From: SteveC <steve@fractalus.com>

I looked for a while through the mailing list archive and couldn't find anything
like this so please don't flame me :-)

It appears possible to ask the validator to check itself, then check itself
checking itself, then check itself checking itself checking itself and so on
recursively.

I tried the first 6 levels of recursion and got a roughly linearly increasing
delay of about and extra second per recursion level. This makes it interesting
as a DoS attack as you could cause multiple amounts of load on the machine for
trivial increase in network traffic.

I don't know if it is actually calling itself, but the increasing load time
would seem to suggest it.