AP #2 (PHY# 1) failed! (panic y/n?)

[Don Bowman]

has anyone seen this before with 4.7-RELEASE on an SMP
motherboard? It happened once on one boot, not seen
it before or since on the same system.
This is a 1U 2x 2.8GHz XEON system with 10 Intel 'em'
devices.

Programming 24 pins in IOAPIC #0
IOAPIC #0 intpin 2 -> irq 0
Programming 24 pins in IOAPIC #1
Programming 24 pins in IOAPIC #2
AP #2 (PHY# 1) failed!
panic y/n? [y] 
 ...
FreeBSD/SMP: Multiprocessor motherboard

I pressed 'n', and it continued normally (I think).