Re: Kernel panic when unpluggin AC adaptor

On Mon, May 24, 2010 at 9:43 PM, David DEMELIER
<[e-mail]> wrote:
> 2010/5/12 Giovanni Trematerra <[e-mail]>:
>> On Fri, May 7, 2010 at 8:33 PM, Demelier David <[e-mail]=
> wrote:
>>> Le Vendredi 07 mai 2010 =E0 18:22 +0200, Giovanni Trematerra a =E9crit =
:
>>>> On Fri, May 7, 2010 at 2:08 PM, Demelier David <demelier.david@gmail.c=
om> wrote:
>>>> > Hi,
>>>> > =A0 =A0 =A0 =A0I noticed that pluggin the AC adaptor when I boot wit=
hout it does not
>>>> > =A0 =A0 =A0 =A0panic. It only panic when removing it.
>>>> >
>>>> > =A0 =A0 =A0 =A0Maybe that could help ?
>>>> >
>>>>
>>>> Good to know. The problem lies somewhere when performance state change=
..
>>>> In your case it happens when you remove AC adaptor. Let's hope someone=
 on
>>>> acpi@ ml comes up with a good idea.
>>>>
>>>
>>> Okay so for the moment no change, I'll wait for someone with an idea
>>> that could solve my problem. For me because the panic only happens when
>>> changing profile from ac plugged -> ac unplugged (and not the reverse) =
I
>>> would think it's a cpu related acpi issue.
>>>
>>
>> I looked deeper and it seems to me that when you unplug the AC
>> adapter, acpi_cpu_notify calls acpi_cpu_cx_cst that try to allocate a
>> new cx_ptr->p_lvlx =A0via acpi_PkgGas.
>> If acpi_PkgGas set cx_ptr->p_lvlx to NULL for any reasons you'll have
>> the panic that you reported.
>> A solution would be to set acpi_cpu_hook to NULL so acpi_cpu_idle won't =
call it.
>> I need some time to have a patch because of the possible race between
>> acpi_cpu_notify and
>> acpi_cpu_idle during set acpi_cpu_hook to NULL.
>> if you have time and want panic your system you could try the attached
>> patch, just to be
>> sure that we catch it.
>>
>
> Hi, it paniced today ! I don't know why it randomly panic but it did,
> the backtrace didn't change. There is a picture about the panic :
>
> http://img541.imageshack.us/img541/2773/dsc00388xa.jpg

What was you trying? acpi_idle5.diff.txt patch?
How did it panic? Unplugging AC adapter?

Thanks

--
Gianni
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