netdev - Re: [PATCH bpf-next v8 00/10] Introduce unstable CT lookup helpers

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Date:   Fri, 18 Feb 2022 21:19:04 +0100
From:   Alexander Egorenkov <Alexander.Egorenkov@....com>
To:     memxor@...il.com
Cc:     andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        brouer@...hat.com, daniel@...earbox.net, fw@...len.de,
        john.fastabend@...il.com, kafai@...com, maximmi@...dia.com,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        pablo@...filter.org, songliubraving@...com, toke@...hat.com,
        yhs@...com
Subject: Re: [PATCH bpf-next v8 00/10] Introduce unstable CT lookup helpers


Hi,

we are having a problem loading nf_conntrack on linux-next:

# modprobe nf_conntrack
modprobe: ERROR: could not insert 'nf_conntrack': Unknown symbol in module, or unknown parameter (see dmesg)
modprobe: ERROR: Error running install command '/sbin/modprobe --ignore-install nf_conntrack  && /sbin/sysctl --quiet --pattern 'net[.]netfilter[.]nf_conntrack.*' --system' for module nf_conntrack: retcode 1
modprobe: ERROR: could not insert 'nf_conntrack': Invalid argument

# dmesg
[ 3728.188969] missing module BTF, cannot register kfuncs
[ 3748.208674] missing module BTF, cannot register kfuncs
[ 3748.567123] missing module BTF, cannot register kfuncs
[ 3873.597276] missing module BTF, cannot register kfuncs
[ 3874.017125] missing module BTF, cannot register kfuncs
[ 3882.637097] missing module BTF, cannot register kfuncs
[ 3883.507213] missing module BTF, cannot register kfuncs
[ 3883.876878] missing module BTF, cannot register kfuncs

# zgrep BTF /proc/config.gz
CONFIG_DEBUG_INFO_BTF=y
CONFIG_PAHOLE_HAS_SPLIT_BTF=y
CONFIG_DEBUG_INFO_BTF_MODULES=y

It seems that nf_conntrack.ko is missing a .BTF section
which is present in debuginfo within
/usr/lib/debug/lib/modules/*/kernel/net/netfilter/nf_conntrack.ko.debug instead.

Am i correct in assuming that this is not supported (yet) ?

We use pahole 1.22 and build linux-next on Fedora 35 as a set of custom
packages. Architecture is s390x.

Thanks
Regards
Alex