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Date:	Sat, 5 Apr 2008 23:35:51 +0530
From:	"Sanjeev Aditya Naga" <sanjeev.kernel@...il.com>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Cc:	trenn@...e.de, "Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	"Li, Shaohua" <shaohua.li@...el.com>
Subject: Re: [>=2.6.23][BUG] Oops on power disconnection

Hello Venki,

On Fri, Apr 4, 2008 at 6:01 AM, Pallipadi, Venkatesh
<venkatesh.pallipadi@...el.com> wrote:
>
>
>
>  >-----Original Message-----
>  >From: Thomas Renninger [mailto:trenn@...e.de]
>  >Sent: Thursday, April 03, 2008 2:05 PM
>  >To: Sanjeev Aditya Naga
>  >Cc: Andrew Morton; linux-kernel@...r.kernel.org;
>  >linux-acpi@...r.kernel.org; Pallipadi, Venkatesh; Li, Shaohua
>  >Subject: Re: [>=2.6.23][BUG] Oops on power disconnection
>  >
>  >
>  >On Thu, 2008-04-03 at 21:45 +0530, Sanjeev Aditya Naga wrote:
>  >> Hello Thomas,
>  >>
>  >> On Wed, Apr 2, 2008 at 11:42 PM, Thomas Renninger
>  ><trenn@...e.de> wrote:
>  >> >
>  >> > On Wed, 2008-04-02 at 21:43 +0530, Sanjeev Aditya Naga wrote:
>  >> >  > Hello Thomas,
>  >> >  >
>  >> >  > > Hi,
>  >> >  > >
>  >> >  > >
>  >> >  > >  On Wed, 2008-04-02 at 18:38 +0530, Sanjeev Aditya Naga wrote:
>  >> >  > >  > Hello Andrew Morton,
>  >> >  > >  >
>  >> >  > >  > Greetings!
>  >> >  > >  >
>  >> >  > >  > Thank you for the update. Is there anything I can do
>  >> >  > >  > from my side?
>  >> >  > >  >
>  >> >  > >  > I thought it was a acpi (dsdt) problem. And based on
>  >> >  > >  > a tutorial, I have tried to extract, fix,
>  >recompile the dsdt
>  >> >  > >  > and use it with the kernel. But still I have the
>  >same problem.
>  >> >  > >  > Let me know if I shall attach the dsdt (original)
>  >decompiled
>  >> >  > >  > code, if that helps.
>  >> >  > >
>  >> >  > >  this could be due a general memory corruption
>  >problem through ACPICA.
>  >> >  > >  If you get different backtraces on reboots even you
>  >only modified things
>  >> >  > >  that do not have to do with the problem, it's
>  >probably that and related
>  >> >  > >  to:
>  >> >  > >  ´╗┐http://bugzilla.kernel.org/show_bug.cgi?id=10339
>  >> >  > >
>  >> >  > >  You might want to try the latest kernel or the patch
>  >posted there.
>  >> >  >
>  >> >  > Thank you for the update.
>  >> >  > I have checked the bug and unfortunately its not the
>  >> >  > same issue. Things work absolutely fine, when I'm
>  >> >  > running on AC power. It even displays the exact
>  >> >  > battery (and charging) status to me. It messes up
>  >> >  > when suddenly AC power gets disconnected and
>  >> >  > switches to battery mode (The time when I get Oops).
>  >> >  > The system is still usable after switching to battery
>  >> >  > mode and I still get correct battery stats until its
>  >> >  > completely discharged. However most of the commands
>  >> >  > like kill, poweroff, java doesn't work after the Oops.
>  >> >  The bug is not related to battery, but to AML parsing and
>  >can therefore
>  >> >  affect anything which is ACPI related.
>  >> >
>  >> >
>  >> >  > BTW there is one similarity with the referenced bug.
>  >> >  > If I boot the computer without AC Power, it gives the
>  >> >  > same Oops and stops during booting itself.
>  >> >  >
>  >> >  > I shall try the latest kernel once and shall update you.
>  >> >  That would be great.
>  >> >  If it works, please give the patch there a try, IMO this
>  >one should see
>  >> >  2.6.2[34].X stable kernels soon.
>  >>
>  >> I have got the lastest kernel 2.6.25-rc8 today. I observed that
>  >> the referenced patch is already in the kernel. However this didn't
>  >> solve the problem in question. I get the same Oops on this kernel
>  >> as well. Find the latest dmesg along with the Oops:
>  >Ok.
>  >Maybe best is you document the backtraces/oopses with kernel
>  >versions at
>  >bugzilla.kernel.org and add dmesg and acpidump.
>  >It seems your machine notifies OS that the C-state table changed.
>  >AFAIK this is rare and there might be a general bug in the
>  >cpuidle layer
>  >which I do not know well.
>  >Best you add Venkatesh and Shaohua Li <shaohua.li@...el.com> to CC of
>  >the bug.
>  >While the backtrace shows a lot, cpuidle IMO is missing a general debug
>  >option like in the cpufreq layer.
>  >I couldn't find a single printk in the whole cpuidle/{cpuidle,sysfs}.c
>  >files, even on error paths. ´╗┐Also in the cpuidle specific parts of
>  >drivers/acpi/processor_idle.c some debug printks may help for
>  >future bug
>  >reports. It is very hard to guess what happened...
>  >
>
>  This looks like cpuidle and kobject interaction.
>  The latest oops looks different from the original one. Latest one is a
>  warn_on in lib/kref.c:43
>
>  We (Me or Shaohua) will take a deeper look at get back on this.


Thank you for the update. Let me know if I can be of any help!

Kind Regards,
Sanjeev

>
>  Thanks,
>  Venki
>
>

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