linux-kernel - Re: [PATCH v11] NVMe: Convert to blk-mq

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Date:	Thu, 14 Aug 2014 09:33:38 -0600 (MDT)
From:	Keith Busch <keith.busch@...el.com>
To:	Jens Axboe <axboe@...com>
cc:	Matias Bjørling <m@...rling.me>,
	Keith Busch <keith.busch@...el.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	"Sam Bradshaw (sbradshaw)" <sbradshaw@...ron.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-nvme <linux-nvme@...ts.infradead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Rob Nelson <rlnelson@...gle.com>,
	Ming Lei <tom.leiming@...il.com>
Subject: Re: [PATCH v11] NVMe: Convert to blk-mq

On Thu, 14 Aug 2014, Jens Axboe wrote:
> On 08/14/2014 02:25 AM, Matias Bjørling wrote:
>> The result is set to BLK_MQ_RQ_QUEUE_ERROR, or am I mistaken?
>
> Looks OK to me, looking at the code, 'result' is initialized to
> BLK_MQ_RQ_QUEUE_BUSY though. Which looks correct, we don't want to error
> on a suspended queue.

My mistake missing how the result was initialized.

> nr_tags must be uninitialized or screwed up somehow, otherwise I don't
> see how that kmalloc() could warn on being too large. Keith, are you
> running with slab debugging? Matias, might be worth trying.

I'm not running with slab debugging. If it's any clue at all, blk-mq is
using 16 of the 31 allocated h/w queues (which is okay as we discussed
earlier), and the oops happens when clearing the first unused queue.

I'll have time to mess with this more today, so I can either help find
the problem or apply a patch if one becomes available.