Julien Grall <julien.grall@xxxxxxxxxx> wrote: > On 03/07/15 21:42, Florian Westphal wrote: > > I think it makes more sense to use __in6_dev_get() instead which doesn't > > take a reference. > > __in6_dev_get requires to hold rcu_read_lock or RTNL. My knowledge on > this code is very limited. Are we sure that one this lock is hold? At > first glance, I wasn't able to find one. All netfilter hooks are rcu_read_locked via nf_hook_slow(). BTW, netfilter patches should be sent to netfilter-devel@xxxxxxxxxxxxxxx.