linux-kernel - bpfilter: write fail messages with 5.15.x and centos 7.9.2009

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Message-ID: <71e27b99-ef9c-4563-833d-e6eab5419cdb@diagnostix.dwd.de>
Date:   Wed, 29 Dec 2021 13:27:58 +0000 (GMT)
From:   Holger Kiehl <Holger.Kiehl@....de>
To:     linux-kernel <linux-kernel@...r.kernel.org>
cc:     Christoph Hellwig <hch@....de>
Subject: bpfilter: write fail messages with 5.15.x and centos 7.9.2009

Hello,

I just upgraded the kernel from 5.10.x to 5.15.12 on an old Centos
7.9.2009 server. The kernel is build on a new fedora 35 system
via 'make binrpm-pkg'. With this I see the following errors:

    [  232.140766] bpfilter: Loaded bpfilter_umh pid 6327
    [  232.152144] bpfilter: write fail -32
    [  232.187175] bpfilter: Loaded bpfilter_umh pid 6330
    [  232.198540] bpfilter: write fail -32
    [  232.234604] bpfilter: Loaded bpfilter_umh pid 6332
    [  232.245916] bpfilter: write fail -32
    [  232.281883] bpfilter: Loaded bpfilter_umh pid 6337
    [  232.293222] bpfilter: write fail -32
    [  232.335798] bpfilter: Loaded bpfilter_umh pid 6380
    [  232.347157] bpfilter: write fail -32
    [  244.411821] bpfilter: Loaded bpfilter_umh pid 6712
    [  244.423216] bpfilter: write fail -32

These appear as soon as something is done via iptables (setting
something or just viewing). Is this something I need to worry
about? Under 5.10.81 I did not see these messages.

In Jul 2020 I see a similar report 'bpfilter logging write errors in
dmesg', but could not find a solution.

Any hint what I can do to fix this?

Thanks,
Holger