Strange amd64 double panic

[John Klos <john%ziaspace.com@localhost>]

Hi,

Could anyone give me a clue about what might've caused this panic, and why 
it faulted while trying to do a traceback?

http://www.ziaspace.com/~john/amd64_panic.jpg

It's a quad core AMD system with 8 gigs of memory running netbsd-5 from 
14-May-2009.

Thanks,
John Klos