linux-kernel - Re: kmemcheck in linux-next causes NULL pointer dereference at task_rq

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Message-Id: <1249933887.2501.62.camel@dhcp231-106.rdu.redhat.com>
Date:	Mon, 10 Aug 2009 15:51:27 -0400
From:	Eric Paris <eparis@...hat.com>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	linux-kernel@...r.kernel.org, penberg@...helsinki.fi, mingo@...e.hu
Subject: Re: kmemcheck in linux-next causes NULL pointer dereference at 
 task_rq_lock

On Mon, 2009-08-10 at 20:56 +0200, Vegard Nossum wrote:
> 2009/8/10 Eric Paris <eparis@...hat.com>:
> > I'm using 2.6.31-rc5-next-20090810 on a vmware server.  Originally I saw
> > messages about setting to one cpu, so I booted with maxcpu=1.  I get
> > this same panic with and without maxpu.  Booting with kmemcheck=0 boots
> > just fine.
> >
> > I have not tested kmemcheck in linus' tree but will start looking for a
> > working version now.  Any suggestions or things I should try?
> 
> Hi, thanks for the report, and for trying it out.
> 
> Does it crash with "kmemcheck=0 maxcpus=1" (it should be maxcpus, not
> maxcpu). This should be a simple way of determining whether it was
> kmemcheck or the existing maxcpus code, which we use, that broke.

I boots fine with kmemcheck=0

I did get the command line right.  maxcpus=1 kmemcheck=1 was the panic I
showed in the last message.

> If you can send config (off-list, probably), I will try to reproduce
> and investigate more tomorrow.

Will send it now.

Thanks.

-Eric

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