netdev - Re: [Intel-wired-lan] [5.10] i40e/udp_tunnel: RTNL: assertion failed at net/ipv4/udp_tunnel

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Date:   Wed, 3 Feb 2021 09:08:42 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Pierre Cheynier <p.cheynier@...teo.com>,
        "Sokolowski, Jan" <jan.sokolowski@...el.com>
Cc:     "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [Intel-wired-lan] [5.10] i40e/udp_tunnel: RTNL: assertion
 failed at net/ipv4/udp_tunnel_nic.c

On Wed, 3 Feb 2021 16:05:40 +0000 Pierre Cheynier wrote:
> On Wed, 3 Feb 2021 16:25:12 +0100 Pierre Cheynier wrote:
> > On Wed, 3 Feb 2021 15:23:54 +0100 Sokolowski, Jan wrote:
> >   
> > > It has been mentioned that the error only appeared recently, after upgrade to 5.10.X. What's the last known working configuration it was tested on? A bisection could help us investigate.  
> > 
> > I unfortunately moved from one LTS to another, meaning I was in 5.4 before, and this UDP tunnel offloading feature landed in 5.9 as far as I know.
> > 
> > Maybe Jakub can give pointers to specific 5.9 or 5.10 kernel versions I can eventually try, so that I can help refine where this was introduced (or if it was present from the start)?  
> 
> So I think I was incorrect, the support of this infrastructure for i40e appears in 5.10.
> From what I'm seeing, and Jakub will confirm, I think this started with the
> initial implementation for i40e (see 40a98cb6f01f013b8ab0ce7b28f705423ee16836).

Yup! I'm pretty sure it's my conversion. The full commit quote upstream:

40a98cb6f01f ("i40e: convert to new udp_tunnel infrastructure")

It should trigger if you have vxlan module loaded (or built in) 
and then reload or re-probe i40e.

Let us know if you can't repro it should pop up pretty reliably.