FreeBSD Security Advisory – When named(8) receives a specially crafted dynamic update message an internal assertion check is triggered which causes named(8) to exit. To trigger the problem, the dynamic update message must contains a record of type “ANY” and at least one resource record set (RRset) for this fully qualified domain name (FQDN) must exist on the server.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/81790/FreeBSD-SA-09-13.pipe.txt
Source: https://packetstormsecurity.com/files/81790/FreeBSD-Security-Advisory-kqueue-pipe.html