Hello, hope I am now sending it to the correct list. Please, what else can I do to solve this? Thanks, Holger ---------- Forwarded message ---------- Date: Wed, 29 Dec 2021 13:27:58 +0000 (GMT) From: Holger Kiehl <Holger.Kiehl@xxxxxx> To: linux-kernel <linux-kernel@xxxxxxxxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxx> 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
