My workaround is to restore the php5 cron job from 11.04, which does not call fuser:
This is the 11.10 cron job: 09,39 * * * * root [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir fuser -s {} 2>/dev/null \; -delete And this is the 11.04 cron job: 09,39 * * * * root [ -x /usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) -delete We think fuser was added to cater for some edge case of process not closing the session file, but was never tested with a large number of sessions. I posted this solution yesterday on the thread: http://ubuntuforums.org/showthread.php?p=11355965 ** Also affects: psmisc (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to php5 in Ubuntu. https://bugs.launchpad.net/bugs/876387 Title: fuser forking uncontrollably in cron job To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/php5/+bug/876387/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs