compiz crashed with SIGSEGV in g_variant_ref_sink()

[Robert Ross]

1) Description: Ubuntu precise (development branch)
Release: 12.04

2) unity:
  Installed: 5.8.0-0ubuntu1
  Candidate: 5.8.0-0ubuntu1
  Version table:
 *** 5.8.0-0ubuntu1 0
        500 http://ca.archive.ubuntu.com/ubuntu/ precise/main i386 Packages
        100 /var/lib/dpkg/status

3) I expected Unity to not crash.

4) It crashed.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: unity 5.8.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-20.32-generic-pae 3.2.12
Uname: Linux 3.2.0-20-generic-pae i686
ApportVersion: 1.95-0ubuntu1
Architecture: i386
Date: Mon Mar 26 13:40:58 2012
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120301)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=en_CA:en
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity
Title: compiz crashed with SIGSEGV in g_variant_unref()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 g_variant_ref_sink (value=0xfffffff9) at /build/buildd/glib2.0-2.32.0/./glib/gvariant-core.c:700
 unity::launcher::SoftwareCenterLauncherIcon::OnPropertyChanged (this=0xb367800, params=0xb0f334a8) at /build/buildd/unity-5.8.0/plugins/unityshell/src/SoftwareCenterLauncherIcon.cpp:69
 operator() (this=0xa3af694, _A_a1=<optimized out>) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1851
 operator()<_GVariant* const&> (this=0xa3af690, _A_arg1=<optimized out>) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:84
 sigc::internal::slot_call1<sigc::bound_mem_functor1<void, unity::launcher::SoftwareCenterLauncherIcon, _GVariant*>, void, _GVariant*>::call_it (rep=0xa3af678, a_1=@0xbfd1b460) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:137

[Launchpad Janitor (janitor)]

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