linux-kernel - Re: [PATCH] writeback: verify that underlying dev exists before getting its name

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Message-ID: <20150904164729.GD25329@mtj.duckdns.org>
Date:	Fri, 4 Sep 2015 12:47:29 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	rostedt@...dmis.org, mingo@...hat.com, axboe@...com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] writeback: verify that underlying dev exists before
 getting its name

On Fri, Sep 04, 2015 at 12:45:18PM -0400, Sasha Levin wrote:
> We can't assume there is always an underlying device and must verify that
> as well. Otherwise, we'd deref a NULL ptr here.

Do you have backtrace of this happening?  There's a bug in cleanup
path which causes oops (patch is being tested) and this may just be a
symptom of the same problem.

Thanks.

-- 
tejun
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