linux-kernel - Re: [Bug 20032] New: 2.6.36-rc7 continuos kernel panics due to of cpu_idle (and cpu_intel

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Date:	Sun, 17 Oct 2010 21:13:48 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	LKML <linux-kernel@...r.kernel.org>
cc:	Patrizio Bassi <patrizio.bassi@...il.com>,
	Len Brown <lenb@...nel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [Bug 20032] New: 2.6.36-rc7 continuos kernel panics due to of
 cpu_idle (and cpu_intel_idle)

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On Sun, 10 Oct 2010, bugzilla-daemon@...zilla.kernel.org wrote:

> Subject    : 2.6.36-rc7 continuos kernel panics due to of cpu_idle (and
> cpu_intel_idle)
> Submitter  : Patrizio Bassi <patrizio.bassi@...il.com>
> Date       : 2010-10-08 18:23
> Message-ID : AANLkTi=2irM5tM2rNC5wHVV=Nw4cs_CK59pvXDD+Y5Dz@...l.gmail.com
> References : http://marc.info/?l=linux-kernel&m=128656222919323&w=2
> 
> This entry is being used for tracking a regression from 2.6.35.  Please don't
> close it until the problem is fixed in the mainline.
>
>> I have strong suspects around CONFIG_CPU_IDLE setting provoking
>> several kernel panics. All panics have the cpu_idle function involved.
>> I don't know how to reproduce, it happened every 2-3 hrs using firefox browser.
>> 
>> System with 2.6.35.5 is totally stable.
>> 
>> I took a snapshot of a panic here:
>> http://www.patriziobassi.it/downloads/DSC03364.JPG

The machine crashes in __alloc_skb called from
neigh_timer_handler. Which makes no sense at all. That looks more like
memory corruption.

>> 
>> Situation is dramatically worse when CONFIG_INTEL_IDLE is set.
>> Here panic happens even during startup.

Len, Suresh ???

Thanks,

	tglx
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