Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x2b53052c5470 (LWP 19039)]
0x00002b5302517509 in g_utf8_validate () from /usr/lib/libglib-2.0.so.0
(gdb) bt
#0  0x00002b5302517509 in g_utf8_validate () from /usr/lib/libglib-2.0.so.0
#1  0x00002b53024db903 in ?? () from /usr/lib/libglib-2.0.so.0
#2  0x00002b53024dc1ce in g_locale_from_utf8 () from /usr/lib/libglib-2.0.so.0
#3  0x00002b5306e6005c in xfce_clock_util_strdup_strftime (format=0x0, tm=0x7fffaabb0200) at clock.c:205
#4  0x00002b5306e60127 in xfce_clock_tooltip_update (user_data=<value optimized out>) at clock.c:244
#5  0x00002b5306e60514 in xfce_clock_plugin_construct (plugin=0x6dc830) at clock.c:505
#6  0x00002b530011ddfe in _plugin_setup (plugin=0x6dc830, construct=0x2b5306e602d0 <xfce_clock_plugin_construct>) at xfce-panel-internal-plugin.c:644
#7  0x00002b5301d76a1f in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#8  0x00002b5301d8ac87 in ?? () from /usr/lib/libgobject-2.0.so.0
#9  0x00002b5301d8c145 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#10 0x00002b5301d8c533 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#11 0x00002b53007da307 in gtk_widget_realize () from /usr/lib/libgtk-x11-2.0.so.0
#12 0x00002b53007da588 in gtk_widget_map () from /usr/lib/libgtk-x11-2.0.so.0
#13 0x00002b530011b88b in xfce_itembar_forall (container=<value optimized out>, include_internals=<value optimized out>, callback=0x2b530063ef30,
    callback_data=0x0) at xfce-itembar.c:778
#14 0x00002b530063ef19 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#15 0x00002b530011ba6e in xfce_itembar_map (widget=0x69e8c0) at xfce-itembar.c:646
#16 0x00002b5301d76aec in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#17 0x00002b5301d8a3be in ?? () from /usr/lib/libgobject-2.0.so.0
#18 0x00002b5301d8c145 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#19 0x00002b5301d8c533 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#20 0x00002b53007da544 in gtk_widget_map () from /usr/lib/libgtk-x11-2.0.so.0
#21 0x00002b53007e9505 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#22 0x00002b5301d76a1f in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#23 0x00002b5301d8a3be in ?? () from /usr/lib/libgobject-2.0.so.0
#24 0x00002b5301d8c145 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#25 0x00002b5301d8c533 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#26 0x00002b53007da544 in gtk_widget_map () from /usr/lib/libgtk-x11-2.0.so.0
#27 0x00002b53007e9540 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#28 0x00002b5300119ff4 in xfce_panel_window_show (widget=0x67e270) at xfce-panel-window.c:442
#29 0x00002b5301d76a1f in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#30 0x00002b5301d8a3be in ?? () from /usr/lib/libgobject-2.0.so.0
#31 0x00002b5301d8c145 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#32 0x00002b5301d8c533 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#33 0x00002b53007dac1d in gtk_widget_show () from /usr/lib/libgtk-x11-2.0.so.0
#34 0x000000000040caa9 in panel_app_init_panel (panel=0x67e270) at panel-app.c:666
#35 0x00002b53024d2da4 in g_ptr_array_foreach () from /usr/lib/libglib-2.0.so.0
#36 0x000000000040c8f7 in panel_app_run (client_id=0x1 <Address 0x1 out of bounds>) at panel-app.c:744
#37 0x000000000040a53b in main (argc=1, argv=0x7fffaabb2078) at main.c:154