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

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Message-ID: <20150905153439.GA18461@redhat.com>
Date:	Sat, 5 Sep 2015 16:34:39 +0100
From:	"Richard W.M. Jones" <rjones@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Josh Boyer <jwboyer@...oraproject.org>,
	Jeff Moyer <jmoyer@...hat.com>, msnitzer@...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

On Fri, Sep 04, 2015 at 09:42:44PM +0100, Richard W.M. Jones wrote:
> On Fri, Sep 04, 2015 at 01:13:02PM -0400, Tejun Heo wrote:
> > The only struct which is large enough for 0xbb8 offset is
> > request_queue.  Hmm.... can you please try the brute force debug patch
> > below and report the kernel log after the crash?
> 
> So the good(?) news is this bug is not reproducible with the Fedora
> kernel 4.3.0-0.rc0.git7.1.fc24.x86_64 (tested both with and without
> your patch).
> 
> I'll keep it running overnight just in case ..

In fact the bug does happen with 4.3.0-0.rc0.git7.1.fc24.x86_64, but
it's a bit rarer than before.

I'm now using your patch, and the output from the patch is attached.
I hope that helps - let me know if there's anything else you'd want me
to try.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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