[Bug 1086775] Re: bind9 uses high CPU after lucid->precise upgrade

Wed Dec 5 13:46:14 UTC 2012

** Description changed:

  Summary: bind9 uses very high CPU after an upgrade from Lucid to
  Precise. I have traced this to a directory permissions problem as
  /var/cache/bind is not writeable by the bind group after an upgrade, but
  is writeable after a clean install.

  Ubuntu release:
  root at dev1-kvm-cluster:~# lsb_release -rd
  Description:	Ubuntu 12.04.1 LTS
  Release:	12.04

  Package version:
  root at dev1-kvm-cluster:~# apt-cache policy bind9
  bind9:
-   Installed: 1:9.8.1.dfsg.P1-4ubuntu0.4
-   Candidate: 1:9.8.1.dfsg.P1-4ubuntu0.4
-   Version table:
-  *** 1:9.8.1.dfsg.P1-4ubuntu0.4 0
-         500 http://gb.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
-         500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
-         100 /var/lib/dpkg/status
-      1:9.8.1.dfsg.P1-4 0
-         500 http://gb.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
+   Installed: 1:9.8.1.dfsg.P1-4ubuntu0.4
+   Candidate: 1:9.8.1.dfsg.P1-4ubuntu0.4
+   Version table:
+  *** 1:9.8.1.dfsg.P1-4ubuntu0.4 0
+         500 http://gb.archive.ubuntu.com/ubuntu/ precise-updates/main amd64 Packages
+         500 http://security.ubuntu.com/ubuntu/ precise-security/main amd64 Packages
+         100 /var/lib/dpkg/status
+      1:9.8.1.dfsg.P1-4 0
+         500 http://gb.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages

  Expected behaviour: Upgrading Lucid->Precise when bind9 is installed
  does not use >100% CPU

  Observed behaviour: Upgrading Lucid->Precise when bind9 is installed
- does not use >100% CPU
+ uses >100% CPU

  Root cause:

  On an upgraded machine:

  root at dev1-kvm-cluster:~# ls -la /var/cache/bind
  total 8
  drwxr-xr-x  2 root bind 4096 Jun  5  2012 .
  drwxr-xr-x 14 root root 4096 Dec  5 10:18 ..

  On a clean install of Precise:

  amb at adamant:~$ ls -la /var/cache/bind
  total 16
  drwxrwxr-x 2 root bind 4096 Dec  4 21:00 .
  drwxr-xr-x 8 root root 4096 Dec  3 20:54 ..
  -rw-r--r-- 1 bind bind  698 Dec  4 21:00 managed-keys.bind
  -rw-r--r-- 1 bind bind  512 Dec  4 21:00 managed-keys.bind.jnl

  Workaround:

  # chmod 775 /var/cache/bind
  # service bind9 restart

  Logs from the upgraded machine (see 'working directory not writeable'
  and 'permission denied')

  05-Dec-2012 12:23:35.719 found 2 CPUs, using 2 worker threads
  05-Dec-2012 12:23:35.720 using up to 4096 sockets
  05-Dec-2012 12:23:35.726 loading configuration from '/etc/bind/named.conf'
  05-Dec-2012 12:23:35.727 reading built-in trusted keys from file '/etc/bind/bind.keys'
  05-Dec-2012 12:23:35.727 using default UDP/IPv4 port range: [1024, 65535]
  05-Dec-2012 12:23:35.728 using default UDP/IPv6 port range: [1024, 65535]
  05-Dec-2012 12:23:35.729 listening on IPv6 interfaces, port 53
  05-Dec-2012 12:23:35.731 listening on IPv4 interface lo, 127.0.0.1#53
  05-Dec-2012 12:23:35.732 listening on IPv4 interface eth0, 10.40.0.5#53
  05-Dec-2012 12:23:35.734 listening on IPv4 interface eth1, 10.157.128.1#53
  05-Dec-2012 12:23:35.735 listening on IPv4 interface eth1, 10.161.208.1#53
  05-Dec-2012 12:23:35.736 listening on IPv4 interface eth0.60, 10.157.16.12#53
  05-Dec-2012 12:23:35.738 generating session key for dynamic DNS
  05-Dec-2012 12:23:35.738 sizing zone task pool based on 7 zones
  05-Dec-2012 12:23:35.744 using built-in root key for view _default
  05-Dec-2012 12:23:35.744 set up managed keys zone for view _default, file 'managed-keys.bind'
  05-Dec-2012 12:23:35.744 Warning: 'empty-zones-enable/disable-empty-zone' not set: disabling RFC 1918 empty zones
  05-Dec-2012 12:23:35.744 automatic empty zone: 254.169.IN-ADDR.ARPA
  05-Dec-2012 12:23:35.744 automatic empty zone: 2.0.192.IN-ADDR.ARPA
  05-Dec-2012 12:23:35.744 automatic empty zone: 100.51.198.IN-ADDR.ARPA
  05-Dec-2012 12:23:35.744 automatic empty zone: 113.0.203.IN-ADDR.ARPA
  05-Dec-2012 12:23:35.744 automatic empty zone: 255.255.255.255.IN-ADDR.ARPA
  05-Dec-2012 12:23:35.744 automatic empty zone: 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA
  05-Dec-2012 12:23:35.744 automatic empty zone: 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.IP6.ARPA
  05-Dec-2012 12:23:35.744 automatic empty zone: D.F.IP6.ARPA
  05-Dec-2012 12:23:35.744 automatic empty zone: 8.E.F.IP6.ARPA
  05-Dec-2012 12:23:35.744 automatic empty zone: 9.E.F.IP6.ARPA
  05-Dec-2012 12:23:35.744 automatic empty zone: A.E.F.IP6.ARPA
  05-Dec-2012 12:23:35.744 automatic empty zone: B.E.F.IP6.ARPA
  05-Dec-2012 12:23:35.744 automatic empty zone: 8.B.D.0.1.0.0.2.IP6.ARPA
  05-Dec-2012 12:23:35.749 command channel listening on 127.0.0.1#953
  05-Dec-2012 12:23:35.749 command channel listening on ::1#953
  05-Dec-2012 12:23:35.749 the working directory is not writable
  05-Dec-2012 12:23:35.749 ignoring config file logging statement due to -g option
  05-Dec-2012 12:23:35.750 zone 0.in-addr.arpa/IN: loaded serial 1
  05-Dec-2012 12:23:35.750 zone 157.10.in-addr.arpa/IN: loaded serial 1
  05-Dec-2012 12:23:35.751 zone 127.in-addr.arpa/IN: loaded serial 1
  05-Dec-2012 12:23:35.752 zone 255.in-addr.arpa/IN: loaded serial 1
  05-Dec-2012 12:23:35.753 zone extility.install/IN: loaded serial 1300877104
  05-Dec-2012 12:23:35.754 zone localhost/IN: loaded serial 2
  05-Dec-2012 12:23:35.754 managed-keys-zone ./IN: loading from master file managed-keys.bind failed: file not found
  05-Dec-2012 12:23:35.754 managed-keys.bind.jnl: create: permission denied
  05-Dec-2012 12:23:35.754 managed-keys-zone ./IN: sync_keyzone:dns_journal_open -> unexpected error

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Title:
  bind9 uses high CPU after lucid->precise upgrade

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