linux-kernel - Re: __blkg_lookup oops with 4.2-rcX

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Date:	Wed, 2 Sep 2015 11:32:55 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Josh Boyer <jwboyer@...oraproject.org>
Cc:	Jeff Moyer <jmoyer@...hat.com>, msnitzer@...hat.com,
	"Richard W.M. Jones" <rjones@...hat.com>,
	Li Zefan <lizefan@...wei.com>,
	Johannes Weiner <hannes@...xchg.org>, cgroups@...r.kernel.org,
	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>
Subject: Re: __blkg_lookup oops with 4.2-rcX

Hello,

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?

Thanks.

-- 
tejun
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