Fatal trap 12 during bootup on Dell Cpt with acpi enabled

[Alex Hornung]

: I was experimenting with the latest Dragonfly build on a spare Dell Cpt
: laptop. If you boot with acpi enabled, you get a kernel fault right
: after it outputs "ata0: <ATA channel 0> on atapci0"

Could you please start up without acpi loaded, and then try loading acpi
later with kldload and see if that panics, too?
If so, try and get a dump by writing 'call dumpsys' at the ddb> prompt. Once
you have the dump, when you reboot again (without acpi loaded, so it doesn't
panic), the dump will be written to /var/crash.

If you can then upload that dump somewhere, someone might be able to figure
out what the problem is.

Cheers,
Alex Hornung