Problem reproduced with old version: gert@gert-laptop:~$ dpkg -s libmutter-2-0 | grep Version Version: 3.28.3-2~ubuntu18.04.2
Apr 19 14:41:11 gert-laptop gnome-shell[991]: CoglError set over the top of a previous CoglError or uninitialized memory. This indicates a bug in someone's code. You must ensure an error is NULL before it's set. The overwriting error message was: Sliced texture size of 2560 x 1024 not possible with max waste set to -1 Apr 19 14:41:11 gert-laptop org.gnome.Shell.desktop[991]: double free or corruption (fasttop) Apr 19 14:41:11 gert-laptop org.gnome.Shell.desktop[991]: == Stack trace for context 0x1ab5838 == Apr 19 14:41:47 gert-laptop org.gnome.Shell.desktop[991]: (EE) Apr 19 14:41:47 gert-laptop org.gnome.Shell.desktop[991]: Fatal server error: Apr 19 14:41:47 gert-laptop org.gnome.Shell.desktop[991]: (EE) failed to read Wayland events: Broken pipe Apr 19 14:41:47 gert-laptop org.gnome.Shell.desktop[991]: (EE) Apr 19 14:41:47 gert-laptop gnome-session-binary[983]: WARNING: Application 'org.gnome.Shell.desktop' killed by signal 6 After installation from proposed, the problem was solved: root@gert-laptop:/etc/apt# dpkg -s libmutter-2-0 | grep Version Version: 3.28.3+git20190124-0ubuntu18.04.2 -- 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1790525/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp