Public bug reported:

Avahi has a bug that can cause it to run into a 100% CPU-using loop

It has been fixed by the following changesets

http://www.avahi.org/changeset/1340
http://www.avahi.org/changeset/1341
http://www.avahi.org/changeset/1342

R1340 fixes the problem, R1341 is a slight cosmetic fix (uses a #define
rather than the raw value), would prefer to include this so it matches
upstream

R1342 adds some extra checks that haven't been proven to cause a problem
but are good, you may not apply this bu certainly at a minimum R1340 is
required to fix this bug.

** Affects: avahi (upstream)
     Importance: Unknown
         Status: Unknown
** Affects: avahi (Ubuntu)
     Importance: High
         Status: Confirmed

** Changed in: avahi (Ubuntu)
   Importance: Undecided => High
       Status: Unconfirmed => Confirmed

** Bug watch added: Avahi #84
   http://www.avahi.org/ticket/84

** Also affects: avahi (upstream) via
   http://www.avahi.org/ticket/84
   Importance: Unknown
       Status: Unknown

-- 
Avahi can run into an infinite loop on reception of a bad packet
https://launchpad.net/bugs/76012

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