Re: [BUG] 2.6.39.1 crash in scsi_dispatch_cmd()

Roland Dreier
2011-07-06T18:08:09Z

On Wed, Jul 6, 2011 at 9:53 AM, Alan Stern <stern@rowland.harvard.edu> wrote:
> He probably meant blk_execute_rq_nowait().  The test has to be done
> before the elevator is accessed.

Hmm, seems we would need the test in multiple places, since my second call
trace is io_schedule -> blk_flush_plug_list -> queue_unplugged ->
__blk_run_queue

So I don't think I hit blk_execute_rq_nowait in my crash.

But maybe the problem is that dm-multipath is trying to requeue the IO to an
underlying sdX device that is already dead?

- R.
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