[Pkg-utopia-maintainers] Bug#898038: caused by host

[Trent Lloyd]

I have been tracking this issue in Ubuntu at: 
https://bugs.launchpad.net/bugs/1752411

The root cause of this issue is a bug in 'host', in certain 
circumstances the host command hangs and never returns. I can reproduce 
this reliably.
The main case I have found is when an interface is up, but the link is 
still down and a default route is installed in the state 'linkdown'.  
This only happens if that is the route used to send packets to a 
nameserver listed in resolv.conf

I haven't yet managed to debug what causes host to fail internally and 
never timeout in this case, but a workaround is to modify 
avahi-daemon-check-dns.sh to launch host under the 'timeout' command 
with a 5 second timeout to ensure it doesn't block forever.

The real issue in host needs to be fixed, though, I have a machine that 
reproduces this issue reliably if anyone is experience in bind9-host 
debugging and I can reproduce it on demand.

- Trent