Xorg crashed with SIGABRT in OsAbort()

[Roger]

Up-to-date 15.10, gnome-shell 3.18 from the gnome3-staging repo, nvidia-355 from the graphics-drivers repo.

ProblemType: Crash
DistroRelease: Ubuntu 15.10
Package: xserver-xorg-core 2:1.17.2-1ubuntu9
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-15-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 355.11 Wed Aug 26 16:35:41 PDT 2015
 GCC version: gcc version 5.2.1 20151003 (Ubuntu 5.2.1-21ubuntu2)
ApportVersion: 2.19.1-0ubuntu2
Architecture: amd64
CrashCounter: 1
CurrentDesktop: GNOME
Date: Sat Oct 10 06:52:43 2015
DistUpgraded: 2015-08-15 14:01:43,980 DEBUG enabling apt cron job
DistroCodename: wily
DistroVariant: ubuntu
ExecutablePath: /usr/bin/Xorg
GraphicsCard:
 NVIDIA Corporation GF108M [GeForce GT 425M] [10de:0df0] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Sony Corporation Device [104d:907a]
InstallationDate: Installed on 2015-03-30 (197 days ago)
InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Beta amd64 (20150329)
MachineType: Sony Corporation VPCF13Z1E
ProcCmdline: /usr/bin/X vt7 -displayfd 3 -auth /run/user/121/gdm/Xauthority -nolisten tcp -background none -noreset -keeptty -verbose 3
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=55189574-16e8-43f3-b5aa-3e7c2ce8770c ro quiet splash
Signal: 6
SourcePackage: xorg-server
StacktraceTop:
 OsAbort ()
 FatalError ()
 ?? ()
 xf86CloseConsole ()
 ddxGiveUp ()
Title: Xorg crashed with SIGABRT in OsAbort()
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: Upgraded to wily on 2015-08-15 (59 days ago)
UserGroups:

dmi.bios.date: 08/08/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: R0170Y9
dmi.board.asset.tag: N/A
dmi.board.name: VAIO
dmi.board.vendor: Sony Corporation
dmi.board.version: N/A
dmi.chassis.asset.tag: N/A
dmi.chassis.type: 10
dmi.chassis.vendor: Sony Corporation
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrR0170Y9:bd08/08/2010:svnSonyCorporation:pnVPCF13Z1E:pvrC606AQTZ:rvnSonyCorporation:rnVAIO:rvrN/A:cvnSonyCorporation:ct10:cvrN/A:
dmi.product.name: VPCF13Z1E
dmi.product.version: C606AQTZ
dmi.sys.vendor: Sony Corporation
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
xserver.bootTime: Wed Oct 14 10:18:05 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: 2:1.17.2-1ubuntu9

[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 #1237904, 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.