Looks like something causes an avalanche of crashes, and then finally Gnome crashes and GMK3 is started:
-- The process' exit code is 'exited' and its exit status is 1.
Sep 08 22:48:28 thinkpad polkitd(authority=local)[901]: Unregistered Authentication Agent for unix-session:2 (system bus name :1.86, object path /org/freedesktop/Policy>
Sep 08 22:48:28 thinkpad systemd[1534]: org.gnome.SettingsDaemon.Power.service: Main process exited, code=exited, status=1/FAILURE
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- An ExecStart= process belonging to unit UNIT has exited.
--
-- The process' exit code is 'exited' and its exit status is 1.
Sep 08 22:48:28 thinkpad systemd[1534]: org.gnome.SettingsDaemon.Wacom.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has entered the 'failed' state with result 'exit-code'.
Sep 08 22:48:28 thinkpad systemd[1534]: gnome-terminal-server.service: Main process exited, code=exited, status=1/FAILURE
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- An ExecStart= process belonging to unit UNIT has exited.
--
-- The process' exit code is 'exited' and its exit status is 1.
Sep 08 22:48:28 thinkpad systemd[1534]: gnome-terminal-server.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has entered the 'failed' state with result 'exit-code'.
Sep 08 22:48:28 thinkpad systemd[1534]: org.gnome.SettingsDaemon.Keyboard.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has entered the 'failed' state with result 'exit-code'.
Sep 08 22:48:28 thinkpad systemd[1534]: org.gnome.SettingsDaemon.Color.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has entered the 'failed' state with result 'exit-code'.
Sep 08 22:48:28 thinkpad systemd[1534]: org.gnome.SettingsDaemon.MediaKeys.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has entered the 'failed' state with result 'exit-code'.
Sep 08 22:48:28 thinkpad systemd[1534]: org.gnome.SettingsDaemon.Power.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has entered the 'failed' state with result 'exit-code'.
Sep 08 22:48:28 thinkpad systemd[1534]: vte-spawn-73b3191c-7d5f-4436-a191-01c4c0877ab8.scope: Succeeded.
-- Subject: Unit succeeded
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has successfully entered the 'dead' state.
Sep 08 22:48:28 thinkpad systemd[1534]: gnome-launched-update-notifier.desktop-3446.scope: Succeeded.
-- Subject: Unit succeeded
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has successfully entered the 'dead' state.
Sep 08 22:48:28 thinkpad systemd[1534]: gnome-launched-org.gnome.Evolution-alarm-notify.desktop-1882.scope: Succeeded.
-- Subject: Unit succeeded
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has successfully entered the 'dead' state.
Sep 08 22:48:28 thinkpad gsd-xsettings[2038]: gsd-xsettings: Fatal IO error 11 (Resource temporarily unavailable) on X server :1.
Sep 08 22:48:28 thinkpad systemd[1534]: gnome-launched-gnome-software-service.desktop-2202.scope: Succeeded.
-- Subject: Unit succeeded
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has successfully entered the 'dead' state.
Sep 08 22:48:28 thinkpad systemd[1534]: org.gnome.SettingsDaemon.XSettings.service: Main process exited, code=exited, status=1/FAILURE
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- An ExecStart= process belonging to unit UNIT has exited.
--
-- The process' exit code is 'exited' and its exit status is 1.
Sep 08 22:48:28 thinkpad systemd[1534]: org.gnome.SettingsDaemon.XSettings.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has entered the 'failed' state with result 'exit-code'.
Sep 08 22:48:28 thinkpad systemd[1534]: org.gnome.Shell@wayland.service: Failed with result 'signal'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has entered the 'failed' state with result 'signal'.
Sep 08 22:48:28 thinkpad systemd[1534]: org.gnome.Shell@wayland.service: Triggering OnFailure= dependencies.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopping Application launched by gnome-session-binary.
-- Subject: A stop job for unit UNIT has begun execution
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has begun execution.
--
-- The job identifier is 1290.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopping Application launched by gnome-session-binary.
-- Subject: A stop job for unit UNIT has begun execution
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has begun execution.
--
-- The job identifier is 1297.
Sep 08 22:48:28 thinkpad systemd[1534]: gnome-launched-spice-vdagent.desktop-1843.scope: Succeeded.
-- Subject: Unit succeeded
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has successfully entered the 'dead' state.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped Application launched by gnome-session-binary.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1296 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopping Application launched by gnome-session-binary.
-- Subject: A stop job for unit UNIT has begun execution
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has begun execution.
--
-- The job identifier is 1294.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME Wayland Session (session: zorin).
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1242 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target Current graphical user session.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1286 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: unicast-local-avahi.path: Succeeded.
-- Subject: Unit succeeded
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has successfully entered the 'dead' state.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped Path trigger for Avahi .local domain notifications.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1293 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: update-notifier-crash.path: Succeeded.
-- Subject: Unit succeeded
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has successfully entered the 'dead' state.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped Path trigger for Apport crash notifications.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1292 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: update-notifier-release.path: Succeeded.
-- Subject: Unit succeeded
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has successfully entered the 'dead' state.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped Path trigger for new release of Ubuntu notifications.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1291 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME Session.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1282 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME Wayland Session.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1289 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME session X11 services.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1251 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME session X11 services.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1249 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME Session (session: zorin).
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1241 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME accessibility target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1253 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME color management target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1258 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME date & time target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1261 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME maintenance of expirable data target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1278 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME keyboard configuration target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1245 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME keyboard shortcuts target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1247 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME power management target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1263 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME printer notifications target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1265 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME RFKill support target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1276 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME FreeDesktop screensaver target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1269 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME file sharing target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1267 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME smartcard target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1274 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME sound sample caching target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1243 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME Wacom tablet support target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1255 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped target GNOME XSettings target.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1273 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopping GNOME accessibility service...
-- Subject: A stop job for unit UNIT has begun execution
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has begun execution.
--
-- The job identifier is 1254.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopped GNOME color management service.
-- Subject: A stop job for unit UNIT has finished
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has finished.
--
-- The job identifier is 1259 and the job result is done.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopping GNOME date & time service...
-- Subject: A stop job for unit UNIT has begun execution
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has begun execution.
--
-- The job identifier is 1262.
Sep 08 22:48:28 thinkpad systemd[1534]: Stopping GNOME maintenance of expirable data service...
-- Subject: A stop job for unit UNIT has begun execution
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A stop job for unit UNIT has begun execution.
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- An ExecStart= process belonging to unit UNIT has exited.
--
-- The process' exit code is 'killed' and its exit status is 11.
Sep 08 22:48:28 thinkpad systemd[1534]: org.gnome.SettingsDaemon.MediaKeys.service: Main process exited, code=exited, status=1/FAILURE
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- An ExecStart= process belonging to unit UNIT has exited.
--
-- The process' exit code is 'exited' and its exit status is 1.
Sep 08 22:48:28 thinkpad polkitd(authority=local)[901]: Unregistered Authentication Agent for unix-session:2 (system bus name :1.86, object path /org/freedesktop/Policy>
Sep 08 22:48:28 thinkpad systemd[1534]: org.gnome.SettingsDaemon.Power.service: Main process exited, code=exited, status=1/FAILURE
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- An ExecStart= process belonging to unit UNIT has exited.
--
-- The process' exit code is 'exited' and its exit status is 1.
Sep 08 22:48:28 thinkpad systemd[1534]: org.gnome.SettingsDaemon.Wacom.service: Failed with result 'exit-code'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit UNIT has entered the 'failed' state with result 'exit-code'.
Sep 08 22:48:28 thinkpad systemd[1534]: gnome-terminal-server.service: Main process exited, code=exited, status=1/FAILURE
-- Subject: Unit process exited
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- An ExecStart= process belonging to unit UNIT has exited.
--
-- The process' exit code is 'exited' and its exit status is 1.
Sep 08 22:48:28 thinkpad systemd[1534]: gnome-terminal-server.service: Failed with result 'exit-code'.
-- Subject: Unit failed
And yes, there is way more of this in the log, this is but a snippet.
Is it to do with putting the display to sleep? In any event I can't decipher what cause this crash avalanche in systemd
(?) Also the unit UNIT is mentioned, what is that?