[Lucid] wnck-applet crashed with SIGSEGV in g_closure_invoke()

[Sam_]

Binary package hint: gnome-panel

LiveCD session Lucid daily build from 6th of March.
Right click on workspace preferences (wanted to add more workspaces).
Segfault messages appear to reload indicator-, show desktop-, workspace switcher-applet and window list because they've crashed.
Panels didn't crash or disappear.
Then was asked to report this bug.
Unsucessful tried to reproduce the behaviour right now. Workspace preferences occured and I've added two more workspaces without further issues.
Update:
I could reproduce the behaviour every LiveCD session (currently three times now), after the first failure of workspace preferences and reloading as requested it works and allows to add more workspaces.
Thanks.

ProblemType: Crash
Architecture: amd64
Date: Sat Mar 6 21:29:56 2010
DistroRelease: Ubuntu 10.04
ExecutablePath: /usr/lib/gnome-panel/wnck-applet
LiveMediaBuild: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100306)
Package: gnome-panel 1:2.29.91-0ubuntu2
ProcCmdline: /usr/lib/gnome-panel/wnck-applet --oaf-activate-iid=OAFIID:GNOME_Wncklet_Factory --oaf-ior-fd=18
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-15.22-generic
SegvAnalysis:
 Segfault happened at: 0x405ab9: mov (%rbx),%rax
 PC (0x00405ab9) ok
 source "(%rbx)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-panel
StacktraceTop:
 ?? ()
 ?? ()
 g_closure_invoke ()
 bonobo_closure_invoke_va_list ()
 bonobo_closure_invoke ()
Title: wnck-applet crashed with SIGSEGV in g_closure_invoke()
Uname: Linux 2.6.32-15-generic x86_64
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors:
 (polkit-gnome-authentication-agent-1:3548): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (gnome-appearance-properties:3822): Gdk-CRITICAL **: gdk_display_sync: assertion `GDK_IS_DISPLAY (display)' failed
 (gnome-appearance-properties:3822): Gdk-CRITICAL **: gdk_display_sync: assertion `GDK_IS_DISPLAY (display)' failed

[Apport retracing service (apport)]

StacktraceTop:
 wncklet_connect_while_alive (object=0x0, signal=0x40b862 "royed",
 display_properties_dialog (
 g_closure_invoke ()
 bonobo_closure_invoke_va_list (
 ?? ()

[Pedro Villavicencio (pedro)]

Thanks for the bug report. This particular bug has already been reported into our bug tracking system, but please feel free to report any further bugs you find.