From: Nikolay Aleksandrov <niko...@cumulusnetworks.com>
Date: Sun, 25 Sep 2016 23:08:31 +0200
> Since the commit below the ipmr/ip6mr rtnl_unicast() code uses the portid
> instead of the previous dst_pid which was copied from in_skb's portid.
> Since the skb is new the portid is 0 at that point so the packets are sent
> to the kernel and we get scheduling while atomic or a deadlock (depending
> on where it happens) by trying to acquire rtnl two times.
> Also since this is RTM_GETROUTE, it can be triggered by a normal user.
>
> Here's the sleeping while atomic trace:
...
> Fixes: 2942e9005056 ("[RTNETLINK]: Use rtnl_unicast() for rtnetlink unicasts")
> Signed-off-by: Nikolay Aleksandrov <niko...@cumulusnetworks.com>
This approach looks fine to me, applied and queued up for -stable.
