compiz crashed with SIGSEGV in PrivateWindow::addWindowStackChanges()

[Colin Church]

Compiz crashed straight after log-in
This is the 11.10 version

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: unity 4.18.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu2
Architecture: i386
CrashCounter: 1
Date: Thu Sep 29 10:41:09 2011
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcCmdline: compiz --sm-client-id 10593f42d64460e212131710634781907200000013720053
SegvAnalysis:
 Segfault happened at: 0x808420a <_ZN13PrivateWindow21addWindowStackChangesEP14XWindowChangesP10CompWindow+42>: mov 0x34(%edx),%ebx
 PC (0x0808420a) ok
 source "0x34(%edx)" (0x00000034) not located in a known VMA region (needed readable region)!
 destination "%ebx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 PrivateWindow::addWindowStackChanges(XWindowChanges*, CompWindow*) ()
 CompWindow::lower() ()
 CompScreen::handleEvent(_XEvent*) ()
 PrivateCompositeScreen::handleEvent(_XEvent*) () from /usr/lib/compiz/libcomposite.so
 CompScreen::handleEvent(_XEvent*) ()
Title: compiz crashed with SIGSEGV in PrivateWindow::addWindowStackChanges()
UpgradeStatus: Upgraded to oneiric on 2011-09-27 (1 days ago)
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[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #861542, 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.