From owner-freebsd-current@FreeBSD.ORG  Wed Oct 13 10:44:31 2004
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Date: Wed, 13 Oct 2004 12:44:30 +0200
From: Willem Jan Withagen <wjw@withagen.nl>
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Subject: Fatal trap when starting 2nd processor
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Hi,

It's been al long time since, but as of this motning I get:

ad0: 238475MB <WDC WD2500JB-00EVA0/15.05R15> [484521/16/63] at 
ata0-master UDMA100
SMP: AP CPU #1 Launched!
kernel trap 12 with interrupts disabled


Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address   = 0x0
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xffffffff80294a8a
stack pointer           = 0x10:0xffffffffb1b3db30
frame pointer           = 0x10:0x0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = resume, IOPL = 0
current process         = 29 (irq17: fwohci0+)

And that is on a Dual procesor Opteron system (with a Tyan board).
FreeBSD 5.3-BETA7 #142: Wed Oct 13 11:09:39 CEST 2004
    root@opteron.digiware.nl:/usr/obj/home1/src/sys/OPTERON.amd64

I'll try and compile the kernel without firewire to see if that changes 
things.

--WjW