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

[Christoph B]

unity-panel-service crashed when changing the audio volume on the panel.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: unity-services 4.12.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-9.15-generic 3.0.3
Uname: Linux 3.0.0-9-generic x86_64
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: compiz
CrashCounter: 1
Date: Sat Sep 3 09:57:07 2011
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
ExecutablePath: /usr/lib/unity/unity-panel-service
GraphicsCard:
 ATI Technologies Inc RV730 PRO [Radeon HD 4650] [1002:9498] (prog-if 00 [VGA controller])
   Subsystem: Giga-byte Technology Device [1458:21c5]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901)
MachineType: Unknow Unknow
ProcCmdline: /usr/lib/unity/unity-panel-service
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANGUAGE=de_AT:de
 LANG=de_AT.UTF-8
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-9-generic root=UUID=7813ba8e-6c01-4c2a-8892-c1238735c177 ro quiet splash vt.handoff=7
SegvAnalysis:
 Segfault happened at: 0x7f25cd9829c4 <gtk_widget_get_mapped+4>: callq 0x7f25cd97ff80 <gtk_widget_get_type>
 PC (0x7f25cd9829c4) ok
 source "0x7f25cd97ff80" (0x7f25cd97ff80) ok
 destination "(%rsp)" (0x7ffff1c98000) not located in a known VMA region (needed writable region)!
 Stack memory exhausted (SP below stack segment)
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 gtk_widget_get_mapped () from /usr/lib/libgtk-3.so.0
 ?? () from /usr/lib/libgtk-3.so.0
 ?? () from /usr/lib/libgtk-3.so.0
 ?? () from /usr/lib/libgtk-3.so.0
 ?? () from /usr/lib/libgtk-3.so.0
Title: unity-panel-service crashed with SIGSEGV in gtk_widget_get_mapped()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XorgConf:

dmi.bios.date: 12/08/2008
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: 6.00 PG
dmi.board.name: RS690-SB600
dmi.board.version: Unknow
dmi.chassis.type: 3
dmi.chassis.vendor: Unknow
dmi.chassis.version: Unknow
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd12/08/2008:svnUnknow:pnUnknow:pvrUnknow:rvn:rnRS690-SB600:rvrUnknow:cvnUnknow:ct3:cvrUnknow:
dmi.product.name: Unknow
dmi.product.version: Unknow
dmi.sys.vendor: Unknow
version.compiz: compiz 1:0.9.5.92+bzr2791-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu20
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

[Apport retracing service (apport)]

StacktraceTop:
 gtk_widget_get_mapped (widget=0x1a95030) at /build/buildd/gtk+3.0-3.1.12/./gtk/gtkwidget.c:7456
 _gtk_widget_list_devices (widget=0x1a95030) at /build/buildd/gtk+3.0-3.1.12/./gtk/gtkwidget.c:10989
 gtk_grab_notify_foreach (child=0x1a95030, data=0x7ffff1c981d0) at /build/buildd/gtk+3.0-3.1.12/./gtk/gtkmain.c:2123
 gtk_grab_notify_foreach (child=0x1991480, data=0x7ffff1c981d0) at /build/buildd/gtk+3.0-3.1.12/./gtk/gtkmain.c:2114
 gtk_menu_shell_forall (container=<optimized out>, include_internals=<optimized out>, callback=0x7f25cd838060 <gtk_grab_notify_foreach>, callback_data=0x7ffff1c981d0) at /build/buildd/gtk+3.0-3.1.12/./gtk/gtkmenushell.c:1243