gnome-panel crashed with SIGSEGV in gtk_widget_destroy()

[miked]

Ubuntu 12.10 QQ Alpha 3

guest@DellLatD630FreekLap:~$ lsb_release -rd
Description: Ubuntu quantal (development branch)
Release: 12.10
guest@DellLatD630FreekLap:~$

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: gnome-panel 1:3.5.4-0ubuntu2
ProcVersionSignature: Ubuntu 3.5.0-10.10-generic 3.5.1
Uname: Linux 3.5.0-10-generic i686
ApportVersion: 2.4-0ubuntu8
Architecture: i386
CrashCounter: 1
Date: Tue Aug 21 15:39:05 2012
ExecutablePath: /usr/bin/gnome-panel
ProcCmdline: gnome-panel
SegvAnalysis:
 Segfault happened at: 0xb74cc24f: mov 0x50(%eax),%edx
 PC (0xb74cc24f) ok
 source "0x50(%eax)" (0xaaaaaafa) not located in a known VMA region (needed readable region)!
 destination "%edx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: gnome-panel
StacktraceTop:
 ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0
 gtk_container_forall () from /usr/lib/i386-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0
Title: gnome-panel crashed with SIGSEGV in gtk_container_forall()
UpgradeStatus: Upgraded to quantal on 2012-08-08 (13 days ago)
UserGroups: nopasswdlogin

[Apport retracing service (apport)]

StacktraceTop:
 gtk_widget_destroy (widget=0xb76d4000) at /build/buildd/gtk+3.0-3.5.12/./gtk/gtkwidget.c:3954
 gtk_widget_class_init (klass=0x8cae538) at /build/buildd/gtk+3.0-3.5.12/./gtk/gtkwidget.c:1079
 gtk_window_accessible_get_extents (component=0x8cde930, x=0x0, y=0x0, width=0xb6da3087, height=0x8b7f640, coord_type=ATK_XY_SCREEN) at /build/buildd/gtk+3.0-3.5.12/./gtk/a11y/gtkwindowaccessible.c:308
 g_closure_invoke (closure=0x40000007, return_value=0xb6dc9054, n_param_values=1, param_values=0xb6de8000, invocation_hint=0x8baec98) at /build/buildd/glib2.0-2.33.10/./gobject/gclosure.c:786
 ?? ()