compiz crashed with SIGSEGV in _XFreeEventCookies()

[martinbures]

I had several terminals(with ssh sessions), firefox, and gedit running. I was leaving for the day and had closed all windows except for one terminal. When I attempted to close the last terminal, this event occurred.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: compiz-core 1:0.9.5.94+bzr2803-0ubuntu5
ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
Uname: Linux 3.0.0-11-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 1.23-0ubuntu1
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,move,regex,snap,vpswitch,resize,compiztoolbox,grid,gnomecompat,place,mousepoll,wall,imgpng,animation,expo,workarounds,fade,session,scale,ezoom,unitymtgrabhandles,unityshell]
CompositorRunning: compiz
Date: Tue Sep 20 17:28:21 2011
DistUpgraded: Log time: 2011-08-30 16:43:23.986495
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 4.1.2, 3.0.0-10-generic, x86_64: installed
 virtualbox, 4.1.2, 3.0.0-11-generic, x86_64: installed
 virtualbox, 4.1.2, 3.0.0-9-generic, x86_64: installed
ExecutablePath: /usr/bin/compiz
GraphicsCard:
 ATI Technologies Inc NI Seymour [AMD Radeon HD 6470M] [1002:6760] (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:161e]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
MachineType: Hewlett-Packard HP EliteBook 8460p
ProcCmdline: compiz
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-11-generic root=UUID=929588a1-a2e5-4119-b84b-d58f9fd0155c ro quiet splash vt.handoff=7
SegvAnalysis:
 Segfault happened at: 0x7fd30ef7a4f3 <_XFreeEventCookies+19>: mov 0x40(%rax),%rbp
 PC (0x7fd30ef7a4f3) ok
 source "0x40(%rax)" (0x00001290) not located in a known VMA region (needed readable region)!
 destination "%rbp" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 _XFreeEventCookies () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 XNextEvent () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 PrivateScreen::processEvents() ()
 CompEventSource::callback() ()
 Glib::Source::dispatch_vfunc(_GSource*, int (*)(void*), void*) () from /usr/lib/libglibmm-2.4.so.1
Title: compiz crashed with SIGSEGV in _XFreeEventCookies()
UpgradeStatus: Upgraded to oneiric on 2011-09-13 (7 days ago)
UserGroups: adm admin cdrom dialout fuse lpadmin plugdev sambashare
dmi.bios.date: 04/27/2011
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68SCF Ver. F.03
dmi.board.name: 161C
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 97.40
dmi.chassis.asset.tag: CNU13232ZY
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68SCFVer.F.03:bd04/27/2011:svnHewlett-Packard:pnHPEliteBook8460p:pvrA0001D02:rvnHewlett-Packard:rn161C:rvrKBCVersion97.40:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 8460p
dmi.product.version: A0001D02
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.5.94+bzr2803-0ubuntu5
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

[martinbures (needemesleepe)]

Additionally, I had virtualbox running. I have had a lot of problems with virtualbox + firefox + terminals with respect to selection of active windows and tiling of windows.

[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 #851472, 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.