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

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Message-ID: <20141019194314.GA3434@redhat.com>
Date:	Sun, 19 Oct 2014 21:43:14 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Kirill Tkhai <tkhai@...dex.ru>
Cc:	Kirill Tkhai <ktkhai@...allels.com>,
	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()

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.

Oleg.

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