linux-kernel - Re: [PATCH v4] sched/numa: fix unsafe get_task_struct() in task_numa

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Message-ID: <20141110161656.GC10501@worktop.programming.kicks-ass.net>
Date:	Mon, 10 Nov 2014 17:16:56 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Kirill Tkhai <ktkhai@...allels.com>, linux-kernel@...r.kernel.org,
	Oleg Nesterov <oleg@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Vladimir Davydov <vdavydov@...allels.com>,
	Kirill Tkhai <tkhai@...dex.ru>
Subject: Re: [PATCH v4] sched/numa: fix unsafe get_task_struct() in
 task_numa_assign()

On Mon, Nov 10, 2014 at 11:09:29AM -0500, Sasha Levin wrote:
> On 11/10/2014 11:03 AM, Peter Zijlstra wrote:
> > On Fri, Nov 07, 2014 at 10:48:27PM -0500, Sasha Levin wrote:
> >> [  829.539183] BUG: spinlock recursion on CPU#10, trinity-c594/11067
> >> [  829.539203]  lock: 0xffff880631dd6b80, .magic: dead4ead, .owner: trinity-c594/11067, .owner_cpu: 13
> > 
> > Ooh, look at that. CPU#10 vs .owner_cpu: 13 on the _same_ task.
> > 
> > One of those again :/
> 
> Hum. I missed that one.
> 
> Hold on, but the magic here is fine and the owner pointer is fine, why would just the owner cpu
> be wrong?

I've no clue, but I've seen them before. Complete mystery that.
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