Subject: Re: [PATCH net-next v2] selftests: net: add socat syslog for PPPoL2TP

From: Qingfang Deng <[email-masked]>
Date: Wed, 3 Jun 2026 13:35:43 +0800

On 2026/6/3 12:04, Matthieu Baerts wrote:
> Hi Qingfang,
> It looks like the issue happened once since this patch is being tested:
>
> https://netdev-ctrl.bots.linux.dev/logs/vmksft/net-extra/results/668501/11-pppol2tp-sh/stdout
>
> Is it enough for you to understand what's wrong and how to fix it?

Yes. Both pppd instances detected a false loopback, possibly because 
they happened to use the same PRNG seed to generate the magic number. 
I'll send a patch to disable this detection.

Regards,

Qingfang