Bug#1108860: linux-image-6.1.0-34-amd64: Wireguard fragmentation fails with VXLAN since kernel 6.1.0-34, causing network timeouts

[rough.rock3059@datachamp.fr]

Hi,

Saw that. I will try to provide a reproducible setup with an Ansible playbook or something. Give me a few more days for that.

Thanks,
- Charles

On Tue, Jul 15, 2025, at 14:55, Salvatore Bonaccorso wrote:
> Hi Charles,
>
> On Sun, Jul 13, 2025 at 08:41:39AM +0200, rough.rock3059@datachamp.fr wrote:
>> Hi Salvatore,
>> 
>> Thank you for your guidance and for pointing out the relevant commit.
>> 
>> I have tested, checking out from tag 6.1.134:
>> - With the revert of commit b88786ea2c8f ("tunnels: Accept PACKET_HOST in skb_tunnel_check_pmtu()"): the issue does not appear and everything works as expected
>> - With the commit included (no revert), the issue reappears exactly as before.
>> 
>> This confirms that the regression is directly linked to this commit.
>> 
>> Is there anything else I can do or provide to help with the resolution?
>
> Btw, reported upstream (you are in CC) but there is need that you
> answer details on the setup and/or standalone reproducer. So any help
> you can provide there would be great.
>
> Regards,
> Salvatore