Hello Rachel, or anyone else affected,

Accepted mutter into bionic-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/mutter/3.28.3-2~ubuntu18.04.1 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-bionic to verification-done-bionic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-bionic. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: mutter (Ubuntu Bionic)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-bionic

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https://bugs.launchpad.net/bugs/1723615

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

Status in gnome-shell package in Ubuntu:
  Fix Released
Status in mutter package in Ubuntu:
  Fix Released
Status in mutter source package in Bionic:
  Fix Committed

Bug description:
  https://gitlab.gnome.org/GNOME/mutter/issues/130
  https://errors.ubuntu.com/problem/84e05b052e88b79520a684d6113084e9be8bc339

  ---

  [ Description ]

  This happened while I was away from the computer. By the timing it
  should have been well after the time it should have gone *into*
  displaysleep, and was also about 45min before I returned, so certainly
  wasn't the wake-up process either.

  What I observed when I did return: My 4K monitor didn't wake up
  (that's a known problem with this monitor, Dell P2715Q), the second
  monitor (Dell U2711) did wake up, showing the login screen.

  So although I've considered my Dell 4K problem a problem with waking
  up, I wonder if it might be actually a problem with it apparently
  going away completely after a longer displaysleep (it's usually fine
  if I just do a short sleep of a minute or two).

  Another possibility is the cat stepped on the keyboard and thus
  triggered an attempted display-wake. But that would actually be out of
  character (for the cat).

  Either way is a bug because the session should survive monitor
  shenanigans... :-)

  In some not known conditions, g-s might crash while computing global
  resolution for monitors.

  [ Test case ]

  There's really no test case for this bug, a part that g-s should not
  crash with this stacktrace. Unforuntaltey this is quite hard to
  reproduce, it might happen while resetting the crtc when setting up a
  (new) monitor or at wake up, but so far nobody has reported a way for
  reproducing this.

  [ Regression potential ]

  Global scale for attached monitors could not be properly computed, and
  thus if attaching an HiDPI device, the UI could not be scaled properly

  ---

  ProblemType: CrashDistroRelease: Ubuntu 17.10
  Package: gnome-shell 3.26.1-0ubuntu3
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.7-0ubuntu3
  Architecture: amd64
  CurrentDesktop: GNOME-Greeter:GNOME
  Date: Sat Oct 14 15:39:50 2017
  DisplayManager: gdm3
  ExecutablePath: /usr/bin/gnome-shell
  GsettingsChanges:

  InstallationDate: Installed on 2017-07-30 (75 days ago)
  InstallationMedia: Ubuntu-GNOME 17.04 "Zesty Zapus" - Release amd64 (20170412)
  ProcCmdline: /usr/bin/gnome-shell
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/false
  SegvAnalysis:
   Segfault happened at: 0x7fae20ab44a0 <meta_monitor_mode_get_resolution>:     
mov    0x8(%rdi),%eax
   PC (0x7fae20ab44a0) ok
   source "0x8(%rdi)" (0x00000008) not located in a known VMA region (needed 
readable region)!
   destination "%eax" ok
  SegvReason: reading NULL VMA
  Signal: 11SourcePackage: gnome-shell
  StacktraceTop:
   meta_monitor_mode_get_resolution () at 
/usr/lib/x86_64-linux-gnu/libmutter-1.so.0
   meta_monitor_calculate_mode_scale () at 
/usr/lib/x86_64-linux-gnu/libmutter-1.so.0
   meta_monitor_manager_update_logical_state_derived () at 
/usr/lib/x86_64-linux-gnu/libmutter-1.so.0
   meta_monitor_manager_rebuild_derived () at 
/usr/lib/x86_64-linux-gnu/libmutter-1.so.0
   meta_monitor_manager_xrandr_handle_xevent () at 
/usr/lib/x86_64-linux-gnu/libmutter-1.so.0
  Title: gnome-shell crashed with SIGSEGV in meta_monitor_mode_get_resolution()
  UpgradeStatus: Upgraded to artful on 2017-08-22 (53 days ago)
  UserGroups:

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