Hi,

I encountered this on the FreeBSD list:

http://lists.freebsd.org/pipermail/cvs-src/2005-August/051127.html

It's from august 18th, the message was:

"Update the vendor branch with a patch to this file that was
  researched by glebius, and incorporated by ISC into the next
  version of BIND. Unfortunately, it looks like their release
  will come after the release of FreeBSD 6, so we will bring
  this in now.
  
  The patch addresses a problem with high-load resolvers which
  hit memory barriers. Without this patch, running the resolving
  name server out of memory would lead to "unpredictable results."
  
  Of course, the canonical answer to this problem is to put more
  memory into the system, however that is not always possible, and
  the code should be able to handle this situation gracefully in
  any case."

Unfortunatly, i cannot see the patch from isc, but it might be an idea to 
merge it into 9.3.0 until the release of 9.4.0?
Bye,

Mipam.