Repeatable breakage in RELENG_6

Hi

I have a boot panic (page fault in kernel) which is identical
on my very old gateway box (i586 166MHz) and a much newer buildbox.

The sources are unadulterated RELENG_6, and the panic happens at boot
time when probing the ata disks.

Here is a manually copied backtrace:

devclass_get_maxunit()
ata_boot_attach()
run_interrupt_driven_config_hooks()
mi_startup()
begin()

The kernel is a stripped down GENERIC, with the ata devices loaded as
modules.

M
-- 
Mark R V Murray - Cert APS(Open) Dip Phys(Open) BSc Open(Open)
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