Thread:Project:Support desk/No login page after 1.21.3 to 1.22 upgrade - Uncommitted DB writes?/reply (11)

This may be related to problems with the new handling of the Job queue on page requests. Try setting $wgJobRunRate = 0; to see if problem disappears. You may need to set $wgPhpCli to false to revert to the old handling system that doesn't have this problem, until it's fixed.