linux-kernel - Re: changes caused by 0d11e6ac("blk-mq: fix use-after-free of request")

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Date:	Wed, 18 Dec 2013 11:29:30 +0100
From:	Matias Bjørling <m@...rling.me>
To:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>,
	Ming Lei <tom.leiming@...il.com>
CC:	Fengguang Wu <fengguang.wu@...el.com>,
	Huang Ying <ying.huang@...el.com>,
	Jens Axboe <axboe@...nel.dk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: changes caused by 0d11e6ac("blk-mq: fix use-after-free of request")

On 12/18/2013 09:50 AM, Yuanhan Liu wrote:
> Hi,
>
> FYI, we noticed some changes caused by 0d11e6ac("blk-mq: fix use-after-free of request"):
>

The blk-mq accounting was faulty up to that commit. We should compare 
the blk-mq with the previous block layer.

Could you try to revert the following patches:

f02b9ac virtio-blk: virtqueue_kick() must be ordered with other...
1cf7e9c virtio_blk: blk-mq support

and compare the two runs (upto 0d11e6ac applied, and the same, with the 
two patches reverted)

Thanks

<snip>
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