Re: [patch 1/2]block, cfq: fix empty queue crash caused by requestmerge

[Jens Axboe]

On 2011-12-16 02:52, Shaohua Li wrote:
> All requests of a queue could be merged to other requests of other queue.
> Such queue will not have request in it, but it's in service tree. This
> will cause kernel oops.
> I encounter a BUG_ON() in cfq_dispatch_request() with next patch, but the
> issue should exist without the patch.

Good catch, yes I think this could happen if you just happen to have a
very deliberate/unlucky set of processes and timings. Applied.


-- 
Jens Axboe

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