Re: [PATCH] block: deal with stale req count of plug list

[Jens Axboe]

On 11/16/2016 03:07 AM, Ming Lei wrote:
> In both legacy and mq path, req count of plug list is computed
> before allocating request, so the number can be stale when falling
> back to slept allocation, also the new introduced wbt can sleep
> too.
>
> This patch deals with the case by checking if plug list becomes
> empty, and fixes the KASAN report of 'BUG: KASAN: stack-out-of-bounds'
> which is introduced by Shaohua's patches of dispatching big request.

Thanks Ming, added for 4.10.

--
Jens Axboe