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.

[Martin Pool]

was fiddling with my external monitor configuration trying to get it to work, and compiz apparently crashed.

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 x86_64
ApportVersion: 1.23-0ubuntu2
Architecture: amd64
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 Oct 4 17:50:12 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcCmdline: compiz
Signal: 6
SourcePackage: unity
StacktraceTop:
 __GI___assert_fail (assertion=0x7fbe49af412c "px != 0", file=<optimized out>, line=418, function=<optimized out>) 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 2011-09-05 (28 days ago)
UserGroups: adm admin cdrom dialout libvirtd lpadmin plugdev sambashare
XsessionErrors:
 (gnome-settings-daemon:3570): GnomeDesktop-CRITICAL **: gnome_rr_crtc_get_gamma: assertion `crtc != NULL' failed
 (gnome-settings-daemon:3570): GnomeDesktop-CRITICAL **: gnome_rr_crtc_get_gamma: assertion `crtc != NULL' failed
 (gnome-settings-daemon:3570): GnomeDesktop-CRITICAL **: gnome_rr_crtc_get_gamma: assertion `crtc != NULL' failed
 (Do:3621): Wnck-CRITICAL **: wnck_set_client_type got called multiple times.

[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.