*** This bug is a duplicate of bug 1724439 ***
    https://bugs.launchpad.net/bugs/1724439

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 #1724439, 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.

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** This bug has been marked a duplicate of bug 1724439
   gnome-shell crashed with SIGSEGV in meta_window_get_monitor() from 
ffi_call_unix64() from ffi_call() from gjs_invoke_c_function() from 
function_call()

** Tags removed: need-amd64-retrace

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https://bugs.launchpad.net/bugs/1742540

Title:
  gnome-shell crashed with SIGSEGV in meta_window_get_monitor()

Status in gnome-shell package in Ubuntu:
  New

Bug description:
  Artful (17.10) Session logout after screen turned off

  Whenever I turn off my screen, the computer (a desktop PC) logs me out
  of my session.

  ProblemType: Crash
  DistroRelease: Ubuntu 17.10
  Package: gnome-shell 3.26.2-0ubuntu0.1
  ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
  Uname: Linux 4.13.0-21-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CrashCounter: 1
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Jan  9 18:08:20 2018
  DisplayManager: gdm3
  ExecutablePath: /usr/bin/gnome-shell
  ExecutableTimestamp: 1510175942
  GsettingsChanges:
   b'org.gnome.shell' b'enabled-extensions' 
b"['[email protected]']"
   b'org.gnome.shell' b'favorite-apps' b"['google-chrome.desktop', 
'firefox.desktop', 'org.gnome.gedit.desktop', 'rhythmbox.desktop', 
'org.gnome.Nautilus.desktop', 'update-manager.desktop', 
'org.gnome.Software.desktop', 'org.gnome.Terminal.desktop', 
'plexmediamanager.desktop', 'gnome-system-monitor.desktop', 
'transmission-gtk.desktop']"
   b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
   b'org.gnome.desktop.interface' b'icon-theme' b"'Numix-Square'"
   b'org.gnome.desktop.interface' b'gtk-theme' b"'Arc-Darker'"
  InstallationDate: Installed on 2017-12-03 (37 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
  ProcCmdline: /usr/bin/gnome-shell
  ProcCwd: /home/tux
  ProcEnviron:
   LANGUAGE=pt_BR:pt:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=pt_BR.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x7f97ba3992d4 <meta_window_get_monitor+4>:    mov    
0x18(%rax),%eax
   PC (0x7f97ba3992d4) ok
   source "0x18(%rax)" (0x00000018) not located in a known VMA region (needed 
readable region)!
   destination "%eax" ok
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: gnome-shell
  StacktraceTop:
   meta_window_get_monitor () from /usr/lib/x86_64-linux-gnu/libmutter-1.so.0
   ffi_call_unix64 () from /usr/lib/x86_64-linux-gnu/libffi.so.6
   ffi_call () from /usr/lib/x86_64-linux-gnu/libffi.so.6
   ?? () from /usr/lib/libgjs.so.0
   ?? () from /usr/lib/libgjs.so.0
  Title: gnome-shell crashed with SIGSEGV in meta_window_get_monitor()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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