compiz crashed with SIGSEGV in main_arena()

[Chris Glass]

I seems to have crashed when coming back from a lock screen (i.e., the screen was locked, and it crashed right after unlock).

Please let me know if/how I can help any further.

# lsb_release -rd
Description: Ubuntu Saucy Salamander (development branch)
Release: 13.10

ProblemType: Crash
DistroRelease: Ubuntu 13.10
Package: unity 7.1.0+13.10.20130920-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-8.15-generic 3.11.1
Uname: Linux 3.11.0-8-generic x86_64
ApportVersion: 2.12.4-0ubuntu1
Architecture: amd64
CrashCounter: 1
Date: Tue Sep 24 12:59:26 2013
ExecutablePath: /usr/bin/compiz
InstallationDate: Installed on 2013-07-23 (62 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
ProcCmdline: compiz
SegvAnalysis:
 Segfault happened at: 0x7f21947f3bc8 <main_arena+1160>: and %bl,0x2(%rbp,%rdx,4)
 PC (0x7f21947f3bc8) in non-executable VMA region: 0x7f21947f3000-0x7f21947f5000 rw-p /lib/x86_64-linux-gnu/libc-2.17.so
 source "%bl" ok
 destination "0x2(%rbp,%rdx,4)" (0x01ff3292) ok
SegvReason: executing writable VMA /lib/x86_64-linux-gnu/libc-2.17.so
Signal: 11
SourcePackage: unity
StacktraceTop:
 main_arena () from /lib/x86_64-linux-gnu/libc.so.6
 unity::ui::EdgeBarrierController::Impl::SetupBarriers(std::vector<nux::Rect, std::allocator<nux::Rect> > const&) () from /usr/lib/compiz/libunityshell.so
 ?? () from /usr/lib/compiz/libunityshell.so
 unity::glib::Source::SourceCallback(void*) () from /usr/lib/libunity-core-6.0.so.7
 g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
Title: compiz crashed with SIGSEGV in main_arena()
UpgradeStatus: Upgraded to saucy on 2013-07-27 (58 days ago)
UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 main_arena () from /tmp/apport_sandbox_by86rR/lib/x86_64-linux-gnu/libc.so.6
 unity::ui::EdgeBarrierController::Impl::SetupBarriers (this=0x1ff2530, layout=...) at /build/buildd/unity-7.1.0+13.10.20130920/launcher/EdgeBarrierController.cpp:204
 emit (impl=0x2032430) at /usr/include/sigc++-2.0/sigc++/signal.h:776
 emit (this=<optimized out>) at /usr/include/sigc++-2.0/sigc++/signal.h:2673
 operator() (__closure=<optimized out>) at /build/buildd/unity-7.1.0+13.10.20130920/launcher/LauncherOptions.cpp:52