netdev - Re: iproute2 ss "RTNETLINK answers: Invalid argument" with 5.4 kernel

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Date:   Thu, 14 Jan 2021 18:34:28 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     "Rantala, Tommi T. (Nokia - FI/Espoo)" <tommi.t.rantala@...ia.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     "dsahern@...nel.org" <dsahern@...nel.org>
Subject: Re: iproute2 ss "RTNETLINK answers: Invalid argument" with 5.4
 kernel

On Thu, 2021-01-14 at 13:17 +0000, Rantala, Tommi T. (Nokia - FI/Espoo)
wrote:
> Hi,
> 
> Since iproute2 v5.9.0, running ss on LTS kernels (for example 5.4.y)
> produces error message in stderr (it's working otherwise fine, just printing
> this extra error):
> 
>   $ ss
>   RTNETLINK answers: Invalid argument
>   ...
> 
> Bisected to:
> 
> commit 9c3be2c0eee01be7832b7900a8be798a19c659a5
> Author: Paolo Abeni <pabeni@...hat.com>
> Date:   Fri Jul 10 15:52:35 2020 +0200
> 
>     ss: mptcp: add msk diag interface support
> 
> 
> As 5.4 does not have any mptcp support, it's not surprising that there is
> some EINVAL error. Any nice way to get rid of the error for LTS kernel
> users?

Thank you for reporting this! I'll try to have a look ASAP -
unfortunatelly can't be before next week.

Cheers,

Paolo