We had the need to restore an old 1.27.3 backup and after somewhat successful restoring the database and the images from a backup we get the following error when trying to log in:
a9b4f70a8d238d6da0f81c6c] /index.php/Special:UserLogin MWException from line 3809 of /var/www/mediawiki/code/includes/user/User.php: CAS update failed on user_touched for user ID '2' (read from slave); the version of the user to be saved is older than the current version. Backtrace: #0 /var/www/mediawiki/code/includes/session/SessionBackend.php(639): User->saveSettings()
Now there are dozens of entries in Phabricator when searching for CAS update failed on user_touched but i did not find an explanation what the reason for this behavior is and what sense to make of the error message. Where is the documentation for this?