I am on Edgy.

Here is the backtrace :

Memory status: size: 34480128 vsize: 0 resident: 34480128 share: 0 rss: 13246464 rss_rlim: 0
CPU usage: start_time: 1171459162 rtime: 0 utime: 48 stime: 0 cutime:44 cstime: 0 timeout: 4 it_real_value: 0 frequency: 0

Backtrace was generated from '/usr/libexec/gnome-main-menu'

Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1226754384 (LWP 7607)]
0xffffe410 in __kernel_vsyscall ()
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb7314323 in __waitpid_nocancel ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7e601b6 in libgnomeui_segv_handle (signum=11) at gnome-ui-init.c:874
#3  <signal handler called>
#4  0x0805e9d3 in get_gconf_value (
    key=0x80651f4 "/apps/panel/global/disable_lock_screen")
    at gnome-utils.c:137
#5  0x08053f65 in build_main_menu_window (ui=0x8091288) at main-menu-ui.c:922
#6  0x08054aa4 in main_menu_ui_new (applet=0x80ba800, conf=0x80c9400, 
    engine=0x80df648) at main-menu-ui.c:230
#7  0x08052922 in main_menu_applet_init (applet=0x80ba800, 
    iid=0x80cd180 "OAFIID:GNOME_MainMenu", user_data=0x0) at main-menu.c:66
#8  0xb7ece7fe in panel_applet_marshal_BOOLEAN__STRING ()
   from /usr/lib/libpanel-applet-2.so.0
#9  0xb73be79b in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#10 0xb7cd2d84 in bonobo_closure_invoke_va_list ()
   from /usr/lib/libbonobo-2.so.0
#11 0xb7cd2fec in bonobo_closure_invoke () from /usr/lib/libbonobo-2.so.0
#12 0xb7ecd4a6 in panel_applet_add_preferences ()
   from /usr/lib/libpanel-applet-2.so.0
#13 0xb73cbb29 in g_cclosure_marshal_VOID__VOID ()
   from /usr/lib/libgobject-2.0.so.0
#14 0xb73be79b in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#15 0xb73ceb93 in g_signal_chain_from_overridden ()
   from /usr/lib/libgobject-2.0.so.0
#16 0xb73d00b7 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#17 0xb73d0279 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#18 0xb7db886b in bonobo_control_add_listener ()
   from /usr/lib/libbonoboui-2.so.0
#19 0xb7cd5bc1 in _ORBIT_skel_small_Bonobo_Control_setFrame ()
   from /usr/lib/libbonobo-2.so.0
#20 0xb7be1b07 in IOP_start_profiles () from /usr/lib/libORBit-2.so.0
#21 0xb7be7c75 in ORBit_OAObject_invoke () from /usr/lib/libORBit-2.so.0
#22 0xb7bd4dbc in ORBit_small_invoke_adaptor () from /usr/lib/libORBit-2.so.0
#23 0xb7be5916 in ORBit_recv_buffer_return_sys_exception ()
   from /usr/lib/libORBit-2.so.0
#24 0xb7be5fc2 in ORBit_recv_buffer_return_sys_exception ()
   from /usr/lib/libORBit-2.so.0
#25 0xb7be6a33 in ORBit_skel_class_register () from /usr/lib/libORBit-2.so.0
#26 0xb7be7e12 in ORBit_handle_request () from /usr/lib/libORBit-2.so.0
#27 0xb7bd1077 in giop_connection_handle_input ()
   from /usr/lib/libORBit-2.so.0
#28 0xb7beea1d in link_connection_state_changed ()
   from /usr/lib/libORBit-2.so.0
#29 0xb7bf19ce in link_io_add_watch_fd () from /usr/lib/libORBit-2.so.0
#30 0xb7346802 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0xb73497df in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#32 0xb7349b89 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#33 0xb7cc0a23 in bonobo_main () from /usr/lib/libbonobo-2.so.0
#34 0xb7cbec89 in bonobo_generic_factory_main_timeout ()
   from /usr/lib/libbonobo-2.so.0
#35 0xb7cbed13 in bonobo_generic_factory_main ()
   from /usr/lib/libbonobo-2.so.0
#36 0xb7ec9ad1 in panel_applet_factory_main_closure ()
   from /usr/lib/libpanel-applet-2.so.0
#37 0xb7ec9bb5 in panel_applet_factory_main ()
   from /usr/lib/libpanel-applet-2.so.0
#38 0x08052803 in main (argc=137224616, argv=0x0) at main-menu.c:34
#39 0xb71e88cc in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#40 0x080502c1 in _start ()

Thread 1 (Thread -1226754384 (LWP 7607)):
#0  0xffffe410 in __kernel_vsyscall ()
No symbol table info available.
#1  0xb7314323 in __waitpid_nocancel ()
   from /lib/tls/i686/cmov/libpthread.so.0
No symbol table info available.
#2  0xb7e601b6 in libgnomeui_segv_handle (signum=11) at gnome-ui-init.c:874
	estatus = -1221578764
	sa = {__sigaction_handler = {sa_handler = 0, sa_sigaction = 0}, 
  sa_mask = {__val = {3082653984, 2, 3082826024, 3218112776, 3082653182, 
      137477929, 3073388532, 3072561345, 137477728, 3218112824, 3072563780, 
      3073392928, 137477728, 137477744, 3082808864, 4, 112, 72, 3073337456, 
      3218112840, 3074081252, 137477728, 3082813504, 3218112856, 3074265620, 
      137477728, 137480500, 3218112904, 3082826024, 3082826024, 1073741825, 
      3218112904}}, sa_flags = -1220701676, sa_restorer = 0x8091048}
	pid = 0
	in_segv = 1
#3  <signal handler called>
No symbol table info available.
#4  0x0805e9d3 in get_gconf_value (
    key=0x80651f4 "/apps/panel/global/disable_lock_screen")
    at gnome-utils.c:137
	client = (GConfClient *) 0x806f560
	value = (GConfValue *) 0x0
	error = (GError *) 0x0
	retval = <value optimized out>
	list = <value optimized out>
	slist = <value optimized out>
	value_i = <value optimized out>
	node = <value optimized out>
	__PRETTY_FUNCTION__ = "get_gconf_value"
	__FUNCTION__ = "get_gconf_value"
#5  0x08053f65 in build_main_menu_window (ui=0x8091288) at main-menu-ui.c:922
	priv = (MainMenuUIPrivate *) 0x8091298
	window = (GtkWidget *) 0x831c010
	left_pane = (GtkWidget *) 0x82fe950
	search_show_label_group = (GtkSizeGroup *) 0x83194a0
	search_widget = (GtkWidget *) 0x82fe8b0
	right_pane = <value optimized out>
	right_pane_group = (GtkSizeGroup *) 0x83134c0
	icon_group = (GtkSizeGroup *) 0x8313640
	label_group = (GtkSizeGroup *) 0x8313660
	system_header = (GtkWidget *) 0x8310668
	status_header = (GtkWidget *) 0x83106e0
	system_table_widget = (GtkWidget *) 0x82fe9a0
	status_section = <value optimized out>
	hd_tile = <value optimized out>
	net_tile = <value optimized out>
#6  0x08054aa4 in main_menu_ui_new (applet=0x80ba800, conf=0x80c9400, 
    engine=0x80df648) at main-menu-ui.c:230
	ui = (MainMenuUI *) 0x8091288
	priv = (MainMenuUIPrivate *) 0x8091298
	gdk_atom_slab_action = <value optimized out>
#7  0x08052922 in main_menu_applet_init (applet=0x80ba800, 
    iid=0x80cd180 "OAFIID:GNOME_MainMenu", user_data=0x0) at main-menu.c:66
	argv = {0x8064e67 "slab"}
	conf = (MainMenuConf *) 0x80c9400
	engine = (MainMenuEngine *) 0x80df648
	ui = <value optimized out>
#8  0xb7ece7fe in panel_applet_marshal_BOOLEAN__STRING ()
   from /usr/lib/libpanel-applet-2.so.0
No symbol table info available.
#9  0xb73be79b in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#10 0xb7cd2d84 in bonobo_closure_invoke_va_list ()
   from /usr/lib/libbonobo-2.so.0
No symbol table info available.
#11 0xb7cd2fec in bonobo_closure_invoke () from /usr/lib/libbonobo-2.so.0
No symbol table info available.
#12 0xb7ecd4a6 in panel_applet_add_preferences ()
   from /usr/lib/libpanel-applet-2.so.0
No symbol table info available.
#13 0xb73cbb29 in g_cclosure_marshal_VOID__VOID ()
   from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#14 0xb73be79b in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#15 0xb73ceb93 in g_signal_chain_from_overridden ()
   from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#16 0xb73d00b7 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#17 0xb73d0279 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
No symbol table info available.
#18 0xb7db886b in bonobo_control_add_listener ()
   from /usr/lib/libbonoboui-2.so.0
No symbol table info available.
#19 0xb7cd5bc1 in _ORBIT_skel_small_Bonobo_Control_setFrame ()
   from /usr/lib/libbonobo-2.so.0
No symbol table info available.
#20 0xb7be1b07 in IOP_start_profiles () from /usr/lib/libORBit-2.so.0
No symbol table info available.
#21 0xb7be7c75 in ORBit_OAObject_invoke () from /usr/lib/libORBit-2.so.0
No symbol table info available.
#22 0xb7bd4dbc in ORBit_small_invoke_adaptor () from /usr/lib/libORBit-2.so.0
No symbol table info available.
#23 0xb7be5916 in ORBit_recv_buffer_return_sys_exception ()
   from /usr/lib/libORBit-2.so.0
No symbol table info available.
#24 0xb7be5fc2 in ORBit_recv_buffer_return_sys_exception ()
   from /usr/lib/libORBit-2.so.0
No symbol table info available.
#25 0xb7be6a33 in ORBit_skel_class_register () from /usr/lib/libORBit-2.so.0
No symbol table info available.
#26 0xb7be7e12 in ORBit_handle_request () from /usr/lib/libORBit-2.so.0
No symbol table info available.
#27 0xb7bd1077 in giop_connection_handle_input ()
   from /usr/lib/libORBit-2.so.0
No symbol table info available.
#28 0xb7beea1d in link_connection_state_changed ()
   from /usr/lib/libORBit-2.so.0
No symbol table info available.
#29 0xb7bf19ce in link_io_add_watch_fd () from /usr/lib/libORBit-2.so.0
No symbol table info available.
#30 0xb7346802 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#31 0xb73497df in g_main_context_check () from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#32 0xb7349b89 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
No symbol table info available.
#33 0xb7cc0a23 in bonobo_main () from /usr/lib/libbonobo-2.so.0
No symbol table info available.
#34 0xb7cbec89 in bonobo_generic_factory_main_timeout ()
   from /usr/lib/libbonobo-2.so.0
No symbol table info available.
#35 0xb7cbed13 in bonobo_generic_factory_main ()
   from /usr/lib/libbonobo-2.so.0
No symbol table info available.
#36 0xb7ec9ad1 in panel_applet_factory_main_closure ()
   from /usr/lib/libpanel-applet-2.so.0
No symbol table info available.
#37 0xb7ec9bb5 in panel_applet_factory_main ()
   from /usr/lib/libpanel-applet-2.so.0
No symbol table info available.
#38 0x08052803 in main (argc=137224616, argv=0x0) at main-menu.c:34
	program = (GnomeProgram *) 0x8064e49
	context = (GOptionContext *) 0xb7ed16e4
	retval = <value optimized out>
#39 0xb71e88cc in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
#40 0x080502c1 in _start ()
No symbol table info available.
#0  0xffffe410 in __kernel_vsyscall ()


JCB