Xorg crashed with SIGABRT in OsAbort()

[Lacyc3]

Xubuntu 14.10
Xorg version: 1:7.7+7ubuntu2
Xserver-xorg-core version: 2:1.16.0-1ubuntu1.2
Kernel: 3.16.0-28-generic #38-Ubuntu

Reproduce:
echo 1 | sudo tee /proc/sys/kernel/sysrq
Push: altgr+printscr+k

I expected that Xorg restarts normally, but it crashed.

ProblemType: Crash
DistroRelease: Ubuntu 14.10
Package: xserver-xorg-core 2:1.16.0-1ubuntu1.2
ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
Uname: Linux 3.16.0-28-generic x86_64
ApportVersion: 2.14.7-0ubuntu8
Architecture: amd64
Date: Fri Jan 2 23:05:17 2015
ExecutablePath: /usr/bin/Xorg
ExecutableTimestamp: 1418166202
InstallationDate: Installed on 2014-12-22 (11 days ago)
InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
ProcCmdline: /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
ProcCwd: /etc/X11
ProcEnviron:

Signal: 6
SourcePackage: xorg-server
StacktraceTop:
 OsAbort ()
 ?? ()
 FatalError ()
 ?? ()
 __libc_start_main (main=0x7f0676841740, argc=11, argv=0x7fff8bc77d28, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff8bc77d18) at libc-start.c:287
Title: Xorg crashed with SIGABRT in OsAbort()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Launchpad Janitor (janitor)]

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

[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 #1338492, 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.