Kernel panic when unpluggin AC adaptor

[Giovanni Trematerra]

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?

Thanks

--
Gianni