linux-kernel - Re: [BUG] CFS vs cpu hotplug

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Message-ID: <20080619211748.GB6180@osiris.ibm.com>
Date:	Thu, 19 Jun 2008 23:17:48 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, Avi Kivity <avi@...ranet.com>,
	linux-kernel@...r.kernel.org,
	Dmitry Adamushko <dmitry.adamushko@...il.com>
Subject: Re: [BUG] CFS vs cpu hotplug

On Thu, Jun 19, 2008 at 08:05:10PM +0200, Peter Zijlstra wrote:
> On Thu, 2008-06-19 at 18:19 +0200, Heiko Carstens wrote:
> > Hi Ingo, Peter,
> > 
> > I'm still seeing kernel crashes on cpu hotplug with Linus' current git tree.
> > All I have to do is to make all cpus busy (make -j4 of the kernel source is
> > sufficient) and then start cpu hotplug stress.
> > It usually takes below a minute to crash the system like this:
> > 
> > Unable to handle kernel pointer dereference at virtual kernel address 005a800000031000
> > Oops: 0038 [#1] PREEMPT SMP
> > Modules linked in:
> > CPU: 1 Not tainted 2.6.26-rc6-00232-g9bedbcb #356
> > Process swapper (pid: 0, task: 000000002fe7ccf8, ksp: 000000002fe93d78)
> > Krnl PSW : 0400e00180000000 0000000000032c6c (pick_next_task_fair+0x34/0xb0)
> 
> I presume this is:
> 
>                 se = pick_next_entity(cfs_rq);

Yes, that is correct. Sorry, missed to tell about this detail.
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