Rescue/maintenance/failsafe, whatever the menu item is named this year. Have just run zypper dup and got kernel 6.1.7 with the same outcome. 6.0.12 still boots as expected. I can't easily see log entries pertaining to the failed boots. journalctl only seems to have log entries for the current boot stored. /var/log/messages logs the shutdown before the restart but nothing else until the known good boot following the failed boot.