On Mon, 11 Jul 2011, Mike Snitzer wrote: > [cc'ing dm-devel, vivek and tejun] > > On Fri, Jul 8, 2011 at 7:04 PM, Roland Dreier <roland@xxxxxxxxxx> wrote: > > From: Roland Dreier <roland@xxxxxxxxxxxxxxx> > > > > This fixes crashes such as the below that I see when the storage > > underlying a dm-multipath device is hot-removed. �The problem is that > > dm requeues a request to a device whose block queue has already been > > cleaned up, and blk_insert_cloned_request() doesn't check if the queue > > is alive, but rather goes ahead and tries to queue the request. �This > > ends up dereferencing the elevator that was already freed in > > blk_cleanup_queue(). > > Your patch looks fine to me: > Acked-by: Mike Snitzer <snitzer@xxxxxxxxxx> There's still the issue that Stefan Richter pointed out: The test for a dead queue must be made _after_ acquiring the queue lock, not _before_. Alan Stern
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