linux-kernel - Re: [PATCH] sched/fair: do not announce throttled next buddy in dequeue_task

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Message-ID: <CANRm+Cxo1q-GyWcSQfZ3S=FAL8opCi0uH=NVJcEFiLyf8dCbVQ@mail.gmail.com>
Date:	Mon, 11 Jul 2016 15:25:34 +0800
From:	Wanpeng Li <kernellwp@...il.com>
To:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	stable@...r.kernel.org
Subject: Re: [PATCH] sched/fair: do not announce throttled next buddy in dequeue_task_fair

2016-06-16 20:57 GMT+08:00 Konstantin Khlebnikov <khlebnikov@...dex-team.ru>:
> Hierarchy could be already throttled at this point. Throttled next
> buddy could trigger null pointer dereference in pick_next_task_fair().

There is cfs_rq->next check in pick_next_entity(), so how can null
pointer dereference happen?

Regards,
Wanpeng Li