>ve that the panic occurs anywhere in the ACPI
> code. From
> what I can tell, the transition to ACPI mode causes the idle thread on
> the other processor to panic.
>
> I believe that I have identified the line of code that triggers the
> panic. It is the actual transition to ACPI mode at
> drivers/acpi/hardware/hwacpi.c, line 143. If I insert an
> infinite loop
> before the call to acpi_os_write_port, the boot process simply hangs.
> If I move the loop below the call to acpi_os_write_port, I
> get the same
> old panic message.
>
That experiment can only tell that there is no panic displayed on you
screen
before the infinite loop.
I did remember this error, but I cannot find out other emails about this
issue.
Did you file it on bugzilla.kernel.org? It will help us a lot.
Thanks,
Luming