gnome-shell crashed with SIGSEGV in meta_window_is_on_primary_monitor()

[Cimdrap]

gnome-shell crash after today's update

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: gnome-shell 3.3.90-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
Date: Thu Mar 15 12:21:21 2012
ExecutablePath: /usr/bin/gnome-shell
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcCmdline: /usr/bin/gnome-shell
ProcEnviron:
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7fc546f7bd34 <meta_window_is_on_primary_monitor+4>: mov 0x14(%rax),%eax
 PC (0x7fc546f7bd34) ok
 source "0x14(%rax)" (0x00000014) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-shell
StacktraceTop:
 meta_window_is_on_primary_monitor () from /usr/lib/libmutter.so.0
 meta_window_update_on_all_workspaces () from /usr/lib/libmutter.so.0
 ?? () from /usr/lib/libmutter.so.0
 ?? () from /usr/lib/libmutter.so.0
 ?? () from /usr/lib/libmutter.so.0
Title: gnome-shell crashed with SIGSEGV in meta_window_is_on_primary_monitor()
UpgradeStatus: Upgraded to precise on 2012-03-12 (3 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Cimdrap (giosaci)]

after a forced reboot it works again

[Apport retracing service (apport)]

StacktraceTop:
 meta_window_is_on_primary_monitor (window=0x2eca570) at core/window.c:3627
 should_be_on_all_workspaces (window=0x2eca570) at core/window.c:1910
 should_be_on_all_workspaces (window=0x2eca570) at core/window.c:10669
 meta_window_update_on_all_workspaces (window=0x2eca570) at core/window.c:1920
 prefs_changed_callback (data=0x2eca570, pref=<optimized out>) at core/window.c:197

[Launchpad Janitor (janitor)]

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

[Jeremy Bícha (jbicha)]

Thank you for reporting this bug to Ubuntu. Ubuntu 12.04 LTS reached End of Life in April. See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases

Please upgrade to Ubuntu 16.04 LTS and re-test. If the bug is still reproducible, increase the verbosity of the steps to recreate it so we can try again.

I apologize that we are not always to respond to bug reports promptly. Do feel free to report any other bugs you may find.