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Mon, 02 Mar 2026 23:00:54 -0800 (PST) Message-ID: <9d110d860c0c7e110d018ea53a7666eba275da20.camel@gmail.com> Subject: Re: [REGRESSION] 6.19.4 stable netfilter / nftables [resolved] From: Jindrich Makovicka To: Genes Lists , Greg KH Cc: Thorsten Leemhuis , linux-kernel@vger.kernel.org, coreteam@netfilter.org, netfilter-devel@vger.kernel.org, Pablo Neira Ayuso , stable@vger.kernel.org, regressions@lists.linux.dev, "Kris Karas (Bug Reporting)" Date: Tue, 03 Mar 2026 08:00:54 +0100 In-Reply-To: References: <45f03b0b-fe8f-4942-bad1-3fbde03d4be1@leemhuis.info> <143e1a402ad78dd7076516a6ceb637f378310b16.camel@sapience.com> <10537f2b74da2b8a5cb8dc939f723291db39ff84.camel@sapience.com> <2026022755-quail-graveyard-93e8@gregkh> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2-8 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2026-02-27 at 08:39 -0500, Genes Lists wrote: > On Fri, 2026-02-27 at 05:17 -0800, Greg KH wrote: > > On Fri, Feb 27, 2026 at 08:12:59AM -0500, Genes Lists wrote: > > > On Fri, 2026-02-27 at 07:23 -0500, Genes Lists wrote: > > > > On Fri, 2026-02-27 at 09:00 +0100, Thorsten Leemhuis wrote: > > > > > Lo! > > > > >=20 > > > >=20 > > > > Repeating the nft error message here for simplicity: > > > >=20 > > > > =C2=A0Linux version 7.0.0-rc1-custom-1-00124-g3f4a08e64442 ... > > > > =C2=A0 ... > > > > =C2=A0 In file included from /etc/nftables.conf:134:2-44: > > > > =C2=A0 ./etc/nftables.d/set_filter.conf:1746:7-21: Error: > > > > =C2=A0 Could not process rule: File exists > > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 xx.xxx.xxx.x/23, > > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ^^^^^^^^^^^^^^^ > > > >=20 > > >=20 > > > Resolved by updating userspace. > > >=20 > > > I can reproduce this error on non-production machine and found > > > this > > > error is resolved by re-bulding updated nftables, libmnl and > > > libnftnl: > > >=20 > > > With these versions nft rules now load without error: > > >=20 > > > =C2=A0- nftables commit de904e22faa2e450d0d4802e1d9bc22013044f93 > > > =C2=A0- libmnl=C2=A0=C2=A0 commit 54dea548d796653534645c6e3c8577eaf7d= 77411 > > > =C2=A0- libnftnl commit 5c5a8385dc974ea7887119963022ae988e2a16cc > > >=20 > > > All were compiled on machine running 6.19.4. > >=20 > > Odd, that shouldn't be an issue, as why would the kernel version > > you > > build this on matter? > >=20 > > What about trying commit f175b46d9134 ("netfilter: nf_tables: add > > .abort_skip_removal flag for set types")? > >=20 > > thanks, > >=20 > > greg k-h >=20 > - all were rebuilt from git head=C2=A0 > =C2=A0 Have not had time to explore what specific change(s) > =C2=A0 triggered the issue yet. >=20 > - commit f175b46d9134 > =C2=A0 I can reproduce on non-production machine - will check this and > report back. I had a similar problem, solved by reverting the commit below. It fails only with a longer set. My wild guess is a closed interval with start address at the end of a chunk and end address at the beginning of the next one gets misidentified as an open interval. commit 12b1681793e9b7552495290785a3570c539f409d Author: Pablo Neira Ayuso Date: Fri Feb 6 13:33:46 2026 +0100 netfilter: nft_set_rbtree: validate open interval overlap Example set definition is here: https://bugzilla.kernel.org/show_bug.cgi?id=3D221158 Using nft from Debian unstable $ ./nft --version nftables v1.1.6 (Commodore Bullmoose #7) Regards, --=20 Jindrich Makovicka