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When destroying an arc_buf_hdr_t its identity cannot be discarded until it is entirely undiscoverable. This not only includes being unhashed, but also being removed from the l2arc header list. Discarding the header's identify prematurely renders the hash lock useless because it will always hash to bucket zero. This change resolves a race with l2arc_evict() by discarding the identity after it has been removed from the l2arc header list. This ensures either the header is not on the list or contains the correct identify. Reviewed-by: Tom Caputi <tcaputi@datto.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes openzfs#7688 Closes openzfs#8144
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