Bug#1130336: linux-image-6.12.73+deb13-amd64: Network failure beyond first connection

From	Salvatore Bonaccorso <carnil@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1130336: linux-image-6.12.73+deb13-amd64: Network failure beyond first connection
Date	2026-03-11 17:50 +0100
Message-ID	<MxuUV-6GS4-1@gated-at.bofh.it> (permalink)
References	(3 earlier) <MxurU-6GGS-13@gated-at.bofh.it> <MxoFP-6CU8-7@gated-at.bofh.it> <MxuUV-6GS4-5@gated-at.bofh.it> <MxoFP-6CU8-7@gated-at.bofh.it> <MxuUV-6GS4-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Control: tags -1 - moreinfo
Control: tags -1 + confirmed
Control: found -1 6.19.6-1

Hi Alejandro,

On Wed, Mar 11, 2026 at 05:32:00PM +0100, Alejandro Oliván Alvarez wrote:
> Hi.
> 
> I probably will succeed installing a given kernel from backports. OTOH
> I've never messed with unstable (I have never though on bring a kernel
> to a stable system).
> 
> Notice though that I CAN FULLY REPRODUCE the exact same issue on
> oldstable Bookworm:
> Until 6.1.0-42, iptables connection limit DoS rule worked as always
> did, whereas from 6.1.0-43 upgrading results in unusable networking.
> commenting out the rule and reloading iptables makes networking work
> again.
> 
> Will report as (if) I have something.
> Cheers.

No need to test 6.19.6-1 explicitly, with your rule I can reproduce
the problem on my own and looks to be present as well on 6.19.6-1.

Will double-check once more and then possibly approach upstream with
your report.

Regards,
Salvatore

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Bug#1130336: linux-image-6.12.73+deb13-amd64: Network failure beyond first connection Alejandro Olivan Alvarez <alejandro.olivan.alvarez@gmail.com> - 2026-03-11 11:10 +0100
  Bug#1130336: linux-image-6.12.73+deb13-amd64: Network failure beyond first connection Salvatore Bonaccorso <carnil@debian.org> - 2026-03-11 11:20 +0100
  Processed: Re: Bug#1130336: linux-image-6.12.73+deb13-amd64:  Network failure beyond first connection "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-03-11 11:20 +0100
  Processed: Re: Bug#1130336: linux-image-6.12.73+deb13-amd64:  Network failure beyond first connection "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-03-11 12:20 +0100
  Processed: Re: Bug#1130336: linux-image-6.12.73+deb13-amd64:  Network failure beyond first connection "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-03-11 17:20 +0100
  Bug#1130336: linux-image-6.12.73+deb13-amd64: Network failure beyond first connection Salvatore Bonaccorso <carnil@debian.org> - 2026-03-11 17:50 +0100
  Processed: Re: Bug#1130336: linux-image-6.12.73+deb13-amd64:  Network failure beyond first connection "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-03-11 17:50 +0100
  Processed: [regression] Network failure beyond first connection  after 69894e5b4c5e ("netfilter: nft_connlimit: update the count if add was  skipped") "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-03-14 15:10 +0100
  Bug#1130336: [regression] Network failure beyond first connection after 69894e5b4c5e ("netfilter: nft_connlimit: update the count if add was skipped") Florian Westphal <fw@strlen.de> - 2026-03-14 20:40 +0100
  Bug#1130336: [regression] Network failure beyond first connection after 69894e5b4c5e ("netfilter: nft_connlimit: update the count if add was skipped") Salvatore Bonaccorso <carnil@debian.org> - 2026-03-18 14:00 +0100

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