linux-kernel - Re: [patch 1/2]block, cfq: fix empty queue crash caused by request merge

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Date:	Fri, 16 Dec 2011 13:56:33 +0100
From:	Jens Axboe <axboe@...nel.dk>
To:	Shaohua Li <shaohua.li@...el.com>
CC:	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [patch 1/2]block, cfq: fix empty queue crash caused by request
 merge

On 2011-12-16 02:52, Shaohua Li wrote:
> All requests of a queue could be merged to other requests of other queue.
> Such queue will not have request in it, but it's in service tree. This
> will cause kernel oops.
> I encounter a BUG_ON() in cfq_dispatch_request() with next patch, but the
> issue should exist without the patch.

Good catch, yes I think this could happen if you just happen to have a
very deliberate/unlucky set of processes and timings. Applied.


-- 
Jens Axboe

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