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I upgraded my system to 12.04 today.  After reboot and login, my desktop
initially displayed then a slow black screen wash happened from top to
bottom.  I waited several seconds and eventually the desktop came back
with no panel or launcher.  I received a crash popup and tried to send
it, but the crash reporting process never completed.

I was able to restart X and login using the 2d desktop.  The following is an 
excerpt from a crash file in /var/crash  I can send the entire crash file if 
needed  it is over 7mb.:
SegvAnalysis:
 Segfault happened at: 0x7fd4a957b7e5 <_wordcopy_fwd_aligned+181>:      mov    
(%rsi),%rax
 PC (0x7fd4a957b7e5) ok
 source "(%rsi)" (0x7fd486ce3800) not located in a known VMA region (needed 
readable region)!
 destination "%rax" ok
SegvReason: reading unknown VMA
SourcePackage: unity
Stacktrace:
 #0  _wordcopy_fwd_aligned (dstp=59130960, srcp=140550771456000, len=640) at 
wordcopy.c:80
         a0 = <optimized out>
         a1 = <optimized out>
 #1  0x00007fd4a9575635 in __memmove_sse2 (dest=0x3864450, src=<optimized out>, 
len=5120) at ../string/memmove.c:76
         dstp = <optimized out>
         srcp = <optimized out>
 #2  0x00007fd49c7f9753 in ?? () from 
/usr/lib/nvidia-current/libnvidia-glcore.so.295.40
 No symbol table info available.
 #3  0x00007fd49c7fa482 in ?? () from 
/usr/lib/nvidia-current/libnvidia-glcore.so.295.40
 No symbol table info available.
 #4  0x00007fd49c805e04 in ?? () from 
/usr/lib/nvidia-current/libnvidia-glcore.so.295.40
 No symbol table info available.
 #5  0x00007fd49c806551 in ?? () from 
/usr/lib/nvidia-current/libnvidia-glcore.so.295.40
 No symbol table info available.
 #6  0x00007fd49c903656 in ?? () from 
/usr/lib/nvidia-current/libnvidia-glcore.so.295.40
 No symbol table info available.
 #7  0x00007fd49c62166c in ?? () from 
/usr/lib/nvidia-current/libnvidia-glcore.so.295.40
 No symbol table info available.
 #8  0x00007fd49dd3ef1f in GLWindow::glDrawGeometry() () from 
/usr/lib/compiz/libopengl.so
 No symbol table info available.
 #9  0x00007fd49dd3ef91 in GLWindow::glDrawGeometry() () from 
/usr/lib/compiz/libopengl.so
 No symbol table info available.
 #10 0x00007fd49dd4160e in GLWindow::glDrawTexture(GLTexture*, 
GLFragment::Attrib&, unsigned int) () from /usr/lib/compiz/libopengl.so
 No symbol table info available.
 #11 0x00007fd49dd40b58 in GLWindow::glDrawTexture(GLTexture*, 
GLFragment::Attrib&, unsigned int) () from /usr/lib/compiz/libopengl.so
 No symbol table info available.
 #12 0x00007fd49dd41927 in GLWindow::glDraw(GLMatrix const&, 
GLFragment::Attrib&, CompRegion const&, unsigned int) () from 
/usr/lib/compiz/libopengl.so
 No symbol table info available.
 #13 0x00007fd4969aca99 in UnityMTGrabHandlesWindow::glDraw(GLMatrix const&, 
GLFragment::Attrib&, CompRegion const&, unsigned int) () from 
/usr/lib/compiz/libunitymtgrabhandles.so

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: compiz 1:0.9.7.6-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  295.40  Thu Apr  5 21:37:00 
PDT 2012
 GCC version:  gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
.tmp.unity.support.test.0:
 
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,compiztoolbox,decor,resize,regex,move,imgpng,snap,gnomecompat,grid,place,mousepoll,vpswitch,animation,wall,unitymtgrabhandles,expo,ezoom,session,fade,workarounds,scale,unityshell]
CompositorRunning: None
Date: Sat May  5 14:59:25 2012
DistUpgraded: 2012-05-05 14:14:58,086 DEBUG enabling apt cron job
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus:
 nvidia-current, 295.40, 3.0.0-17-generic, x86_64: installed
 nvidia-current, 295.40, 3.2.0-24-generic, x86_64: installed
 vboxhost, 4.0.4, 2.6.38-11-generic, x86_64: installed
 vboxhost, 4.0.4, 3.0.0-17-generic, x86_64: installed
 vboxhost, 4.0.4, 3.2.0-24-generic, x86_64: installed
GraphicsCard:
 NVIDIA Corporation C51G [GeForce 6100] [10de:0242] (rev a2) (prog-if 00 [VGA 
controller])
   Subsystem: Micro-Star International Co., Ltd. Device [1462:7207]
JockeyStatus:
 xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, 
Enabled, In use)
 xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release 
updates) (Proprietary, Disabled, Not in use)
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 002: ID 051d:0002 American Power Conversion Uninterruptible 
Power Supply
 Bus 002 Device 003: ID 058f:9360 Alcor Micro Corp. 8-in-1 Media Card Reader
MachineType: Gateway T6534
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-24-generic 
root=UUID=f6af97d1-9ee3-4edc-9a70-7e02129362cc ro quiet splash vt.handoff=7
SourcePackage: compiz
UpgradeStatus: Upgraded to precise on 2012-05-05 (0 days ago)
dmi.bios.date: 03/10/2006
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080012
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: MS-7207G
dmi.board.vendor: To be filled by O.E.M.
dmi.board.version: 100
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr080012:bd03/10/2006:svnGateway:pnT6534:pvrC00:rvnTobefilledbyO.E.M.:rnMS-7207G:rvr100:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: T6534
dmi.product.version: C00
dmi.sys.vendor: Gateway
version.compiz: compiz 1:0.9.7.6-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu35
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
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 N/A

** Affects: nvidia-graphics-drivers (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug precise regression-update ubuntu
-- 
compiz crashed with SIGSEGV in _wordcopy_fwd_aligned() from __memmove_sse2() 
from ? /usr/lib/nvidia-current/libnvidia-glcore.so.295.40
https://bugs.launchpad.net/bugs/995239
You received this bug notification because you are a member of Ubuntu-X, which 
is subscribed to nvidia-graphics-drivers in Ubuntu.

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