Seems to be a bug in avahi, see the comment in:
http://us.generation-nt.com/bug-614785-avahi-daemon-uses-100-cpu-when-scanned-nmap-dos-possible-help-202268272.html
which claims that the GIT code fixes the bug, available at:
http://git.0pointer.de/?p=avahi.git;a=commit;h=46109dfec75534fe270c0ab902576f685d5ab3a6
Seems to be a bug in avahi, see the comment in:
http:// us.generation- nt.com/ bug-614785- avahi-daemon- uses-100- cpu-when- scanned- nmap-dos- possible- help-202268272. html
which claims that the GIT code fixes the bug, available at:
http:// git.0pointer. de/?p=avahi. git;a=commit; h=46109dfec7553 4fe270c0ab90257 6f685d5ab3a6