Hello Gert, 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+git20190124-0ubuntu18.04.2
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 for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

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

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/1790525

Title:
  gnome-shell assert failure: double free or corruption (fasttop) in
  g_free() from g_error_free() from cogl_error_free() from
  cogl_texture_new_with_size() from
  clutter_offscreen_effect_real_create_texture()

Status in mutter package in Ubuntu:
  Fix Released
Status in mutter source package in Bionic:
  Fix Committed
Status in mutter source package in Cosmic:
  Fix Released

Bug description:
  [ Impact ]

  Gnome shell crashes on double free

  Problem is occurring if dual monitor is used. Second monitor is
  repeatingly blank and activated again. At the bottom it probably
  contains the upper part of the first monitor. I had the same problem
  at 18.04 when using gdm3 without wayland during logon.

  [ Test case ]

  - Run gnome-shell with multimonitor
  - No flashing should happen on gdm initialization

  Also we should monitor crashes in e.u.c

  [ Regression potential ]

  Low, the proposed fix is part of the current stable branch upstream
  and not changed in further revisions.

  --

  ProblemType: CrashDistroRelease: Ubuntu 18.10
  Package: gnome-shell 3.29.90-2ubuntu1
  ProcVersionSignature: Ubuntu 4.17.0-9.10-generic 4.17.17
  Uname: Linux 4.17.0-9-generic i686
  ApportVersion: 2.20.10-0ubuntu9
  Architecture: i386
  AssertionMessage: double free or corruption (fasttop)
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Sep  3 21:02:58 2018
  DisplayManager: gdm3
  ExecutablePath: /usr/bin/gnome-shell
  GsettingsChanges: b'org.gnome.desktop.interface' b'gtk-im-module' 
b"'gtk-im-context-simple'"
  ProcCmdline: /usr/bin/gnome-shell
  ProcEnviron:
   LANGUAGE=en_US:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  Signal: 6SourcePackage: gnome-shell
  StacktraceTop:
   __libc_signal_restore_set (set=0xbfcd5e9c) at 
../sysdeps/unix/sysv/linux/nptl-signals.h:80
   __GI_raise (sig=6) at ../sysdeps/unix/sysv/linux/raise.c:48
   __GI_abort () at abort.c:79
   __libc_message (action=do_abort, fmt=<optimized out>) at 
../sysdeps/posix/libc_fatal.c:181
   malloc_printerr (str=str@entry=0xb6b437e8 "double free or corruption 
(fasttop)") at malloc.c:5350
  Title: gnome-shell assert failure: double free or corruption (fasttop)
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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