linux-kernel - Re: 2.6.26-git: NULL pointer deref in __switch

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Message-ID: <485375A1.5000805@trash.net>
Date:	Sat, 14 Jun 2008 09:39:13 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	Chuck Ebbert <cebbert@...hat.com>, x86@...nel.org
Subject: Re: 2.6.26-git: NULL pointer deref in __switch_to

Ingo Molnar wrote:
> * Suresh Siddha <suresh.b.siddha@...el.com> wrote:
>
>   
>> Somehow (as described below?) TS_USEDFPU is set but the fpu is not 
>> allocated or freed.
>>
>> Please try the appended patch.
>>     
>
> i've queued up your fix in tip/x86/urgent. (Git access coordinates: 
> http://people.redhat.com/mingo/tip.git/README)
>
> i'm wondering why this problem was not hit more frequently. Does it need 
> some special FPU use to trigger? Or does it need an exec() with the FPU 
> stack still active? (normally the FPU stack is empty at exec() time)

I've recently started running three lguest instances on that machine,
maybe that has something to do with it.


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