Xorg crashed with SIGSEGV in point_on_screen from miPointerSetPosition from positionSprite from positionSprite from fill_pointer_events

[ubername]

https://errors.ubuntu.com/problem/26998ca1a748ac33e8d1e0fe7d2bb9555465f34c

occasional screen locks up, the session ends, reverts to display manager (lightdm?), have to log in again.

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: xserver-xorg-core 2:1.19.5-0ubuntu2
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
.tmp.unity_support_test.0:

ApportVersion: 2.20.8-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: GNOME
Date: Mon Nov 20 09:11:46 2017
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
DkmsStatus: virtualbox, 5.2.0, 4.13.0-16-generic, x86_64: installed
ExecutablePath: /usr/lib/xorg/Xorg
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Dell Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [1028:05a4]
InstallationDate: Installed on 2014-08-13 (1194 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140810)
MachineType: Dell Inc. OptiPlex 9020
ProcCmdline: /usr/lib/xorg/Xorg vt2 -displayfd 3 -auth /run/user/1000/gdm/Xauthority -background none -noreset -keeptty -verbose 3
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic root=UUID=e2d4a833-d4fd-4295-95a5-57c52551e6ba ro splash vt.handoff=7
SegvAnalysis:
 Segfault happened at: 0x56286fd4bad0: movswl 0x8(%rdi),%ecx
 PC (0x56286fd4bad0) ok
 source "0x8(%rdi)" (0x00000008) not located in a known VMA region (needed readable region)!
 destination "%ecx" ok
 Stack memory exhausted (SP below stack segment)
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: xorg-server
StacktraceTop:
 ()
 miPointerSetPosition ()
 ()
 ()
 GetPointerEvents ()
Title: Xorg crashed with SIGSEGV
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip libvirt lpadmin lxd plugdev sambashare sudo
dmi.bios.date: 05/23/2017
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A20
dmi.board.name: 06X1TJ
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA20:bd05/23/2017:svnDellInc.:pnOptiPlex9020:pvr00:rvnDellInc.:rn06X1TJ:rvrA00:cvnDellInc.:ct6:cvr:
dmi.product.name: OptiPlex 9020
dmi.product.version: 00
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.13.1+18.04.20171116-0ubuntu1
version.libdrm2: libdrm2 2.4.88-1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.2-0ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.2-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.5-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20170309-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
xserver.bootTime: Tue Sep 12 12:13:51 2017
xserver.configfile: default
xserver.errors:
 /dev/dri/card0: failed to set DRM interface version 1.4: Permission denied
 /dev/dri/card0: failed to set DRM interface version 1.4: Permission denied
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.19.3-1ubuntu6
xserver.video_driver: modeset

[Launchpad Janitor (janitor)]

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

[Wes (wesinator)]

How is this only Medium importance ?

This causes a crash that forces a hard log-out, closing running applications and losing unsaved work.
That is unacceptable for a stable LTS system (Ubuntu 18.04.1 LTS).

[DarkTrick (darktrick1337)]

3 years later.
I support Wes's statement about the importance of the bug. This is a real dealbreaker.

I cannot write any short notes, no unsaved emails, temporary documents, draw temporary images, because I use my OS in constant fear it might break down out of a sudden.