From: Hannes Frederic Sowa <han...@stressinduktion.org>
Date: Mon, 13 Mar 2017 00:00:26 +0100
> aszlig observed failing ssh tunnels (-w) during initialization since
> commit cc9da6cc4f56e0 ("ipv6: addrconf: use stable address generator for
> ARPHRD_NONE"). We already had reports that the mentioned commit breaks
> Juniper VPN connections. I can't clearly say that the Juniper VPN client
> has the same problem, but it is worth a try to hint to this patch.
>
> Because of the early generation of link local addresses, the kernel now
> can start asking for routers on the local subnet much earlier than usual.
> Those router solicitation packets arrive inside the ssh channels and
> should be transmitted to the tun fd before the configuration scripts
> might have upped the interface and made it ready for transmission.
>
> ssh polls on the interface and receives back a POLL_OUT. It tries to send
> the earily router solicitation packet to the tun interface. Unfortunately
> it hasn't been up'ed yet by config scripts, thus failing with -EIO. ssh
> doesn't retry again and considers the tun interface broken forever.
>
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=121131
> Fixes: cc9da6cc4f56 ("ipv6: addrconf: use stable address generator for
> ARPHRD_NONE")
> Cc: Bjørn Mork <bj...@mork.no>
> Reported-by: Valdis Kletnieks <valdis.kletni...@vt.edu>
> Cc: Valdis Kletnieks <valdis.kletni...@vt.edu>
> Reported-by: Jonas Lippuner <jo...@lippuner.ca>
> Cc: Jonas Lippuner <jo...@lippuner.ca>
> Reported-by: aszlig <asz...@redmoonstudios.org>
> Cc: aszlig <asz...@redmoonstudios.org>
> Signed-off-by: Hannes Frederic Sowa <han...@stressinduktion.org>
Applied and queued up for -stable.
