unity-panel-service crashed with SIGSEGV in g_type_check_instance_cast()

[fain182]

Crashed while i was on dropbox indicator, hovering "Recently change files".
(Dropbox was uploading new files.)

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: unity-services 4.22.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
ApportVersion: 1.23-0ubuntu3
Architecture: i386
CheckboxSubmission: 2fca08263ded7c02d98f21fb8710ba12
CheckboxSystem: bb422ca46d02494cdbc459927a98bc2f
CompizPlugins: [core,bailer,detection,composite,opengl,decor,regex,mousepoll,compiztoolbox,move,gnomecompat,animation,snap,imgpng,expo,place,session,vpswitch,unitymtgrabhandles,grid,resize,wall,ezoom,fade,workarounds,scale,scaleaddon,unityshell]
Date: Mon Oct 17 20:47:36 2011
ExecutablePath: /usr/lib/unity/unity-panel-service
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcCmdline: /usr/lib/unity/unity-panel-service
ProcEnviron:
 SHELL=/bin/zsh
 PATH=(custom, no user)
 LANG=it_IT.UTF-8
SegvAnalysis:
 Segfault happened at: 0x64d198 <g_type_check_instance_cast+56>: mov (%eax),%ebp
 PC (0x0064d198) ok
 source "(%eax)" (0x00000020) not located in a known VMA region (needed readable region)!
 destination "%ebp" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 g_type_check_instance_cast () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/libdbusmenu-gtk3.so.4
 ?? () from /usr/lib/libdbusmenu-gtk3.so.4
 ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
 g_main_contehostname_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
Title: unity-panel-service crashed with SIGSEGV in g_type_check_instance_cast()
UpgradeStatus: Upgraded to oneiric on 2011-10-13 (4 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors:
 (nautilus:1841): Gtk-CRITICAL **: gtk_action_set_visible: assertion `GTK_IS_ACTION (action)' failed
 (nautilus:1841): Gtk-CRITICAL **: gtk_action_set_visible: assertion `GTK_IS_ACTION (action)' failed
 (dropbox:1861): Gdk-CRITICAL **: IA__gdk_window_thaw_toplevel_updates_libgtk_only: assertion `private->update_and_descendants_freeze_count > 0' failed

[Apport retracing service (apport)]

StacktraceTop:
 g_type_check_instance_cast (type_instance=0x9dd6318, iface_type=80) at /build/buildd/glib2.0-2.30.0/./gobject/gtype.c:3985
 menu_item_is_activating (mi=<optimized out>) at /build/buildd/libdbusmenu-0.5.0/./libdbusmenu-gtk/client.c:478
 close_in_idle (mi=0x9dd6318) at /build/buildd/libdbusmenu-0.5.0/./libdbusmenu-gtk/client.c:568
 g_idle_dispatch (source=0x9e822f0, callback=0x1e32b00 <close_in_idle>, user_data=0x9dd6318) at /build/buildd/glib2.0-2.30.0/./glib/gmain.c:4801
 g_main_dispatch (context=0x9992ed8) at /build/buildd/glib2.0-2.30.0/./glib/gmain.c:2441

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Michael Terry (mterry)]

This looks to me because we set up an idle callback but don't cancel it if the object is destroyed out from under us. Patch coming.

[Barneedhar (barneedhar)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug #851954, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.