Re: Kernel panic when unpluggin AC adaptor

2010/5/25 Giovanni Trematerra <[e-mail]>:
> 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]=
m> wrote:
>>>> Le Vendredi 07 mai 2010 =C3=A0 18:22 +0200, Giovanni Trematerra a =C3=
=A9crit :
>>>>> On Fri, May 7, 2010 at 2:08 PM, Demelier David <demelier.david@gmail.=
com> wrote:
>>>>> > Hi,
>>>>> > =C2=A0 =C2=A0 =C2=A0 =C2=A0I noticed that pluggin the AC adaptor wh=
en I boot without it does not
>>>>> > =C2=A0 =C2=A0 =C2=A0 =C2=A0panic. It only panic when removing it.
>>>>> >
>>>>> > =C2=A0 =C2=A0 =C2=A0 =C2=A0Maybe that could help ?
>>>>> >
>>>>>
>>>>> Good to know. The problem lies somewhere when performance state chang=
e.
>>>>> In your case it happens when you remove AC adaptor. Let's hope someon=
e 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 whe=
n
>>>> 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 =C2=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?
>

Hi, I tried this one : lvlx.diff.txt. Yes by unplugging the AC adapter.

--=20
Demelier David
_______________________________________________
[e-mail] mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-stable
To unsubscribe, send any mail to "[e-mail]"