Xorg crashed with SIGABRT in OsAbort()

[ramon]

system was upgraded from ubuntu 1310.

 VGA compatible controller: NVIDIA Corporation GT218 [GeForce 210] (rev a2)

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: xserver-xorg-core 2:1.15.0-1ubuntu7
ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
Uname: Linux 3.13.0-19-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
Date: Sun Mar 23 18:42:01 2014
ExecutablePath: /usr/bin/Xorg
InstallationDate: Installed on 2013-10-21 (156 days ago)
InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Beta amd64 (20130925.1)
ProcCmdline: /usr/bin/X -core :1 -seat seat0 -auth /var/run/lightdm/root/:1 -nolisten tcp vt8 -novtswitch
ProcEnviron:

Signal: 6
SourcePackage: xorg-server
StacktraceTop:
 OsAbort ()
 ?? ()
 FatalError ()
 ?? () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so
 ?? () from /usr/lib/x86_64-linux-gnu/xorg/extra-modules/nvidia_drv.so
Title: Xorg crashed with SIGABRT in OsAbort()
UpgradeStatus: Upgraded to trusty on 2014-03-04 (21 days ago)
UserGroups:

[Apport retracing service (apport)]

StacktraceTop:
 OsAbort () at ../../os/utils.c:1324
 AbortServer () at ../../os/log.c:773
 FatalError (f=0x7f6942111e50 <Address 0x7f6942111e50 out of bounds>) at ../../os/log.c:911
 ?? ()
 ?? ()

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.