Today my nameserver decided to stop working: /var/log was flooded with:

named[14514]: sysquery: no addrs found for root NS (G.ROOT-SERVERS.NET)

I run a local bind process acting as caching server and to provide some internal zones, neither local nor remote addresses could be resolved.

I found an entry in the Debian BTS (here) which worked for me:

• add forward only; to options
• add server xxx.xxx.xxx.xxx { edns no; }; for each forwarder