compiz assert failure: compiz: /usr/include/boost/smart_ptr/shared_ptr.hpp:418: T* boost::shared_ptr<T>::operator->() const [with T = UnityFBO]: Assertion `px != 0' failed.

[Arkaitz Jimenez]

I was trying to enable twinview when the error happened.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: unity 4.18.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic-pae 3.0.4
Uname: Linux 3.0.0-12-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu1
Architecture: i386
AssertionMessage: compiz: /usr/include/boost/smart_ptr/shared_ptr.hpp:418: T* boost::shared_ptr<T>::operator->() const [with T = UnityFBO]: Assertion `px != 0' failed.
CrashCounter: 1
Date: Tue Sep 27 17:30:58 2011
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcCmdline: compiz
ProcEnviron:
 PATH=(custom, user)
 LANG=en_IE.UTF-8
 SHELL=/bin/bash
Signal: 6
SourcePackage: unity
StacktraceTop:
 __GI___assert_fail (assertion=0xb3de3819 "px != 0", file=0xb3de3974 "/usr/include/boost/smart_ptr/shared_ptr.hpp", line=418, function=0xb3dea2c0 "T* boost::shared_ptr<T>::operator->() const [with T = UnityFBO]") at assert.c:81
 ?? () from /usr/lib/compiz/libunityshell.so
 UnityScreen::glPaintOutput(GLScreenPaintAttrib const&, GLMatrix const&, CompRegion const&, CompOutput*, unsigned int) () from /usr/lib/compiz/libunityshell.so
 GLScreen::glPaintOutput(GLScreenPaintAttrib const&, GLMatrix const&, CompRegion const&, CompOutput*, unsigned int) () from /usr/lib/compiz/libopengl.so
 PrivateGLScreen::paintOutputs(std::list<CompOutput*, std::allocator<CompOutput*> >&, unsigned int, CompRegion const&) () from /usr/lib/compiz/libopengl.so
Title: compiz assert failure: compiz: /usr/include/boost/smart_ptr/shared_ptr.hpp:418: T* boost::shared_ptr<T>::operator->() const [with T = UnityFBO]: Assertion `px != 0' failed.
UpgradeStatus: Upgraded to oneiric on 2011-09-26 (1 days ago)
UserGroups: adm admin cdrom dialout libvirtd lpadmin plugdev sambashare
XsessionErrors:
 (Do:14412): Wnck-CRITICAL **: wnck_set_client_type got called multiple times.
 (gwibber-service:14650): libindicate-WARNING **: Menu being changed when the indicator is visible. Listeners will NOT be notified of this change.

[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 #838128, 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.