compiz crashed with SIGSEGV in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string()

[rodgersayshi]

unity:
  Installed: 5.8.0-0ubuntu2
  Candidate: 5.8.0-0ubuntu2
  Version table:
 *** 5.8.0-0ubuntu2 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/main i386 Packages
        100 /var/lib/dpkg/status

Release: 12.04

What you expected to happen: lock my screen
What happened instead: unity crashed

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: unity 5.8.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-20.33-generic-pae 3.2.12
Uname: Linux 3.2.0-20-generic-pae i686
ApportVersion: 2.0.1-0ubuntu1
Architecture: i386
CrashCounter: 1
Date: Wed Apr 11 23:02:46 2012
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120328)
ProcCmdline: compiz
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0xb7633375 <_ZNSsC2ERKSs+21>: mov -0x4(%eax),%edx
 PC (0xb7633375) ok
 source "-0x4(%eax)" (0x00000015) not located in a known VMA region (needed readable region)!
 destination "%edx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&) () from /usr/lib/i386-linux-gnu/libstdc++.so.6
 ?? () from /usr/lib/compiz/libunityshell.so
 unity::UBusManager::OnCallback(_GVariant*, void*) () from /usr/lib/compiz/libunityshell.so
 ?? () from /usr/lib/compiz/libunityshell.so
 ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
Title: compiz crashed with SIGSEGV in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #966150, 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)]

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