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

[Jean-Baptiste Lallement]

TEST CASE:
1. Open the sound menu
2. Press the mouse button on the volume slider and hold it down to initiate a drag
3. Move the mouse pointer over another indicator (e.g Calendar)

Result:
This crash.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: unity-services 4.20.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
ApportVersion: 1.23-0ubuntu2
Architecture: i386
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]
CrashCounter: 1
Date: Mon Oct 3 09:41:12 2011
ExecutablePath: /usr/lib/unity/unity-panel-service
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110209)
ProcCmdline: /usr/lib/unity/unity-panel-service
SegvAnalysis:
 Segfault happened at: 0x1fb588 <g_type_check_instance+8>: call 0x1d0df7 <__i686.get_pc_thunk.bx>
 PC (0x001fb588) ok
 source "0x1d0df7" (0x001d0df7) ok
 destination "(%esp)" (0xbf684000) 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:
 g_type_check_instance (type_instance=0x98df010) at /build/buildd/glib2.0-2.30.0/./gobject/gtype.c:4051
 g_signal_emit_valist (instance=0x98df010, signal_id=18, detail=0, var_args=0xbf68417c "") at /build/buildd/glib2.0-2.30.0/./gobject/gsignal.c:2936
 g_signal_emit (instance=0x98df010, signal_id=18, detail=0) at /build/buildd/glib2.0-2.30.0/./gobject/gsignal.c:3060
 ?? () from /usr/lib/libgtk-3.so.0
 ?? () from /usr/lib/libgtk-3.so.0
Title: unity-panel-service crashed with SIGSEGV in g_type_check_instance()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors:
 (nautilus:1600): Gtk-CRITICAL **: gtk_action_set_visible: assertion `GTK_IS_ACTION (action)' failed
 (nautilus:1600): Gtk-CRITICAL **: gtk_action_set_visible: assertion `GTK_IS_ACTION (action)' failed
 (indicator-weather:1603): libappindicator-WARNING **: Unable to connect to the Notification Watcher: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name :1.75 was not provided by any .service files

[Launchpad Janitor (janitor)]

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

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #847495, so 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. Please continue to report any other bugs you may find.

[Launchpad Janitor (janitor)]

This bug was fixed in the package ido - 0.3.0-0ubuntu2

---------------
ido (0.3.0-0ubuntu2) oneiric; urgency=low

  * src/idorange.c
    - cherry picked fix from Michal Hruby for a crasher in
      IdoRange (LP: #865122)
 -- Ken VanDine <email address hidden> Mon, 03 Oct 2011 11:08:59 -0400

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu laptop testing tracker.

A list of all reports related to this bug can be found here:
http://laptop.qa.ubuntu.com/qatracker/reports/bugs/865122