*** This bug is a duplicate of bug 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

** Attachment removed: "CoreDump.gz"

** Attachment removed: "Disassembly.txt"

** Attachment removed: "ProcMaps.txt"

** Attachment removed: "ProcStatus.txt"

** Attachment removed: "Registers.txt"

** Attachment removed: "Stacktrace.txt"

** Attachment removed: "ThreadStacktrace.txt"

** 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 

** Information type changed from Private to Public

** Tags removed: need-amd64-retrace

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  gnome-shell crashed with SIGSEGV in meta_window_get_monitor()

Status in gnome-shell package in Ubuntu:

Bug description:
  If I switch off my monitor or if it goes to sleep, with either Dash To
  Dock or the Ubuntu-flavored version of the plugin will crash and
  refuse to work until I reboot.

  It doesn't seem to happen on Ubuntu 16.04 with gnome-shell and an
  Nvidia graphics card (I tested it with that hardware on another
  system), but seems to exhibit this behavior more often on my Intel
  integrated graphics.

  ProblemType: Crash
  DistroRelease: Ubuntu 18.04
  Package: gnome-shell 3.28.0-0ubuntu5
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  CrashCounter: 1
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Apr 12 16:14:07 2018
  DisplayManager: gdm3
  ExecutablePath: /usr/bin/gnome-shell
   b'org.gnome.shell' b'enabled-extensions' 
b"['ubuntu-appindicat...@ubuntu.com', 'dash-to-d...@micxgx.gmail.com', 
'temperature@xtranophilist', 'freon@UshakovVasilii_Github.yahoo.com']"
   b'org.gnome.shell' b'had-bluetooth-devices-setup' b'true'
   b'org.gnome.shell' b'app-picker-view' b'uint32 1'
   b'org.gnome.shell' b'favorite-apps' redacted by apport
   b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
  InstallationDate: Installed on 2018-01-20 (81 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180120)
  ProcCmdline: /usr/bin/gnome-shell
   Segfault happened at: 0x7f0772664c24 <meta_window_get_monitor+4>:    mov    
   PC (0x7f0772664c24) 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
   meta_window_get_monitor () from /usr/lib/x86_64-linux-gnu/libmutter-2.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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