*** This bug is a duplicate of bug 1886059 ***
    https://bugs.launchpad.net/bugs/1886059

Thank you for taking the time to report this bug and helping to make
Ubuntu better. This particular bug has already been reported and is a
duplicate of bug 1886059, so it 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. Feel free to continue to report any other bugs you may
find.


** This bug has been marked a duplicate of bug 1886059
   gnome-shell crashed with assertion failure "!xcb_xlib_threads_sequence_lost" 
[xcb_io.c:260]

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https://bugs.launchpad.net/bugs/1924613

Title:
  gnome-shell assert failure: gnome-shell: ../../src/xcb_io.c:260:
  poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.

Status in gnome-shell package in Ubuntu:
  New

Bug description:
  Description:  Ubuntu 20.04.2 LTS
  Release:      20.04

  gnome-shell:
    Installed: 3.36.7-0ubuntu0.20.04.1
    Candidate: 3.36.7-0ubuntu0.20.04.1
    Version table:
   *** 3.36.7-0ubuntu0.20.04.1 500
          500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
          100 /var/lib/dpkg/status
       3.36.4-1ubuntu1~20.04.2 500
          500 http://archive.ubuntu.com/ubuntu focal-security/main amd64 
Packages
       3.36.1-5ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

  mutter 3.36.7

  Description of issue: The GUI seems to freeze/reload/refresh instantly. It 
happens when I e.g. click on the docker panel and/or just move the mouse cursor 
around, click on apps and do something GUI related, open folders. The GUI 
reload/refresh crash lasts for about 2 seconds, it suddenly/instantly 
repositions my mouse cursor to the lower right corner of the screen and my 
laptop's fan works harder at those 2 seconds. The issue started after I updated 
and, at a later time, rebooted the machine.
  Below are the gnome-related upgrades that I did (`cat /var/log/dpkg.log | 
grep gnome`):

  2021-04-15 17:50:29 status triggers-pending gnome-menus:amd64 3.36.0-1ubuntu1
  2021-04-15 17:50:30 upgrade libreoffice-gnome:amd64 1:6.4.6-0ubuntu0.20.04.1 
1:6.4.7-0ubuntu0.20.04.1
  2021-04-15 17:50:30 status half-configured libreoffice-gnome:amd64 
1:6.4.6-0ubuntu0.20.04.1
  2021-04-15 17:50:30 status unpacked libreoffice-gnome:amd64 
1:6.4.6-0ubuntu0.20.04.1
  2021-04-15 17:50:30 status half-installed libreoffice-gnome:amd64 
1:6.4.6-0ubuntu0.20.04.1
  2021-04-15 17:50:30 status unpacked libreoffice-gnome:amd64 
1:6.4.7-0ubuntu0.20.04.1
  2021-04-15 17:50:56 configure libreoffice-gnome:amd64 
1:6.4.7-0ubuntu0.20.04.1 <none>
  2021-04-15 17:50:56 status unpacked libreoffice-gnome:amd64 
1:6.4.7-0ubuntu0.20.04.1
  2021-04-15 17:50:56 status half-configured libreoffice-gnome:amd64 
1:6.4.7-0ubuntu0.20.04.1
  2021-04-15 17:50:56 status installed libreoffice-gnome:amd64 
1:6.4.7-0ubuntu0.20.04.1
  2021-04-15 17:50:57 trigproc gnome-menus:amd64 3.36.0-1ubuntu1 <none>
  2021-04-15 17:50:57 status half-configured gnome-menus:amd64 3.36.0-1ubuntu1
  2021-04-15 17:50:57 status installed gnome-menus:amd64 3.36.0-1ubuntu1
  2021-04-15 18:00:30 status triggers-pending gnome-menus:amd64 3.36.0-1ubuntu1
  2021-04-15 18:00:30 trigproc gnome-menus:amd64 3.36.0-1ubuntu1 <none>
  2021-04-15 18:00:30 status half-configured gnome-menus:amd64 3.36.0-1ubuntu1
  2021-04-15 18:00:30 status installed gnome-menus:amd64 3.36.0-1ubuntu1

  ProblemType: Crash
  DistroRelease: Ubuntu 20.04
  Package: gnome-shell 3.36.7-0ubuntu0.20.04.1
  ProcVersionSignature: Ubuntu 5.8.0-49.55~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-49-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  AssertionMessage: gnome-shell: ../../src/xcb_io.c:260: poll_for_event: 
Assertion `!xcb_xlib_threads_sequence_lost' failed.
  CasperMD5CheckResult: skip
  CrashCounter: 1
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Apr 15 22:04:15 2021
  DisplayManager: gdm3
  ExecutablePath: /usr/bin/gnome-shell
  ExecutableTimestamp: 1608008084
  InstallationDate: Installed on 2021-01-17 (88 days ago)
  InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  ProcCmdline: /usr/bin/gnome-shell
  ProcCwd: /home/freekostageo
  RelatedPackageVersions: mutter-common 3.36.7+git20201123-0.20.04.1
  Signal: 6
  SourcePackage: gnome-shell
  StacktraceTop:
   __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
   __GI_abort () at abort.c:79
   __assert_fail_base (fmt=0x7feadaaeb588 "%s%s%s:%u: %s%sAssertion `%s' 
failed.\n%n", assertion=0x7feada528858 "!xcb_xlib_threads_sequence_lost", 
file=0x7feada5286c3 "../../src/xcb_io.c", line=260, function=<optimized out>) 
at assert.c:92
   __GI___assert_fail (assertion=0x7feada528858 
"!xcb_xlib_threads_sequence_lost", file=0x7feada5286c3 "../../src/xcb_io.c", 
line=260, function=0x7feada528b10 "poll_for_event") at assert.c:101
   ?? () from /lib/x86_64-linux-gnu/libX11.so.6
  Title: gnome-shell assert failure: gnome-shell: ../../src/xcb_io.c:260: 
poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip docker lpadmin lxd plugdev sambashare sudo
  modified.conffile..etc.xdg.autostart.gnome-shell-overrides-migration.desktop: 
[modified]
  mtime.conffile..etc.xdg.autostart.gnome-shell-overrides-migration.desktop: 
2021-01-28T02:14:06.107431
  separator:

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