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Message-ID: <CAM_iQpU8rBnJEk7NRdJ9bBan93BpjFPeVV7Yz9QSb0O-O+=BtQ@mail.gmail.com> Date: Wed, 3 May 2017 20:55:31 -0700 From: Cong Wang <xiyou.wangcong@...il.com> To: David Ahern <dsahern@...il.com> Cc: Andrey Konovalov <andreyknvl@...gle.com>, "David S. Miller" <davem@...emloft.net>, Alexey Kuznetsov <kuznet@....inr.ac.ru>, James Morris <jmorris@...ei.org>, Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>, Patrick McHardy <kaber@...sh.net>, netdev <netdev@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, Dmitry Vyukov <dvyukov@...gle.com>, Kostya Serebryany <kcc@...gle.com>, Eric Dumazet <edumazet@...gle.com>, syzkaller <syzkaller@...glegroups.com> Subject: Re: net/ipv6: GPF in rt6_device_match On Wed, May 3, 2017 at 7:43 PM, David Ahern <dsahern@...il.com> wrote: > On 5/3/17 5:35 PM, Cong Wang wrote: >> Ah, we need: >> >> @@ -4024,7 +4027,7 @@ static struct pernet_operations ip6_route_net_late_ops = { >> >> static struct notifier_block ip6_route_dev_notifier = { >> .notifier_call = ip6_route_dev_notify, >> - .priority = 0, >> + .priority = -10, /* Must be called after addrconf_notify!! */ >> }; >> > > > It's not a notifier problem; the null_entry is created in ip6_route_init > which is an init function. Only init_net's null entry is created here. > > For network namespaces other than init_net, it is never initialized. See > ip6_route_net_init. I don't understand what you are talking about... It is obviously initialized in 3 places: 1) The template itself, as we use memdup() 2) Code around dst_init_metrics() in ip6_route_net_init() 3) ip6_route_dev_notify(), which is supposed to initialize it after loopback registers (the order needs to fix, as shown in my patch) Why not add a printk and play with my patch to see the difference?
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