compiz crashed with SIGSEGV in g_data_set_internal()

[Martin Albisetti]

Crashed when unplugging an external monitor.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: libnux-2.0-0 2.0.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-12.20-generic-pae 3.2.2
Uname: Linux 3.2.0-12-generic-pae i686
ApportVersion: 1.91-0ubuntu1
Architecture: i386
CrashCounter: 1
Date: Mon Jan 30 12:11:06 2012
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcCmdline: compiz
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0xb700bb9b <g_datalist_id_set_data_full+411>: cmp (%eax),%edi
 PC (0xb700bb9b) ok
 source "(%eax)" (0xacb00008) not located in a known VMA region (needed readable region)!
 destination "%edi" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: nux
StacktraceTop:
 g_datalist_id_set_data_full () from /lib/i386-linux-gnu/libglib-2.0.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/libunity-misc.so.4
 g_object_unref () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
Title: compiz crashed with SIGSEGV in g_datalist_id_set_data_full()
UpgradeStatus: Upgraded to precise on 2011-12-02 (59 days ago)
UserGroups: adm admin cdrom dialout libvirtd lpadmin plugdev sambashare

[Apport retracing service (apport)]

StacktraceTop:
 g_data_set_internal (dataset=0x0, new_destroy_func=0, new_data=0xaaaaaab0, key_id=53, datalist=0x892e548) at /build/buildd/glib2.0-2.31.12/./glib/gdataset.c:376
 g_datalist_id_set_data_full (datalist=0x892e548, key_id=53, data=0x0, destroy_func=0) at /build/buildd/glib2.0-2.31.12/./glib/gdataset.c:680
 g_object_real_dispose (object=0x892e540) at /build/buildd/glib2.0-2.31.12/./gobject/gobject.c:1001
 ?? ()
 ?? ()

[Launchpad Janitor (janitor)]

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

[Robert Roth (evfool)]

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 #917311, 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.