Xorg crashed with SIGABRT in mieqMoveToNewScreen()

[Muelli]

I actually didn't do anything special. I think..

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: xserver-xorg-core 2:1.13.3-0ubuntu6.2
ProcVersionSignature: Ubuntu 3.8.0-27.40-generic 3.8.13.4
Uname: Linux 3.8.0-27-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.9.2-0ubuntu8.5
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
Date: Tue Jan 14 15:43:13 2014
DistUpgraded: Fresh install
DistroCodename: raring
DistroVariant: ubuntu
DkmsStatus:
 vboxguest, 4.3.0, 3.8.0-27-generic, x86_64: installed
 virtualbox-guest, 4.2.10, 3.8.0-27-generic, x86_64: installed (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!) (WARNING! Diff between built and installed module!)
DpkgLog:

ExecutablePath: /usr/bin/Xorg
ExtraDebuggingInterest: Yes
GraphicsCard: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter [80ee:beef] (prog-if 00 [VGA controller])
InstallationDate: Installed on 2013-06-18 (210 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
Lsusb:
 Bus 001 Device 004: ID 80ee:0021 VirtualBox USB Tablet
 Bus 001 Device 005: ID 058f:6387 Alcor Micro Corp. Flash Drive
 Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: innotek GmbH VirtualBox
MarkForUpload: True
ProcCmdline: /usr/bin/X :0 -background none -verbose -auth /run/gdm/auth-for-gdm-8RsI8f/database -nolisten tcp vt7
ProcEnviron:
 LANG=en_US.UTF-8
 TERM=linux
 PATH=(custom, no user)
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-27-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
Renderer: Software
Signal: 6
SourcePackage: xorg-server
StacktraceTop:
 ?? ()
 mieqProcessDeviceEvent ()
 mieqProcessInputEvents ()
 ProcessInputEvents ()
 xf86Wakeup ()
Title: Xorg crashed with SIGABRT in mieqProcessDeviceEvent()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.board.name: VirtualBox
dmi.board.vendor: Oracle Corporation
dmi.board.version: 1.2
dmi.chassis.type: 1
dmi.chassis.vendor: Oracle Corporation
dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH
version.compiz: compiz 1:0.9.9~daily13.06.19~13.04-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.46-1ubuntu0.1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.1.7-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.1.7-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu6.2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.6-0ubuntu4.3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.7-0ubuntu1
xserver.bootTime: Tue Jan 14 15:43:55 2014
xserver.configfile: default
xserver.errors:
 AIGLX error: vboxvideo does not export required DRI extension
 AIGLX: reverting to software rendering
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.13.3-0ubuntu6.2
xserver.video_driver: vboxvideo

[Apport retracing service (apport)]

StacktraceTop:
 mieqMoveToNewScreen (screen=0x7fd1b8247b60, dev=0x7fd1b8424b40, event=<optimized out>) at ../../mi/mieq.c:490
 mieqMoveToNewScreen (dev=0x7fd1b8424b40, screen=0x7fd1b8247b60, event=<optimized out>, event=<optimized out>) at ../../mi/mieq.c:488
 mieqProcessDeviceEvent (dev=dev@entry=0x7fd1b8424b40, event=event@entry=0x7fd1b65478c0 <event.15397>, screen=screen@entry=0x7fd1b8247b60) at ../../mi/mieq.c:526
 mieqProcessInputEvents () at ../../mi/mieq.c:623
 ProcessInputEvents () at ../../../../hw/xfree86/common/xf86Events.c:164