Fatal trap 12 during bootup on Dell Cpt with acpi enabled

[LordYoukai]

Disabling cpu_cst seems to have alleviated the panic issue. There is 
still the issue of a long wait at bootup after the discovery of kbd0 but 
it did boot.

On 3/11/2010 9:13 PM, YONETANI Tomokazu wrote:
On Tue, Mar 09, 2010 at 03:50:34PM -0800, LordYoukai wrote:
current process = Idle
current thread = pri 12
kernel: type 12 trap, code = 2
Stopped at AcpiReadBitRegister+0x46:   movl %eax,0(%edx)
Since the current process is Idle and it's crashing somewhere in
AcpiReadBitRegister(), I guess that the caller is probably acpi_cpu_idle().
You can turn off part of ACPI subdrivers by setting boot loader variable
(you can find the names of other subdrivers in acpi(4)):
   set debug.acpi.disabled="cpu_cst"
and see if it still panics.

Alternatively, if you can modify the acpi code and reinstall the driver,
the following procedure may or may not fix the issue.
$ cd /sys/dev/acpica5
(if you don't have write access on /usr/obj, you need to set
  an environment variable MAKEOBJDIRPREFIX to somewhere else
  where you do)
$ make obj&&  make depend
$ sed -i.bak 's/cpu_quirks;/cpu_quirks = CPU_QUIRK_NO_BM_CTRL;/' acpi_cpu_cstate.c&&  make
(see if there's no compilation errors, and ...)
$ su root -c 'make install'
Cheers.