Xorg crashed with SIGABRT in OsAbort()

[Stefan Pappalardo]

Since yesterday the issue ocurred once a day.
It results to a full freeze of the system.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: xserver-xorg-core-hwe-16.04 2:1.19.3-1ubuntu1~16.04.4
ProcVersionSignature: Ubuntu 4.10.0-42.46~16.04.1-generic 4.10.17
Uname: Linux 4.10.0-42-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.14
Architecture: amd64
CrashCounter: 1
Date: Thu Dec 28 15:42:51 2017
ExecutablePath: /usr/lib/xorg/Xorg
ExecutableTimestamp: 1507904252
ProcCmdline: /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
ProcCwd: /
ProcEnviron:

Signal: 6
SourcePackage: xorg-server-hwe-16.04
StacktraceTop:
 OsAbort ()
 ?? ()
 FatalError ()
 ?? ()
 __libc_start_main (main=0x55a454a722f0, argc=11, argv=0x7fff63727e08, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff63727df8) at ../csu/libc-start.c:291
Title: Xorg crashed with SIGABRT in OsAbort()
UpgradeStatus: Upgraded to xenial on 2016-08-06 (509 days ago)
UserGroups: mythtv