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

[Jens Axboe]

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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