linux-kernel - selftests: net: l2tp.sh regression starting with 6.1-rc1

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Date:   Wed, 29 Mar 2023 14:24:14 +0200
From:   Andrea Righi <andrea.righi@...onical.com>
To:     Wojciech Drewek <wojciech.drewek@...el.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>,
        netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: selftests: net: l2tp.sh regression starting with 6.1-rc1

I noticed that l2tp.sh net selftest is failing in recent kernels with
the following error:

 RTNETLINK answers: Protocol not supported

See also: https://bugs.launchpad.net/bugs/2013014

Apprently the module lt2p_ipv6 is not automatically loaded when the test
is trying to create an l2tp ipv6 tunnel.

I did a bisect and found that the offending commit is this one:

 65b32f801bfb ("uapi: move IPPROTO_L2TP to in.h")

I've temporarily reverted this commit for now, any suggestion on how to
fix this properly?

Thanks,
-Andrea