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I've not been able to reproduce this when upgrading from Lucid to Precise (1:9.7.0.dfsg.P1-1ubuntu0.8 to 1:9.8.1.dfsg.P1-4ubuntu0.4). /var/cache/bind had the correct (775) permissions. If I remove its contents and change the permissions to 755, then I do see the 100% CPU usage and the error in the log file that you've reported. But what I don't see is how to get the permissions to the erroneous 755 in the first place - simply installing bind9 in Lucid and upgrading to Precise doesn't seem to do it. Are you sure that the permissions weren't already wrong due to a local misconfiguration before you upgraded? Marking as Incomplete for now. If you manage to figure out how to reproduce this problem, please comment and change the bug status back to New. ** Changed in: bind9 (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bind9 in Ubuntu. https://bugs.launchpad.net/bugs/1086775 Title: bind9 uses high CPU after lucid->precise upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bind9/+bug/1086775/+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