compiz crashed with SIGSEGV in PluginClassHandler<UnityWindow, CompWindow, 0>::get()

[Mario Vukelic]

I switched between windows. IIRC first with Alt+Tab, then Alt+Shift. I think I hit the wrong keys and became a bit confused and annoyed (I was in a hurry), and hit Alt+Shift (I think) very quickly. Maybe I also hit both Tab and Shift at the same time, not sure. The Alt+Shift switcher suddenly got stuck and the display became not responsive. Then I got the compiz crash message. It recovered well without losing the X session though.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: unity 4.10.2-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-9.14-generic 3.0.3
Uname: Linux 3.0.0-9-generic x86_64
NonfreeKernelModules: nvidia wl
Architecture: amd64
CrashCounter: 1
Date: Sat Aug 27 19:55:06 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/compiz
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64+mac (20110422)
ProcCmdline: compiz
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x7fd9f6164e4a <_ZN18PluginClassHandlerI11UnityWindow10CompWindowLi0EE3getEPS1_+378>: mov 0x30(%r12),%rax
 PC (0x7fd9f6164e4a) ok
 source "0x30(%r12)" (0x00000030) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity
StacktraceTop:
 PluginClassHandler<UnityWindow, CompWindow, 0>::get(CompWindow*) () from /usr/lib/compiz/libunityshell.so
 UnityScreen::paintDisplay(CompRegion const&, GLMatrix const&, unsigned int) () from /usr/lib/compiz/libunityshell.so
 UnityWindow::glDraw(GLMatrix const&, GLFragment::Attrib&, CompRegion const&, unsigned int) () from /usr/lib/compiz/libunityshell.so
 GLWindow::glDraw(GLMatrix const&, GLFragment::Attrib&, CompRegion const&, unsigned int) () from /usr/lib/compiz/libopengl.so
 GLWindow::glPaint(GLWindowPaintAttrib const&, GLMatrix const&, CompRegion const&, unsigned int) () from /usr/lib/compiz/libopengl.so
Title: compiz crashed with SIGSEGV in PluginClassHandler<UnityWindow, CompWindow, 0>::get()
UpgradeStatus: Upgraded to oneiric on 2011-08-18 (9 days ago)
UserGroups: adm admin audio cdrom dialout dip fuse lpadmin netdev plugdev powerdev sambashare tape video

[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 #832979, 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.