netdev - Re: Fw: [Bug 197099] New: Kernel panic in interrupt [l2tp

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Date:   Wed, 4 Oct 2017 08:49:51 +0100
From:   James Chapman <jchapman@...alix.com>
To:     SviMik <svimik@...il.com>
Cc:     netdev@...r.kernel.org, Guillaume Nault <g.nault@...halink.fr>
Subject: Re: Fw: [Bug 197099] New: Kernel panic in interrupt [l2tp_ppp]

On 3 October 2017 at 08:27, James Chapman <jchapman@...alix.com> wrote:
> On 2 October 2017 at 19:35, SviMik <svimik@...il.com> wrote:
>> Hi, James!
>>
>> No, I'm suffering from kernel panics since I started using 4.x
>> kernels.
> It's interesting that you are seeing l2tp issues since switching to
> 4.x kernels. Are you able to try earlier kernels to find the latest
> version that works? I'm curious whether things broke at v3.15.

It's possible that this may be fixed by a patch that is already
upstream and merged for v4.14. The fix is from Guillaume Nault:

f3c66d4 l2tp: prevent creation of sessions on terminated tunnels

If it's possible that the L2TP server may try to create a session in a
tunnel that is being closed, this bug would be exposed.

Guillaume's fix isn't yet pushed to stable releases. Are you able to
try a v4.14-rc build?