Hi,
I tried a 4.99.1 kernel built from today's sources. It panics with a
call to mpbios_int()

[sniped]

mpbios: bus 0 is type PCI
mpbios: bus 1 is type PCI
mpbios: bus 2 is type PCI
mpbios: bus 3 is type PCI
mpbios: bus 4 is type PCI
mpbios: bus 5 is type PCI
mpbios: bus 6 is type PCI
mpbios: bus 7 is type ISA
ioapic0 at mainbus0 apid 2 (I/O APIC)
ioapic0: pa 0xfec00000, version 3, 24 pins
ioapic1 at mainbus0 apid 3 (I/O APIC)
ioapic1: pa 0xfecc0000, version 3, 24 pins
mpbios: WARNING: pin 27 for apic 3 too high; assuming ACPI global int value
kernel: protection fault trap, code=0
Stopped in pid 0.1 (swapper) at netbsd:mpbios_int+0x2a8:
cmpl    0x28(%rdx), %r15d
db> bt
mpbios_int() at netbsd:mpbios_int+0x2a8
?() at 0
db>

rdx holds 0xdeadbeefdeadbeef
r15 hold 0

Anything else I can do to help debug? This panic happens every boot,
so it's highly reproducable ;)

-- 
Matt

http://mattssanctuary.blogspot.com