very weird booting issues with new machines - 4-core Opteron 270

This time I got a tiny bit more information from the MP
kernel crash:

root file system type: ffs
cpu1: CPU 1 running
cpu2: CPU 2 running
cpu3: CPU 3 running
kernelkernel:                                kernel:  
otection       trap,
protection                      netbsd:cpu_switch+0xc9: nop
db> kernel:  rotect     ault tr    c       Faultection
      trap     e=0
F   in  in                            con;inuing..   
b>ti    g..   db>

Hitting CR at this point goes to the BIOS reset.