From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [RFC] net: ipv6: hold locks around mrt->mfc6_cache_array[]
Date: Tue, 07 Apr 2015 18:24:09 -0400 (EDT)
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From: chas williams <3chas3@gmail.com>
Date: Mon, 06 Apr 2015 19:18:50 -0400

> setsocketopt() -> ip6mr_mfc_add() -> ip6mr_cache_resolved() -> ip6_mr_foward()
> needs some lock since it is going to read the cache array.

Nothing can change in the table while the RTNL mutex is held, which
these code paths have acquired.