Messages in this thread |  | | From | Tahsin Erdogan <> | Date | Mon, 10 Oct 2016 07:52:05 -0700 | Subject | Re: dm: free io_barrier after blk_cleanup_queue call |
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On Mon, Oct 10, 2016 at 6:25 AM, Mike Snitzer <snitzer@redhat.com> wrote: > I have to believe this was born out of code inspection rather than > actual need (due to crash, etc)?
This got originated from several crashes I have seen with 4.3 kernel. The crashes were caused by null dereferencing of io_barrier->per_cpu_ref.
The issue may no longer be relevant after commit c91852ff0815 ("dm: optimize dm_request_fn()") because conditions for accessing io_barrier may not longer exist. But fix should be considered for forked stable trees.
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