compiz crashed with SIGSEGV in unity::decoration::Window::Impl::UpdateDecorationTextures()

[dinamic]

i didn't do nothing special to trigger this bug... i was just coding in Qt Creator when Unity crashed/self restarted? and so on..

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: unity 7.1.2+14.04.20140217-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-8.28-generic 3.13.2
Uname: Linux 3.13.0-8-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.13.2-0ubuntu4
Architecture: i386
CurrentDesktop: Unity
Date: Tue Feb 18 17:40:48 2014
ExecutablePath: /usr/bin/compiz
InstallationDate: Installed on 2012-04-30 (659 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0xb0ed8990 <_ZN5unity10decoration6Window4Impl24UpdateDecorationTexturesEv+416>: mov (%eax),%edx
 PC (0xb0ed8990) ok
 source "(%eax)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%edx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 unity::decoration::Window::Impl::UpdateDecorationTextures() () from /usr/lib/compiz/libunityshell.so
 unity::decoration::Window::UpdateDecorationPosition() () from /usr/lib/compiz/libunityshell.so
 unity::UnityWindow::windowNotify(CompWindowNotify) () from /usr/lib/compiz/libunityshell.so
 CompWindow::windowNotify(CompWindowNotify) () from /usr/lib/libcompiz_core.so.ABI-20140123
 CompWindow::map() () from /usr/lib/libcompiz_core.so.ABI-20140123
Title: compiz crashed with SIGSEGV in unity::decoration::Window::Impl::UpdateDecorationTextures()
UpgradeStatus: Upgraded to trusty on 2014-02-02 (16 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 unity::decoration::Window::Impl::UpdateDecorationTextures (this=0x9a42d10) at /build/buildd/unity-7.1.2+14.04.20140217/decorations/DecoratedWindow.cpp:410
 unity::decoration::Window::UpdateDecorationPosition (this=0x9a3b280) at /build/buildd/unity-7.1.2+14.04.20140217/decorations/DecoratedWindow.cpp:607
 unity::UnityWindow::windowNotify (this=0x9a3b188, n=CompWindowNotifyMap) at /build/buildd/unity-7.1.2+14.04.20140217/plugins/unityshell/src/unityshell.cpp:3025
 CompWindow::windowNotify (this=0x8f4b6a0, n=CompWindowNotifyMap) at /build/buildd/compiz-0.9.11+14.04.20140217/src/window.cpp:2219
 CompWindow::map (this=0x8f4b6a0) at /build/buildd/compiz-0.9.11+14.04.20140217/src/window.cpp:1356

[Launchpad Janitor (janitor)]

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