It just happened again: uvm_fault panic on the new file server.

Again, I was un-tar-ing a rather large (7-8G) tar.

Again, I got a uvm_fault in dqget.

Again, I got no backtrace from DDB.

Again, I got a "locking against myself" panic during (after?) sync.

However, this time I had my dump device configured correctly so I do  
have a core.

It's still 4.0 beta 2 on amd64.

Could someone please help me investigate this?
Kernel panics on a file server can really spoil your day.
Approx. 40 mins downtime (dump, savecore, fsck. quotacheck) are no  
fun either.

Thanks for any help.