linux-kernel - Re: [PATCH v1 0/2] blk-mq: fix oops caused by CPU hotplug

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Message-ID: <55391D8C.1050505@fb.com>
Date:	Thu, 23 Apr 2015 10:27:56 -0600
From:	Jens Axboe <axboe@...com>
To:	Ming Lei <ming.lei@...onical.com>, <linux-kernel@...r.kernel.org>
CC:	Christoph Hellwig <hch@....de>, Al Viro <viro@...iv.linux.org.uk>,
	Maxim Patlasov <mpatlasov@...allels.com>
Subject: Re: [PATCH v1 0/2] blk-mq: fix oops caused by CPU hotplug

On 04/20/2015 08:00 PM, Ming Lei wrote:
> Hi Guys,
>
> Dongsu Park reported[1] that kernel oops can be triggered easily by
> CPU plug when there is pending I/O on virtio-scsi.
>
> Turns out two problems exist in blk-mq core code and both can trigger
> oops by CPU plug:
>          - timeout handling vs CPU hotplug, especially unmapped hw queue tags
>          is still touched by timeout handler
>          - in case of shared tags, there is one bug about setting and checking
>          hctx->tags during CPU hotplug
>
> The two patches fix the two problem, and Dongsu has verified that
> the oops is fixed with the two patches too.
>
> [1], http://marc.info/?t=142926389200008&r=1&w=2

Applied, thanks Ming!

-- 
Jens Axboe

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