On Wed, Jul 22, 2015 at 11:10:59AM +0900, YOSHIFUJI Hideaki wrote: > You have to take "some" lock when accessing neigh->nud_state > theoretically. I don't think read_lock can buy us a lot of extra protection either. If it has missed the train, the next ip6_pol_route() call will trigger rt6_probe(). There are other places checking nud_state without lock also.
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