Re: [block, blk] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028

[Tejun Heo]

On Tue, Jun 24, 2014 at 12:01:22PM +0800, Jet Chen wrote:
> Hi Tejun,
> 
> we noticed the below changes on
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git review-mq-percpu_ref
> commit c924ec35e72ce0d6c289b858d323f7eb3f5076a5 ("block, blk-mq: draining can't be skipped even if bypass_depth was non-zero")

Yeah, this is from trying to drain NULL root blkcg.  It's hit from
another path too and will soon be fixed.

Thanks!

-- 
tejun
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