Xorg crashed with SIGABRT in OsAbort()

no more infomation about the crash

ProblemType: Crash
DistroRelease: Ubuntu 15.04
Package: xserver-xorg-core 2:1.16.2.901-1ubuntu3
ProcVersionSignature: Ubuntu 3.18.0-11.12-generic 3.18.3
Uname: Linux 3.18.0-11-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] È una directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 304.125 Mon Dec 1 19:58:28 PST 2014
 GCC version: gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu2)
.tmp.unity.support.test.0:

ApportVersion: 2.15.1-0ubuntu4
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CrashCounter: 1
Date: Thu Jan 29 16:42:07 2015
DistUpgraded: Fresh install
DistroCodename: vivid
DistroVariant: ubuntu
DkmsStatus: nvidia-304, 304.125, 3.18.0-11-generic, x86_64: installed
ExecutablePath: /usr/bin/Xorg
GraphicsCard:
 NVIDIA Corporation GF116 [GeForce GT 545] [10de:1243] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Micro-Star International Co., Ltd. [MSI] Device [1462:2315]
InstallationDate: Installed on 2015-01-25 (4 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150124)
MachineType: Packard Bell BV iXtreme J9630
ProcCmdline: /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
ProcEnviron:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.18.0-11-generic root=UUID=d65af345-ca66-4251-9303-fb4570409887 ro quiet splash
Signal: 6
SourcePackage: nvidia-graphics-drivers
StacktraceTop:
 OsAbort ()
 ?? ()
 FatalError ()
 ?? ()
 __libc_start_main (main=0x7fe039112750, argc=11, argv=0x7fffd9ae5588, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffd9ae5578) at libc-start.c:287
Title: Xorg crashed with SIGABRT in OsAbort()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

dmi.bios.date: 02/05/2007
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: W7301VP2.308
dmi.board.name: Cuba MS-7301
dmi.board.vendor: Packard Bell BV
dmi.board.version: 1.0
dmi.chassis.type: 3
dmi.chassis.vendor: Packard Bell BV
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvrW7301VP2.308:bd02/05/2007:svnPackardBellBV:pniXtremeJ9630:pvrPB81105306:rvnPackardBellBV:rnCubaMS-7301:rvr1.0:cvnPackardBellBV:ct3:cvr:
dmi.product.name: iXtreme J9630
dmi.product.version: PB81105306
dmi.sys.vendor: Packard Bell BV
version.compiz: compiz 1:0.9.12.0+15.04.20141219-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.58-2
version.libgl1-mesa-dri: libgl1-mesa-dri 10.4.2-2ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.4.2-2ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.16.2.901-1ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
xserver.bootTime: Thu Jan 29 16:50:17 2015
xserver.configfile: default
xserver.errors: open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.16.2.901-1ubuntu3