compiz assert failure: compiz: /usr/include/boost/smart_ptr/shared_ptr.hpp:418: T* boost::shared_ptr<T>::operator->() const [with T = UnityFBO]: Zusicherung »px != 0« nicht erfüllt.

[Felix]

Crashed while i tried to use a 2nd monitor. That try failed and i tried to get my single screen back with Fn+F8 (screen switch/toggle on my laptop keyboard). That was the moment where the crash occured. My window decorater + unity was gone also.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: unity 4.14.2-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-11.17-generic 3.0.4
Uname: Linux 3.0.0-11-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu1
Architecture: amd64
AssertionMessage: compiz: /usr/include/boost/smart_ptr/shared_ptr.hpp:418: T* boost::shared_ptr<T>::operator->() const [with T = UnityFBO]: Zusicherung »px != 0« nicht erfüllt.
CrashCounter: 1
Date: Wed Sep 14 17:12:31 2011
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
ProcCmdline: compiz
Signal: 6
SourcePackage: unity
StacktraceTop:
 raise () from /lib/x86_64-linux-gnu/libc.so.6
 abort () from /lib/x86_64-linux-gnu/libc.so.6
 __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
 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
Title: compiz assert failure: compiz: /usr/include/boost/smart_ptr/shared_ptr.hpp:418: T* boost::shared_ptr<T>::operator->() const [with T = UnityFBO]: Zusicherung »px != 0« nicht erfüllt.
UpgradeStatus: Upgraded to oneiric on 2011-09-12 (1 days ago)
UserGroups: adm admin cdrom dialout icecast lpadmin plugdev sambashare vboxusers

[Apport retracing service (apport)]

StacktraceTop:
 __GI___assert_fail (assertion=0x7fe1cabd6bcc "px != 0", file=<optimized out>, line=418, function=<optimized out>) at assert.c:81
 operator-> (this=<optimized out>) at /usr/include/boost/smart_ptr/shared_ptr.hpp:418
 operator-> (this=<optimized out>) at /build/buildd/unity-4.14.2/plugins/unityshell/src/unityshell.cpp:2247
 glPaintOutput (this=<optimized out>, attrib=<optimized out>, transform=<optimized out>, region=<optimized out>, output=<optimized out>, mask=<optimized out>) at /build/buildd/unity-4.14.2/plugins/unityshell/src/unityshell.cpp:750
 UnityScreen::glPaintOutput (this=0x272d6d0, attrib=..., transform=..., region=..., output=0x509bfd0, mask=3) at /build/buildd/unity-4.14.2/plugins/unityshell/src/unityshell.cpp:741

[Bilal Akhtar (bilalakhtar)]

Assigning to Neil, please re-assign as appropriate

[Thomi Richards (thomir-deactivatedaccount)]

I've had a quick look at this, and it seems to be a timing issue with regards to removing a monitor. It is possible that Sam's proposed changes to the compiz framebuffer will fix this issue.