Panic on 6.1-STABLE (fatal trap 19: non-maskable interrupt)

[Hugo Silva]

Hi all,

I've experienced a panic on a database server running 6.1-STABLE (Jul 
3). Altough I don't have a dump, my co-worked managed to take a 
screenshot of the console thru DRAC. The text is all messed up as you'll 
notice. I had never seen this behaviour (nor a trap 19, to be honest). 
This server was up for around 12 days without any trouble. It's a 
heavily loaded database server.

Without any other clue (dumps, etc), what would you bet on as being the 
cause for the panic AND the corrupted text (see attached screenshot) ?