*** 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()

** Information type changed from Private to Public

** Tags removed: need-amd64-retrace

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https://bugs.launchpad.net/bugs/1761149

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

Status in gnome-shell package in Ubuntu:
  New

Bug description:
  This crash happens always when I turn off and on the monitor.
  According to information it is a duplicate of bug #1724439, but when I'm 
asked to report the bug, this bug number or my earlier reported bug isn't among 
the suggested bugs.

  ProblemType: Crash
  DistroRelease: Ubuntu 18.04
  Package: gnome-shell 3.28.0-0ubuntu2
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu2
  Architecture: amd64
  CrashCounter: 1
  CurrentDesktop: ubuntu-communitheme:ubuntu:GNOME
  Date: Wed Apr  4 13:37:33 2018
  DisplayManager: gdm3
  ExecutablePath: /usr/bin/gnome-shell
  InstallationDate: Installed on 2018-04-01 (2 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180330)
  ProcCmdline: /usr/bin/gnome-shell
  SegvAnalysis:
   Segfault happened at: 0x7f68c98ebc24 <meta_window_get_monitor+4>:    mov    
0x18(%rax),%eax
   PC (0x7f68c98ebc24) 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-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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