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