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

From	Salvatore Bonaccorso <carnil@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1108860: linux-image-6.1.0-34-amd64: Wireguard fragmentation fails with VXLAN since kernel 6.1.0-34, causing network timeouts
Date	2025-07-14 21:40 +0200
Message-ID	<L8xbP-1ma-5@gated-at.bofh.it> (permalink)
References	(5 earlier) <L74EV-gFiY-3@gated-at.bofh.it> <L5xrH-fElJ-1@gated-at.bofh.it> <L8xbP-1ma-7@gated-at.bofh.it> <L5xrH-fElJ-1@gated-at.bofh.it> <L8xbP-1ma-7@gated-at.bofh.it>
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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?

Thanks a lot that is great news, so we have isolated the regression
commit already. I will try to assemble a regression report upstream
soon (after checking if it is already known, hopefully not missing a
report) and keep you in the loop.

Regards,
Salvatore

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Bug#1108860: linux-image-6.1.0-34-amd64: Wireguard fragmentation fails with VXLAN since kernel 6.1.0-34, causing network timeouts Salvatore Bonaccorso <carnil@debian.org> - 2025-07-06 21:10 +0200
  Bug#1108860: linux-image-6.1.0-34-amd64: Wireguard fragmentation fails with VXLAN since kernel 6.1.0-34, causing network timeouts Salvatore Bonaccorso <carnil@debian.org> - 2025-07-10 21:00 +0200
    Bug#1108860: linux-image-6.1.0-34-amd64: Wireguard fragmentation fails with VXLAN since kernel 6.1.0-34, causing network timeouts Salvatore Bonaccorso <carnil@debian.org> - 2025-07-14 21:40 +0200

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