find: File system loop detected

named, that is the DNS server, runs in a chroot. To access the configuration file, the startup script uses mount --bind to make the configuration dir visible inside the chroot. This means that /var/named/ is the same as /var/named/chroot/var/named, and /var/named/chroot/var/named/chroot/var/named and so on. This is a recursive directory structure so if find tried to transverse it all it would never be able to terminate its execution, so it realizes that the two directory are actually the same, and prints you that message, to warn you.

The message means that find won't search inside /var/named/chroot/var/named because it realized it is the same as some other directory already seen before. It is a totally harmless message, you can safely ignore it: after skipping /var/named/chroot/var/named the find operation continues normally.