linux-kernel - Re: [PATCH v6] NVMe: conversion to blk-mq

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Date:	Mon, 9 Jun 2014 23:35:00 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Jens Axboe <axboe@...com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	"Matias Bj??rling" <m@...rling.me>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Keith Busch <keith.busch@...el.com>,
	"Sam Bradshaw (sbradshaw)" <sbradshaw@...ron.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-nvme <linux-nvme@...ts.infradead.org>
Subject: Re: [PATCH v6] NVMe: conversion to blk-mq

On Mon, Jun 9, 2014 at 11:27 PM, Jens Axboe <axboe@...com> wrote:
> On 2014-06-09 08:59, Christoph Hellwig wrote:
>>
>> On Mon, Jun 09, 2014 at 08:08:50AM -0600, Jens Axboe wrote:
>>>>
>>>> [  487.704074] nvme 0000:00:07.0: Cancelling I/O 202 QID 1
>>>> [  487.717881] nvme 0000:00:07.0: Aborting I/O 202 QID 1
>>>> [  487.736093] end_request: I/O error, dev nvme0n1, sector 91532352
>>>> [  487.747378] nvme 0000:00:07.0: completed id 0 twice on queue 0
>>>>
>>>>
>>>> when running fio randread(libaio, iodepth:64) with more than 3 jobs.
>>>>
>>>> And looks no such failure when jobs is 1 or 2.
>>>
>>>
>>> It's a known issue, make sure you have this patch:
>>>
>>>
>>> https://urldefense.proofpoint.com/v1/url?u=http://git.kernel.dk/?p%3Dlinux-block.git%3Ba%3Dcommit%3Bh%3Df6be4fb4bcb396fc3b1c134b7863351972de081f&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=3JMVyziIyZtZ5cv9eWNLwQ%3D%3D%0A&m=MKK7A%2B9AnXXwtMV9YPSFEprXId0z0WLtd2JQPxnaNVc%3D%0A&s=45425e5d17390ae912457035ff081b95a7084725706ffe91166a1bdb25d8bf3d
>>
>>
>> So without this patch we can get duplicate completions?  That could
>> explain the issues that Robert sees with scsi-mq and hpsa..

Use-after-free may cause duplicate completions.

BTW, is the scsi-mq patchset public now?

Thanks,
-- 
Ming Lei
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