linux-kernel - Re: [PATCH] sched/fair: Fix null pointer dereference of empty queues

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Message-ID: <1432586334.11346.2.camel@twins>
Date:	Mon, 25 May 2015 22:38:54 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mohammed Naser <mnaser@...xhost.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com
Subject: Re: [PATCH] sched/fair: Fix null pointer dereference of empty queues

On Mon, 2015-05-25 at 14:00 -0400, Mohammed Naser wrote:
> Calling put_prev_task() can result in nr_running being updated
> to zero, which would then crash the system when the kernel
> attempts to pick_next_entity() with an empty queue.

Getting to pick_next_entity() with an empty queue is a bug.

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