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Chunwei Chen
4442f60d8e
arc_prune_task uses a refcount to protect arc_prune_t, but it doesn't prevent the underlying zsb from disappearing if there's a concurrent umount. We fix this by force the caller of arc_remove_prune_callback to wait for arc_prune_taskq to finish. Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4687 Closes #4690