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

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Message-ID: <1413795794.19914.20.camel@tkhai>
Date:	Mon, 20 Oct 2014 13:03:14 +0400
From:	Kirill Tkhai <ktkhai@...allels.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	Kirill Tkhai <tkhai@...dex.ru>,
	Peter Zijlstra <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Vladimir Davydov <vdavydov@...allels.com>
Subject: Re: [PATCH] sched/numa: fix unsafe get_task_struct() in
 task_numa_assign()

В Вс, 19/10/2014 в 21:43 +0200, Oleg Nesterov пишет:
> On 10/19, Oleg Nesterov wrote:
> >
> > Forgot to mention... Or we can make task_struct_cachep SLAB_DESTROY_BY_RCU,
> > in this case ->curr (or any other "task_struct *" ponter) can not go away
> > under rcu_read_lock(). task_numa_compare() still needs the PF_EXITING check,
> > but we do not need to recheck ->curr or probe_kernel_read().
> 
> Damn, please ignore ;) we still need to recheck ->curr.

Yeah, this bug like "collect puzzle" :)


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