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Date:	Mon, 20 Oct 2014 13:03:14 +0400
From:	Kirill Tkhai <>
To:	Oleg Nesterov <>
CC:	Kirill Tkhai <>,
	Peter Zijlstra <>,
	"" <>,
	Ingo Molnar <>,
	Vladimir Davydov <>
Subject: Re: [PATCH] sched/numa: fix unsafe get_task_struct() in

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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