gnome-screensaver crashed with SIGSEGV in XGetScreenSaver()

[Reiner Jung]

I did not see any crash, but the system reported it.

ProblemType: Crash
DistroRelease: Ubuntu 17.10
Package: gnome-screensaver 3.6.1-7ubuntu6
ProcVersionSignature: Ubuntu 4.12.0-13.14-generic 4.12.10
Uname: Linux 4.12.0-12-generic x86_64
ApportVersion: 2.20.7-0ubuntu1
Architecture: amd64
AssertionMessage: '\177
CurrentDesktop: ubuntu:GNOME
Date: Sun Sep 17 22:18:00 2017
ExecutablePath: /usr/bin/gnome-screensaver
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
GsettingsGnomeSession:
 org.gnome.desktop.session session-name 'gnome'
 org.gnome.desktop.session idle-delay uint32 0
InstallationDate: Installed on 2015-10-16 (704 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
ProcCmdline: /usr/bin/gnome-screensaver --no-daemon
Signal: 11
SourcePackage: gnome-screensaver
StacktraceTop:
 XGetScreenSaver () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 ?? ()
 ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
 ?? ()
ThreadStacktrace:
 warning: Couldn't find general-purpose registers in core file.
 PC register is not available
Title: gnome-screensaver crashed with SIGSEGV in XGetScreenSaver()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip docker docker-registry lpadmin lxd plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 XGetScreenSaver (dpy=0x252f5f6900, timeout=timeout@entry=0x7ffd7901ed48, interval=interval@entry=0x7ffd7901ed4c, prefer_blanking=prefer_blanking@entry=0x7ffd7901ed50, allow_exp=allow_exp@entry=0x7ffd7901ed54) at ../../src/GetSSaver.c:44
 disable_builtin_screensaver (unblank_screen=0, watcher=<optimized out>) at gs-watcher-x11.c:539
 watchdog_timer (watcher=<optimized out>) at gs-watcher-x11.c:609
 g_timeout_dispatch (source=0x252f5f6900, callback=0x7ffd7901ed48, user_data=0x7ffd7901ed4c) at ../../../../glib/gmain.c:4622
 ?? ()
ThreadStacktrace:
 warning: Couldn't find general-purpose registers in core file.
 PC register is not available