Jeff Garzik wrote:

I rebooted my RHEL4-based ipv4/ipv6 gateway/server into 2.6.15-rc1, and 
very soon the box was brought to its knees, spewing

    VFS: file-max limit 400490 reached

Follow-up:  I may have excised too much from the head of the log I posted.

It now looks like the radvd troubles may have started with a link 
up/down event.

Attached is some additional lines found at the -head- of the previously 
posted log.