Kernel panic when unpluggin AC adaptor

[David DEMELIER]

2010/5/26 Giovanni Trematerra <giovanni.trematerra at gmail.com>:
> On Wed, May 26, 2010 at 3:55 PM, Giovanni Trematerra
> <giovanni.trematerra at gmail.com> wrote:
>> On Wed, May 26, 2010 at 12:01 PM, David DEMELIER
>> <demelier.david at gmail.com> wrote:
>>> 2010/5/26 Giovanni Trematerra <giovanni.trematerra at gmail.com>:
>>>> On Wed, May 26, 2010 at 11:14 AM, David DEMELIER
>>>> <demelier.david at gmail.com> wrote:
>>>>> 2010/5/25 Giovanni Trematerra <giovanni.trematerra at gmail.com>:
>>>>>> On Tue, May 25, 2010 at 5:52 PM, David DEMELIER
>>>>>> <demelier.david at gmail.com> wrote:
>>>>>>> 2010/5/25 Giovanni Trematerra <giovanni.trematerra at gmail.com>:
>>>>>>>> On Mon, May 24, 2010 at 9:43 PM, David DEMELIER
>>>>>>>> <demelier.david at gmail.com> wrote:
>>>>>>>>> 2010/5/12 Giovanni Trematerra <giovanni.trematerra at gmail.com>:
>>>>>>>>>> On Fri, May 7, 2010 at 8:33 PM, Demelier David <demelier.david at gmail.com> wrote:
>>>>>>>>>>> Le Vendredi 07 mai 2010 à 18:22 +0200, Giovanni Trematerra a écrit :
>>>>>>>>>>>> On Fri, May 7, 2010 at 2:08 PM, Demelier David <demelier.david at gmail.com> wrote:
>>>>>>>>>>>> > Hi,
>>>>>>>>>>>> >        I noticed that pluggin the AC adaptor when I boot without it does not
>>>>>>>>>>>> >        panic. It only panic when removing it.
>>>>>>>>>>>> >
>>>>>>>>>>>> >        Maybe 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  via 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.
>>>>>>>
>>>>>>
>>>>>> This is an old one. Could you try acpi_idle5.diff.txt? I kept you in
>>>>>> Cc when I sent to
>>>>>> the list. If you have problems, let me know, I'll resend to you  the patch.
>>>>>>
>>>>>> Thank you.
>>>>>>
>>>>>
>>>>> Hi, it panic'ed with the same backtrace.
>>>>>
>>>>
>>>> Can you please post your dmesg?
>>>>
>>>
>>> Sent !
>>
>> As your PC is in a good mood to make test, :)
>> could you try this patch?
>>
>> Thank you
>>
>> --
>> Gianni
>>
>
> Here the patch :(
>

Sorry, still the same :-(

-- 
Demelier David