Re: [REGRESSION] 6.19.4 stable netfilter / nftables -> resolved

[Genes Lists <lists@sapience.com>]

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On Fri, 2026-02-27 at 09:13 +0100, Florian Westphal wrote:
> Thorsten Leemhuis <regressions@leemhuis.info> wrote:
> > On 2/27/26 04:46, Genes Lists wrote:
> > > I have a problem with nftables not working on 6.19.4 
> > 
> > Thx for the report. A problem that from a brief look seems to be
> > similar
> > ist already discussed and was bisected in this thread:
> > 
> > https://lore.kernel.org/all/bb9ab61c-3bed-4c3d-baf0-
> > 0bce4e142292@moonlit-rail.com/
> 
> Thanks for this pointer.
> 
> Can someone check if 'git cherry-pick
> f175b46d9134f708358b5404730c6dfa200fbf3c'
> makes things work again post 6.19.4?
> 
> Its a missing indirect dependency.

Summary now that all is resolved.

There were, coincidently, 2 separate issues.
Pure serendipity they happened together.

 a) kernel 6.19.4 netfilter oops [1]
    which is fixed by   
	f175b46d9134f708358b5404730c6dfa200fbf3c
 
 b) nftables with large sets 
    nft reports spurious error:
    rule could not be loaded: File exists
    After which no rules are loaded.

    Fixed in nftables git repo by commit:
    ---
    commit e83e32c8d1cd228d751fb92b756306c6eb6c0759
    Author: Pablo Neira Ayuso <pablo@netfilter.org>
    Date:   Mon Jan 12 12:59:26 2026 +0100

    mnl: restore create element command with large batches
    
    The rework to reduce memory consumption has introduced a
    bug that result in spurious EEXIST with large batches.
    ---

    This happens with kernels :
    - 6.19.4 + netfilter commit f175b46d9134f7
    - 7.0-rc1
    - linux-next
 
    It does not seem to happen with older kernels (assuming I 
    did not mess up the testing!)

    I confirmed this 2nd issue is resolved in both 
    - nftables git head and
    - v1.1.6 plus
      git cherry-pick \
       a9ead6a808dbe637ae7b9f54598f0dff9582d34d \
       e83e32c8d1cd228d751fb92b756306c6eb6c0759


thanks all.

gene


[1] 
https://lore.kernel.org/all/bb9ab61c-3bed-4c3d-baf0-0bce4e142292@moonlit-rail.com/

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