Public bug reported:

I'm getting similar random lockups with a up-to-date Edgy as Bug #68403
however I have no panel applets running at all (other bug suspects Java
panel applets may be causing issue).

Backtrace during lockup:

$ gdb -p 20213
GNU gdb 6.4.90-debian
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
Attaching to process 20213
Reading symbols from /usr/bin/gnome-panel...Reading symbols from 
/usr/lib/debug/usr/bin/gnome-panel...done.
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
done.
Reading symbols from /usr/lib/liblaunchpad-integration.so.0...done.
Loaded symbols for /usr/lib/liblaunchpad-integration.so.0
Reading symbols from /usr/lib/libgnome-desktop-2.so.2...done.
Loaded symbols for /usr/lib/libgnome-desktop-2.so.2
Reading symbols from /usr/lib/libgnomeui-2.so.0...done.
Loaded symbols for /usr/lib/libgnomeui-2.so.0
Reading symbols from /usr/lib/libbonoboui-2.so.0...done.
Loaded symbols for /usr/lib/libbonoboui-2.so.0
Reading symbols from /usr/lib/libgnomecanvas-2.so.0...done.
Loaded symbols for /usr/lib/libgnomecanvas-2.so.0
Reading symbols from /usr/lib/libgnome-2.so.0...done.
Loaded symbols for /usr/lib/libgnome-2.so.0
Reading symbols from /usr/lib/libart_lgpl_2.so.2...done.
Loaded symbols for /usr/lib/libart_lgpl_2.so.2
Reading symbols from /usr/lib/libbonobo-2.so.0...done.
Loaded symbols for /usr/lib/libbonobo-2.so.0
Reading symbols from /usr/lib/libbonobo-activation.so.4...done.
Loaded symbols for /usr/lib/libbonobo-activation.so.4
Reading symbols from /usr/lib/libgnomevfs-2.so.0...done.
Loaded symbols for /usr/lib/libgnomevfs-2.so.0
Reading symbols from /usr/lib/libglade-2.0.so.0...done.
Loaded symbols for /usr/lib/libglade-2.0.so.0
Reading symbols from /usr/lib/libgtk-x11-2.0.so.0...done.
Loaded symbols for /usr/lib/libgtk-x11-2.0.so.0
Reading symbols from /usr/lib/libgdk-x11-2.0.so.0...done.
Loaded symbols for /usr/lib/libgdk-x11-2.0.so.0
Reading symbols from /usr/lib/libatk-1.0.so.0...done.
Loaded symbols for /usr/lib/libatk-1.0.so.0
Reading symbols from /usr/lib/libgdk_pixbuf-2.0.so.0...done.
Loaded symbols for /usr/lib/libgdk_pixbuf-2.0.so.0
Reading symbols from /usr/lib/libpango-1.0.so.0...done.
Loaded symbols for /usr/lib/libpango-1.0.so.0
Reading symbols from /usr/lib/libcairo.so.2...done.
Loaded symbols for /usr/lib/libcairo.so.2
Reading symbols from /usr/lib/libgobject-2.0.so.0...done.
Loaded symbols for /usr/lib/libgobject-2.0.so.0
Reading symbols from /usr/lib/libgconf-2.so.4...done.
Loaded symbols for /usr/lib/libgconf-2.so.4
Reading symbols from /usr/lib/libORBit-2.so.0...done.
Loaded symbols for /usr/lib/libORBit-2.so.0
Reading symbols from /lib/tls/i686/cmov/libm.so.6...done.
Loaded symbols for /lib/tls/i686/cmov/libm.so.6
Reading symbols from /usr/lib/libgnome-menu.so.2...done.
Loaded symbols for /usr/lib/libgnome-menu.so.2
Reading symbols from /usr/lib/libdbus-glib-1.so.2...done.
Loaded symbols for /usr/lib/libdbus-glib-1.so.2
Reading symbols from /usr/lib/libglib-2.0.so.0...done.
Loaded symbols for /usr/lib/libglib-2.0.so.0
Reading symbols from /usr/lib/libX11.so.6...done.
Loaded symbols for /usr/lib/libX11.so.6
Reading symbols from /lib/tls/i686/cmov/libpthread.so.0...done.
[Thread debugging using libthread_db enabled]
[New Thread -1224997200 (LWP 20213)]
Loaded symbols for /lib/tls/i686/cmov/libpthread.so.0
Reading symbols from /lib/tls/i686/cmov/libc.so.6...done.
Loaded symbols for /lib/tls/i686/cmov/libc.so.6
Reading symbols from /usr/lib/libXau.so.6...done.
Loaded symbols for /usr/lib/libXau.so.6
Reading symbols from /usr/lib/libpangocairo-1.0.so.0...done.
Loaded symbols for /usr/lib/libpangocairo-1.0.so.0
Reading symbols from /usr/lib/libfontconfig.so.1...done.
Loaded symbols for /usr/lib/libfontconfig.so.1
Reading symbols from /usr/lib/libXext.so.6...done.
Loaded symbols for /usr/lib/libXext.so.6
Reading symbols from /usr/lib/libXrender.so.1...done.
Loaded symbols for /usr/lib/libXrender.so.1
Reading symbols from /usr/lib/libXinerama.so.1...done.
Loaded symbols for /usr/lib/libXinerama.so.1
Reading symbols from /usr/lib/libXi.so.6...done.
Loaded symbols for /usr/lib/libXi.so.6
Reading symbols from /usr/lib/libXrandr.so.2...done.
Loaded symbols for /usr/lib/libXrandr.so.2
Reading symbols from /usr/lib/libXcursor.so.1...done.
Loaded symbols for /usr/lib/libXcursor.so.1
Reading symbols from /usr/lib/libXfixes.so.3...done.
Loaded symbols for /usr/lib/libXfixes.so.3
Reading symbols from /usr/lib/libgmodule-2.0.so.0...done.
Loaded symbols for /usr/lib/libgmodule-2.0.so.0
Reading symbols from /lib/tls/i686/cmov/libdl.so.2...done.
Loaded symbols for /lib/tls/i686/cmov/libdl.so.2
Reading symbols from /usr/lib/libSM.so.6...done.
Loaded symbols for /usr/lib/libSM.so.6
Reading symbols from /usr/lib/libICE.so.6...done.
Loaded symbols for /usr/lib/libICE.so.6
Reading symbols from /usr/lib/libgnome-keyring.so.0...done.
Loaded symbols for /usr/lib/libgnome-keyring.so.0
Reading symbols from /usr/lib/libxml2.so.2...done.
Loaded symbols for /usr/lib/libxml2.so.2
Reading symbols from /lib/libpopt.so.0...done.
Loaded symbols for /lib/libpopt.so.0
Reading symbols from /usr/lib/libpangoft2-1.0.so.0...done.
Loaded symbols for /usr/lib/libpangoft2-1.0.so.0
Reading symbols from /usr/lib/libgthread-2.0.so.0...done.
Loaded symbols for /usr/lib/libgthread-2.0.so.0
Reading symbols from /usr/lib/libstartup-notification-1.so.0...done.
Loaded symbols for /usr/lib/libstartup-notification-1.so.0
Reading symbols from /usr/lib/libjpeg.so.62...done.
Loaded symbols for /usr/lib/libjpeg.so.62
Reading symbols from /usr/lib/libesd.so.0...done.
Loaded symbols for /usr/lib/libesd.so.0
Reading symbols from /usr/lib/libaudiofile.so.0...done.
Loaded symbols for /usr/lib/libaudiofile.so.0
Reading symbols from /usr/lib/libORBitCosNaming-2.so.0...done.
Loaded symbols for /usr/lib/libORBitCosNaming-2.so.0
Reading symbols from /usr/lib/libdbus-1.so.3...done.
Loaded symbols for /usr/lib/libdbus-1.so.3
Reading symbols from /usr/lib/libgnutls.so.13...done.
Loaded symbols for /usr/lib/libgnutls.so.13
Reading symbols from /usr/lib/libavahi-glib.so.1...done.
Loaded symbols for /usr/lib/libavahi-glib.so.1
Reading symbols from /usr/lib/libavahi-common.so.3...done.
Loaded symbols for /usr/lib/libavahi-common.so.3
Reading symbols from /usr/lib/libavahi-client.so.3...done.
Loaded symbols for /usr/lib/libavahi-client.so.3
Reading symbols from /lib/tls/i686/cmov/libresolv.so.2...done.
Loaded symbols for /lib/tls/i686/cmov/libresolv.so.2
Reading symbols from /lib/libselinux.so.1...done.
Loaded symbols for /lib/libselinux.so.1
Reading symbols from /lib/tls/i686/cmov/libutil.so.1...done.
Loaded symbols for /lib/tls/i686/cmov/libutil.so.1
Reading symbols from /usr/lib/libfreetype.so.6...done.
Loaded symbols for /usr/lib/libfreetype.so.6
Reading symbols from /usr/lib/libz.so.1...done.
Loaded symbols for /usr/lib/libz.so.1
Reading symbols from /usr/lib/libpng12.so.0...done.
Loaded symbols for /usr/lib/libpng12.so.0
Reading symbols from /lib/tls/i686/cmov/librt.so.1...done.
Loaded symbols for /lib/tls/i686/cmov/librt.so.1
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/tls/i686/cmov/libnsl.so.1...done.
Loaded symbols for /lib/tls/i686/cmov/libnsl.so.1
Reading symbols from /usr/lib/libXdmcp.so.6...done.
Loaded symbols for /usr/lib/libXdmcp.so.6
Reading symbols from /usr/lib/libexpat.so.1...done.
Loaded symbols for /usr/lib/libexpat.so.1
Reading symbols from /usr/lib/libasound.so.2...done.
Loaded symbols for /usr/lib/libasound.so.2
Reading symbols from /usr/lib/libtasn1.so.3...done.
Loaded symbols for /usr/lib/libtasn1.so.3
Reading symbols from /usr/lib/libgcrypt.so.11...done.
Loaded symbols for /usr/lib/libgcrypt.so.11
Reading symbols from /usr/lib/libgpg-error.so.0...done.
Loaded symbols for /usr/lib/libgpg-error.so.0
Reading symbols from /lib/libsepol.so.1...done.
Loaded symbols for /lib/libsepol.so.1
Reading symbols from /lib/tls/i686/cmov/libnss_compat.so.2...done.
Loaded symbols for /lib/tls/i686/cmov/libnss_compat.so.2
Reading symbols from /lib/tls/i686/cmov/libnss_nis.so.2...done.
Loaded symbols for /lib/tls/i686/cmov/libnss_nis.so.2
Reading symbols from /lib/tls/i686/cmov/libnss_files.so.2...done.
Loaded symbols for /lib/tls/i686/cmov/libnss_files.so.2
Reading symbols from /usr/lib/X11/locale/common/xlcUTF8Load.so.2...done.
Loaded symbols for /usr/lib/X11/locale/common/xlcUTF8Load.so.2
Reading symbols from /usr/lib/gconv/ISO8859-1.so...done.
Loaded symbols for /usr/lib/gconv/ISO8859-1.so
Reading symbols from /usr/lib/gtk-2.0/2.10.0/engines/libindustrial.so...done.
Loaded symbols for /usr/lib/gtk-2.0/2.10.0/engines/libindustrial.so
Reading symbols from /usr/lib/pango/1.5.0/modules/pango-basic-fc.so...done.
Loaded symbols for /usr/lib/pango/1.5.0/modules/pango-basic-fc.so
Reading symbols from /usr/lib/gtk-2.0/2.10.0/loaders/svg_loader.so...done.
Loaded symbols for /usr/lib/gtk-2.0/2.10.0/loaders/svg_loader.so
Reading symbols from /usr/lib/librsvg-2.so.2...done.
Loaded symbols for /usr/lib/librsvg-2.so.2
Reading symbols from /usr/lib/libgsf-1.so.114...done.
Loaded symbols for /usr/lib/libgsf-1.so.114
Reading symbols from /usr/lib/libcroco-0.6.so.3...done.
Loaded symbols for /usr/lib/libcroco-0.6.so.3
Reading symbols from /lib/libbz2.so.1.0...done.
Loaded symbols for /lib/libbz2.so.1.0
Reading symbols from /usr/lib/gnome-vfs-2.0/modules/libfile.so...done.
Loaded symbols for /usr/lib/gnome-vfs-2.0/modules/libfile.so
Reading symbols from /lib/libattr.so.1...done.
Loaded symbols for /lib/libattr.so.1
Reading symbols from /lib/libacl.so.1...done.
Loaded symbols for /lib/libacl.so.1
Reading symbols from /usr/lib/libfam.so.0...done.
Loaded symbols for /usr/lib/libfam.so.0
Reading symbols from /usr/lib/bonobo/monikers/libmoniker_std_2.so...done.
Loaded symbols for /usr/lib/bonobo/monikers/libmoniker_std_2.so
Reading symbols from /usr/lib/gnome-panel/libwnck-applet.so...Reading symbols 
from /usr/lib/debug/usr/lib/gnome-panel/libwnck-applet.so...done.
done.
Loaded symbols for /usr/lib/gnome-panel/libwnck-applet.so
Reading symbols from /usr/lib/libpanel-applet-2.so.0...done.
Loaded symbols for /usr/lib/libpanel-applet-2.so.0
Reading symbols from /usr/lib/liblpint-bonobo.so.0...done.
Loaded symbols for /usr/lib/liblpint-bonobo.so.0
Reading symbols from /usr/lib/libwnck-1.so.18...done.
Loaded symbols for /usr/lib/libwnck-1.so.18
Reading symbols from /usr/lib/libXRes.so.1...done.
Loaded symbols for /usr/lib/libXRes.so.1
Reading symbols from 
/usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-png.so...done.
Loaded symbols for /usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-png.so
Reading symbols from 
/usr/lib/gnome-panel/libnotification-area-applet.so...Reading symbols from 
/usr/lib/debug/usr/lib/gnome-panel/libnotification-area-applet.so...done.
done.
Loaded symbols for /usr/lib/gnome-panel/libnotification-area-applet.so
Reading symbols from /usr/lib/gnome-panel/libclock-applet.so...Reading symbols 
from /usr/lib/debug/usr/lib/gnome-panel/libclock-applet.so...done.
done.
Loaded symbols for /usr/lib/gnome-panel/libclock-applet.so
Reading symbols from /usr/lib/libecal-1.2.so.7...done.
Loaded symbols for /usr/lib/libecal-1.2.so.7
Reading symbols from /usr/lib/libedataserverui-1.2.so.8...done.
Loaded symbols for /usr/lib/libedataserverui-1.2.so.8
Reading symbols from /usr/lib/libebook-1.2.so.9...done.
Loaded symbols for /usr/lib/libebook-1.2.so.9
Reading symbols from /usr/lib/libedataserver-1.2.so.7...done.
Loaded symbols for /usr/lib/libedataserver-1.2.so.7
Reading symbols from /usr/lib/libcamel-1.2.so.8...done.
Loaded symbols for /usr/lib/libcamel-1.2.so.8
Reading symbols from /usr/lib/libplds4.so...done.
Loaded symbols for /usr/lib/libplds4.so
Reading symbols from /usr/lib/libplc4.so...done.
Loaded symbols for /usr/lib/libplc4.so
Reading symbols from /usr/lib/libnspr4.so...done.
Loaded symbols for /usr/lib/libnspr4.so
Reading symbols from /usr/lib/libdb-4.4.so...done.
Loaded symbols for /usr/lib/libdb-4.4.so
Reading symbols from /usr/lib/libnss3.so...done.
Loaded symbols for /usr/lib/libnss3.so
Reading symbols from /usr/lib/libsmime3.so...done.
Loaded symbols for /usr/lib/libsmime3.so
Reading symbols from /usr/lib/libssl3.so...done.
Loaded symbols for /usr/lib/libssl3.so
Reading symbols from /usr/lib/libsoftokn3.so...done.
Loaded symbols for /usr/lib/libsoftokn3.so
Reading symbols from /usr/lib/libkrb5.so.3...done.
Loaded symbols for /usr/lib/libkrb5.so.3
Reading symbols from /usr/lib/libk5crypto.so.3...done.
Loaded symbols for /usr/lib/libk5crypto.so.3
Reading symbols from /lib/libcom_err.so.2...done.
Loaded symbols for /lib/libcom_err.so.2
Reading symbols from /usr/lib/libgssapi_krb5.so.2...done.
Loaded symbols for /usr/lib/libgssapi_krb5.so.2
Reading symbols from /usr/lib/libkrb5support.so.0...done.
Loaded symbols for /usr/lib/libkrb5support.so.0
Reading symbols from 
/usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-xpm.so...done.
Loaded symbols for /usr/lib/gtk-2.0/2.10.0/loaders/libpixbufloader-xpm.so
0xffffe410 in __kernel_vsyscall ()
(gdb) thread apply all bt

Thread 1 (Thread -1224997200 (LWP 20213)):
#0  0xffffe410 in __kernel_vsyscall ()
#1  0xb760fd1e in pthread_exit ()
   from /lib/tls/i686/cmov/libc.so.6
#2  0xb75c4eef in fork () from /lib/tls/i686/cmov/libc.so.6
#3  0xb76772d4 in fork ()
   from /lib/tls/i686/cmov/libpthread.so.0
#4  0xb7f6f192 in gnome_gtk_module_info_get ()
   from /usr/lib/libgnomeui-2.so.0
#5  <signal handler called>
#6  0xb759cc64 in free () from /lib/tls/i686/cmov/libc.so.6
#7  0xb759e83f in malloc () from /lib/tls/i686/cmov/libc.so.6
#8  0xb7779ce6 in g_malloc () from /usr/lib/libglib-2.0.so.0
#9  0xb7854120 in ORBit_alloc_string ()
   from /usr/lib/libORBit-2.so.0
#10 0xb7853de9 in CORBA_string_dup ()
   from /usr/lib/libORBit-2.so.0
#11 0xb785804b in ORBit_copy_value_core ()
   from /usr/lib/libORBit-2.so.0
#12 0xb7858539 in ORBit_copy_value ()
   from /usr/lib/libORBit-2.so.0
#13 0xb785858d in CORBA_any__copy ()
   from /usr/lib/libORBit-2.so.0
#14 0xb7867c0c in DynamicAny_DynAny_to_any ()
   from /usr/lib/libORBit-2.so.0
#15 0xb7e2b95a in bonobo_arg_new ()
   from /usr/lib/libbonobo-2.so.0
#16 0xb7e3979f in bonobo_pbclient_set_string ()
   from /usr/lib/libbonobo-2.so.0
#17 0x08084bcb in panel_applet_frame_change_background (
    frame=0x82c15ac, type=PANEL_BACK_NONE)
---Type <return> to continue, or q <return> to quit---
    at panel-applet-frame.c:518
#18 0xb7b2e268 in _gtk_file_system_model_new ()
   from /usr/lib/libgtk-x11-2.0.so.0
#19 0xb7ae441b in gtk_container_foreach ()
   from /usr/lib/libgtk-x11-2.0.so.0
#20 0x0806f86f in panel_back_change (widget=0x812d018, data=0x0)
    at panel.c:191
#21 0xb78c8b29 in g_cclosure_marshal_VOID__VOID ()
   from /usr/lib/libgobject-2.0.so.0
#22 0xb78bb79b in g_closure_invoke ()
   from /usr/lib/libgobject-2.0.so.0
#23 0xb78cbb93 in g_signal_chain_from_overridden ()
   from /usr/lib/libgobject-2.0.so.0
#24 0xb78cd0b7 in g_signal_emit_valist ()
   from /usr/lib/libgobject-2.0.so.0
#25 0xb78cd279 in g_signal_emit ()
   from /usr/lib/libgobject-2.0.so.0
#26 0x08068fc6 in panel_widget_background_changed (
    background=0x812d07c, panel=0x812d018)
    at panel-widget.c:2635
#27 0x08086d6e in panel_background_prepare (
    background=0x812d07c) at panel-background.c:151
#28 0x0806998e in panel_widget_style_set (widget=0x812d018, 
    previous_style=0x8131600) at panel-widget.c:1561
#29 0xb78c8039 in g_cclosure_marshal_VOID__OBJECT ()
   from /usr/lib/libgobject-2.0.so.0
#30 0xb78b9fb9 in g_value_set_boxed ()
   from /usr/lib/libgobject-2.0.so.0
#31 0xb78bb79b in g_closure_invoke ()
   from /usr/lib/libgobject-2.0.so.0
#32 0xb78cc02a in g_signal_chain_from_overridden ()
   from /usr/lib/libgobject-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#33 0xb78cd0b7 in g_signal_emit_valist ()
   from /usr/lib/libgobject-2.0.so.0
#34 0xb78cd279 in g_signal_emit ()
   from /usr/lib/libgobject-2.0.so.0
#35 0xb7c92f50 in gtk_widget_set_usize ()
   from /usr/lib/libgtk-x11-2.0.so.0
#36 0xb7c9313a in gtk_widget_set_usize ()
   from /usr/lib/libgtk-x11-2.0.so.0
#37 0xb7aa549f in gtk_button_box_set_child_size ()
   from /usr/lib/libgtk-x11-2.0.so.0
#38 0xb7ae45fb in gtk_container_forall ()
   from /usr/lib/libgtk-x11-2.0.so.0
#39 0xb7c93129 in gtk_widget_set_usize ()
   from /usr/lib/libgtk-x11-2.0.so.0
#40 0xb7bf5c8b in gtk_table_get_type ()
   from /usr/lib/libgtk-x11-2.0.so.0
#41 0xb7ae45fb in gtk_container_forall ()
   from /usr/lib/libgtk-x11-2.0.so.0
#42 0xb7c93129 in gtk_widget_set_usize ()
   from /usr/lib/libgtk-x11-2.0.so.0
#43 0xb7aa549f in gtk_button_box_set_child_size ()
   from /usr/lib/libgtk-x11-2.0.so.0
#44 0xb7ae45fb in gtk_container_forall ()
   from /usr/lib/libgtk-x11-2.0.so.0
#45 0xb7c93129 in gtk_widget_set_usize ()
   from /usr/lib/libgtk-x11-2.0.so.0
#46 0xb7c9318d in gtk_widget_reset_rc_styles ()
   from /usr/lib/libgtk-x11-2.0.so.0
#47 0xb7bbbe40 in gtk_rc_get_theme_dir ()
   from /usr/lib/libgtk-x11-2.0.so.0
#48 0xb7b42bb1 in gtk_icon_info_get_type ()
   from /usr/lib/libgtk-x11-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#49 0xb7770aa1 in g_source_is_destroyed ()
   from /usr/lib/libglib-2.0.so.0
#50 0xb7772802 in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#51 0xb77757df in g_main_context_check ()
   from /usr/lib/libglib-2.0.so.0
#52 0xb7775b89 in g_main_loop_run ()
   from /usr/lib/libglib-2.0.so.0
#53 0xb7b74574 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#54 0x08061d8c in main (argc=3, argv=0xbfdb3364) at main.c:95
#0  0xffffe410 in __kernel_vsyscall ()

** Affects: gnome-panel (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

-- 
Gnome-panel freezes regularly during use - no applets running
https://launchpad.net/bugs/75057

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