Ubuntu
bind9 package

  1. Bug #1086775
  2. Comment #8

Comment 8 for bug 1086775

Revision history for this message
Robie Basak (racb) wrote : Re: bind9 uses high CPU after lucid->precise upgrade

Thanks for your insight Alex. I've managed to reproduce this now, with the following steps:

On Lucid:
 1. sudo apt-get install bind9
 2. sudo apt-get remove bind9
 # this removes /var/cache/bind but leaves /etc/bind9/rndc.key
 3. sudo apt-get install bind9
 # Now the postinst doesn't fix /var/cache/bind, but on Lucid nobody will notice this problem
 4. sudo do-release-upgrade
 # bind now uses /var/cache/bind/managed-keys.bind and the problem occurs

After the upgrade to Precise, bind9 is in the situation you described (permissions on /var/cache/bind wrong), with 100% CPU consumption.

I couldn't reproduce the problem directly on Precise because on package removal /var/cache/bind/managed-keys.bind is left behind and so /var/cache/bind never gets removed (I think this is a separate bug in itself).

It seems likely to me that this issue will affect Debian also, so next I will test this and file a bug report in Debian as needed, so that we can coordinate a fix.