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

[Tejun Heo]

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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