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

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Message-ID: <1415635836.474.24.camel@tkhai>
Date:	Mon, 10 Nov 2014 19:10:36 +0300
From:	Kirill Tkhai <ktkhai@...allels.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Sasha Levin <sasha.levin@...cle.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()

В Пн, 10/11/2014 в 17:03 +0100, Peter Zijlstra пишет:
> 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 :/

We do not initialyse task_struct::numa_preferred_nid for INIT_TASK.
It there no a problem?


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