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.