ad_attach panic 6.0-RELEASE AMD64

[Anish Mistry]

I'm getting the following panic after I install 6.0-RELEASE.  This 
doesn't occur if I install 5.4-STABLE-SNAP009.
Fatal trap 18: integer divide fault while in kernel mode
instruction pointer     = 0x8:0xffffffff801a447f
stack pointer           = 0x10:0xffffffff80674ae0
frame pointer           = 0x10:0xffffffff80674be0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 0 (swapper)
[thread pid 0 tid 0 ]
Stopped at      ad_attach+0x3ef:        divq    %rsi,%eax
db> bt
Tracing pid 0 tid 0 td 0xffffffff805845e0
ad_attach() at ad_attach+0x3ef
device_attach() at device_attach+0x292
bus_generic_attach() at bus_generic_attach+0x18
ata_identify() at ata_identify+0xe6
ata_boot_attach() at ata_boot_attach+0x50
run_interrupt_driven_config_hooks() at 
run_interrupt_driven_config_hooks+0x2a
mi_startup() at mi_startup+0xc9
btext() at btext+0x2c

http://am-productions.biz/docs/kev-amd64-pciconf.txt.gz
http://am-productions.biz/docs/kev-acpidump.txt.gz
http://am-productions.biz/docs/kev-dmesg.txt.gz

Let me know what other information I need to provide.

-- 
Anish Mistry
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