Xorg crashed with SIGABRT in OsAbort()

[TheByteSmasher]

upon boot

ProblemType: Crash
DistroRelease: Ubuntu 15.04
Package: xserver-xorg-core 2:1.16.2.901-1ubuntu4
Uname: Linux 4.0.0-040000rc1-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.16.2-0ubuntu2
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: Mon Mar 9 19:10:16 2015
DistUpgraded: Fresh install
DistroCodename: vivid
DistroVariant: ubuntu
ExecutablePath: /usr/bin/Xorg
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:04b8]
 NVIDIA Corporation GF106M [GeForce GT 555M] [10de:0dcd] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:04b8]
InstallationDate: Installed on 2015-02-25 (12 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20150225)
MachineType: Dell Inc. Dell System XPS L702X
ProcCmdline: /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
ProcEnviron:

ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.0.0-040000rc1-generic root=UUID=9926f78a-e78e-4da2-8c45-43610f6e99e7 ro quiet splash vt.handoff=7
Signal: 6
SourcePackage: xorg-server
StacktraceTop:
 OsAbort ()
 ?? ()
 FatalError ()
 CreateWellKnownSockets ()
 ?? ()
Title: Xorg crashed with SIGABRT in OsAbort()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

dmi.bios.date: 09/07/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A19
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 0XN71K
dmi.board.vendor: Dell Inc.
dmi.board.version: FAB1
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnDellInc.:bvrA19:bd09/07/2012:svnDellInc.:pnDellSystemXPSL702X:pvr:rvnDellInc.:rn0XN71K:rvrFAB1:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Dell System XPS L702X
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.12.1+15.04.20150303-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.59-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.0-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.0-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.16.2.901-1ubuntu4
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: Mon Mar 9 20:37:53 2015
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 730
 vendor LGD
xserver.version: 2:1.16.2.901-1ubuntu4

[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 #1429927, 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.