Re: __blkg_lookup oops with 4.2-rcX

From: Tejun Heo
Date: Wed Sep 02 2015 - 11:33:04 EST


On Wed, Sep 02, 2015 at 10:53:07AM -0400, Tejun Heo wrote:
> On Sun, Aug 30, 2015 at 08:30:41AM -0400, Josh Boyer wrote:
> I think the offending commit is 776687bce42b ("block, blk-mq: draining
> can't be skipped even if bypass_depth was non-zero"). It looks like
> the patch makes shutdown path travel data structure which is already
> destroyed. Will post the fix soon.

Hmm... I can't reproduce it here or see how such oops would happen.

* Is the problem reproducible on v4.2? If so, can you please describe
the steps to reproduce? How is cgroup set up?

* Can you please run gdb or addr2line on it and report which line is
causing the oops?


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