Random kernel blocking loop message (btx halted)

[David Demelier]

Hi folks,

Sometimes (really rare), when I boot these messages appears in a 
infinite loop :

http://markand.malikania.fr/Photo0393.jpg

These messages are printed so fast that I can't read it, happily Scroll 
lock key let me take a picture.

When this appears I have no solution instead rebooting with ctrl + alt + 
delete.

My machine is running on a Intel DH55HC with FreeBSD 8.2-RELEASE amd64.

Cheers,

-- 
David Demelier