From: Eric Dumazet <eric.duma...@gmail.com> Date: Wed, 16 Mar 2016 17:22:07 -0700
> One of the issue is that IPV6_MTU getsockopt() will not check the dst, > but simply use __sk_dst_get() : It will then report old mtu. That's a bug. ipv4 does it right with a proper sk_dst_get() and so should ipv6.
