0, n_param_values=2, param_values=0x7ffd8ee663c0, 
    invocation_hint=0x7ffd8ee66360) at ../../../../src/gnome/glib/gobject/gclosure.c:810
#10 0x00007fce02e93cb4 in signal_emit_unlocked_R (node=node@entry=0x2227460, detail=detail@entry=0, instance=instance@entry=0x21df640, 
    emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7ffd8ee663c0)
    at ../../../../src/gnome/glib/gobject/gsignal.c:3635
#11 0x00007fce02e9cade in g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, 
    var_args=var_args@entry=0x7ffd8ee66568) at ../../../../src/gnome/glib/gobject/gsignal.c:3391
#12 0x00007fce02e9d142 in g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>)
    at ../../../../src/gnome/glib/gobject/gsignal.c:3447
#13 0x00007fce03aa9acb in emit_window_closed (screen=0x21df640, window=0x244fc40)
    at /home/ofourdan/src/gnome/libwnck/libwnck/screen.c:2297
#14 0x00007fce03aa858d in update_client_list (screen=0x21df640) at /home/ofourdan/src/gnome/libwnck/libwnck/screen.c:1640
#15 0x00007fce03aa9843 in do_update_now (screen=0x21df640) at /home/ofourdan/src/gnome/libwnck/libwnck/screen.c:2212
#16 0x00007fce03aa98d5 in update_idle (data=0x21df640) at /home/ofourdan/src/gnome/libwnck/libwnck/screen.c:2235
#17 0x00007fce02d9a4ee in g_main_dispatch (context=0x20a7be0) at ../../../../src/gnome/glib/glib/gmain.c:3176
#18 g_main_context_dispatch (context=context@entry=0x20a7be0) at ../../../../src/gnome/glib/glib/gmain.c:3841
#19 0x00007fce02d9a870 in g_main_context_iterate (context=0x20a7be0, block=block@entry=1, dispatch=dispatch@entry=1, 
    self=<optimized out>) at ../../../../src/gnome/glib/glib/gmain.c:3914
#20 0x00007fce02d9ab43 in g_main_loop_run (loop=0x21034d0) at ../../../../src/gnome/glib/glib/gmain.c:4108
#21 0x00007fce03535f15 in gtk_main () at ../../../../src/gnome/gtk+-3/gtk/gtkmain.c:1323
#22 0x0000000000413ef1 in main (argc=<optimized out>, argv=<optimized out>) at main.c:385
(gdb) 
#0  0x00007fce04069a6d in xfce_arrow_button_blinking_timeout_destroyed (user_data=0x28305a0) at xfce-arrow-button.c:653
#1  0x00007fce03263558 in gdk_threads_dispatch_free (data=0x2829400) at ../../../../src/gnome/gtk+-3/gdk/gdk.c:790
#2  0x00007fce02d97123 in g_source_callback_unref (cb_data=0x2483ff0) at ../../../../src/gnome/glib/glib/gmain.c:1549
#3  g_source_callback_unref (cb_data=0x2483ff0) at ../../../../src/gnome/glib/glib/gmain.c:1542
#4  0x00007fce02d97929 in g_source_destroy_internal (source=0x2854db0, context=0x20a7be0, have_lock=0)
    at ../../../../src/gnome/glib/glib/gmain.c:1231
#5  0x00007fce02d9945c in g_source_remove (tag=5308) at ../../../../src/gnome/glib/glib/gmain.c:2353
#6  0x00007fce04069a25 in xfce_arrow_button_finalize (object=0x28305a0) at xfce-arrow-button.c:273
#7  0x00007fce02e85d6e in g_object_unref (_object=<optimized out>) at ../../../../src/gnome/glib/gobject/gobject.c:3379
#8  g_object_unref (_object=0x28305a0) at ../../../../src/gnome/glib/gobject/gobject.c:3271
#9  0x00007fce02e80de2 in g_closure_invoke (closure=0x23163d0, return_value=0x0, n_param_values=2, param_values=0x7ffd8ee663c0, 
    invocation_hint=0x7ffd8ee66360) at ../../../../src/gnome/glib/gobject/gclosure.c:810
#10 0x00007fce02e93cb4 in signal_emit_unlocked_R (node=node@entry=0x2227460, detail=detail@entry=0, instance=instance@entry=0x21df640, 
    emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7ffd8ee663c0)
    at ../../../../src/gnome/glib/gobject/gsignal.c:3635
#11 0x00007fce02e9cade in g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>, 
    var_args=var_args@entry=0x7ffd8ee66568) at ../../../../src/gnome/glib/gobject/gsignal.c:3391
#12 0x00007fce02e9d142 in g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>)
    at ../../../../src/gnome/glib/gobject/gsignal.c:3447
#13 0x00007fce03aa9acb in emit_window_closed (screen=0x21df640, window=0x244fc40)
    at /home/ofourdan/src/gnome/libwnck/libwnck/screen.c:2297
#14 0x00007fce03aa858d in update_client_list (screen=0x21df640) at /home/ofourdan/src/gnome/libwnck/libwnck/screen.c:1640
#15 0x00007fce03aa9843 in do_update_now (screen=0x21df640) at /home/ofourdan/src/gnome/libwnck/libwnck/screen.c:2212
#16 0x00007fce03aa98d5 in update_idle (data=0x21df640) at /home/ofourdan/src/gnome/libwnck/libwnck/screen.c:2235
#17 0x00007fce02d9a4ee in g_main_dispatch (context=0x20a7be0) at ../../../../src/gnome/glib/glib/gmain.c:3176
#18 g_main_context_dispatch (context=context@entry=0x20a7be0) at ../../../../src/gnome/glib/glib/gmain.c:3841
#19 0x00007fce02d9a870 in g_main_context_iterate (context=0x20a7be0, block=block@entry=1, dispatch=dispatch@entry=1, 
    self=<optimized out>) at ../../../../src/gnome/glib/glib/gmain.c:3914
#20 0x00007fce02d9ab43 in g_main_loop_run (loop=0x21034d0) at ../../../../src/gnome/glib/glib/gmain.c:4108
#21 0x00007fce03535f15 in gtk_main () at ../../../../src/gnome/gtk+-3/gtk/gtkmain.c:1323
#22 0x0000000000413ef1 in main (argc=<optimized out>, argv=<optimized out>) at main.c:385

(gdb) p *button
$2 = {__parent__ = {button = {bin = {container = {widget = {parent_instance = {g_type_instance = {g_class = 0xaaaaaaaaaaaaaaaa}, 
              ref_count = 2863311530, qdata = 0xaaaaaaaaaaaaaaaa}, priv = 0xaaaaaaaaaaaaaaaa}, priv = 0xaaaaaaaaaaaaaaaa}, 
        priv = 0xaaaaaaaaaaaaaaaa}, priv = 0xaaaaaaaaaaaaaaaa}, priv = 0xaaaaaaaaaaaaaaaa}, priv = 0xaaaaaaaaaaaaaaaa}
(gdb)