compiz crashed with SIGSEGV in XDefineCursor()

[Achim Behrens]

uptodate 12.04 on dell vostro 1500 laptop with second monitor on external vga, nvidia 8600gtm with nvidia-current.
Using Unity in twinview mode.

Xserver crashes several times a day when moving the mouse from the right (external) monitor to the left (laptop) monitor. at the edge between the both monitors the launcher should pop out and i need to scroll "with some pressure" to get to the left screen.
now with the mouse (or when trying to drag&drop a window to the other screen) at the time when i hit the edge the Xserver restarts.

it happens several times a day while regularly using the system (browsing, IRC, Libreoffice,email etc). but i cant reproduce it on purpose.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: compiz-core 1:0.9.7.0~bzr2995-0ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-17.26-generic 3.2.6
Uname: Linux 3.2.0-17-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Ist ein Verzeichnis: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 295.20 Mon Feb 6 21:07:30 PST 2012
 GCC version: gcc-Version 4.6.2 (Ubuntu/Linaro 4.6.2-14ubuntu2)
.tmp.unity.support.test.0:

ApportVersion: 1.92-0ubuntu1
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,resize,imgpng,move,mousepoll,grid,vpswitch,gnomecompat,regex,wall,animation,expo,place,snap,session,fade,ezoom,workarounds,scale,unityshell]
CompositorRunning: compiz
CrashCounter: 1
Date: Wed Feb 22 20:37:01 2012
DistUpgraded: Log time: 2012-02-04 21:34:45.359729
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus:
 nvidia-current, 295.20, 3.2.0-16-generic, x86_64: installed
 nvidia-current, 295.20, 3.2.0-17-generic, x86_64: installed
DuplicateOf: https://bugs.launchpad.net/bugs/938730
ExecutablePath: /usr/bin/compiz
GraphicsCard:
 NVIDIA Corporation G84 [GeForce 8600M GT] [10de:0407] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:0228]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
JockeyStatus:
 firmware:dvb_usb - Firmware für DVB-Karten (Proprietär, Aktiviert, In Benutzung)
 xorg:nvidia_current - Beschleunigter Grafiktreiber von NVIDIA (Proprietär, Aktiviert, In Benutzung)
 xorg:nvidia_current_updates - NVIDIAs beschleunigte Grafiktreiber (Nachträgliche Aktualisierungen) (Proprietär, Deaktiviert, Nicht benutzt)
MachineType: Dell Inc. Vostro 1500
ProcCmdline: compiz
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-17-generic root=UUID=a3766369-3632-4939-b6f1-b2f4101b1cd5 ro quiet splash vt.handoff=7
SegvAnalysis:
 Segfault happened at: 0x7fb569e8aa46 <XDefineCursor+22>: mov 0x968(%rdi),%rax
 PC (0x7fb569e8aa46) ok
 source "0x968(%rdi)" (0x00000968) not located in a known VMA region (needed readable region)!
 destination "%rax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 XDefineCursor () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 CompScreenImpl::~CompScreenImpl() () from /usr/lib/libcompiz_core.so.ABI-20120216
 CompScreenImpl::~CompScreenImpl() () from /usr/lib/libcompiz_core.so.ABI-20120216
 CompManager::init() ()
 main ()
Title: compiz crashed with SIGSEGV in XDefineCursor()
UpgradeStatus: Upgraded to precise on 2012-02-16 (6 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 04/21/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A06
dmi.board.name: 0WY040
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA06:bd04/21/2008:svnDellInc.:pnVostro1500:pvr:rvnDellInc.:rn0WY040:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Vostro 1500
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.7.0~bzr2995-0ubuntu4
version.ia32-libs: ia32-libs 20090808ubuntu33
version.libdrm2: libdrm2 2.4.30-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0~rc2-0ubuntu5
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0~rc2-0ubuntu5
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.99.901+git20120126-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #932024, 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.

[Achim Behrens (k1l)]

this reported bug may be duplicated to this:

https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/938677

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.