netdev - Re: WARN: multiple IDs found for 'nf_conn': 92168, 117897

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Date:   Sat, 22 Oct 2022 18:18:49 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Jiri Olsa <olsajiri@...il.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Martin KaFai Lau <martin.lau@...nel.org>,
        bpf <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: WARN: multiple IDs found for 'nf_conn': 92168, 117897 - using 92168

On Fri, Oct 21, 2022 at 10:38 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Fri, 21 Oct 2022 23:34:13 +0200 Jiri Olsa wrote:
> > > You are right, they should be identical once PTR is deduplicated
> > > properly. Sorry, was too quick to jump to conclusions. I was thinking
> > > about situations explained by Alan.
> > >
> > > So, is this still an issue or this was fixed by [0]?
> > >
> > >   [0] https://lore.kernel.org/bpf/1666364523-9648-1-git-send-email-alan.maguire@oracle.com/
> >
> > yes, it seems to be fixed by that
> >
> > Jakub,
> > could you check with pahole fix [1]?
>
> If you mean the warning from the subject then those do seem to be gone.
> But if I'm completely honest I don't remember how I triggered them in
> the first place :S There weren't there on every build for me.
>
> The objtool warning is still here:
>
> $ make PAHOLE=~/pahole O=build_allmodconfig/ -j 60 >/tmp/stdout 2>/tmp/stderr; \
>     cat /tmp/stderr
>
> vmlinux.o: warning: objtool: ___ksymtab+bpf_dispatcher_xdp_func+0x0: data relocation to !ENDBR: bpf_dispatcher_xdp_func+0x0
> vmlinux.o: warning: objtool: bpf_dispatcher_xdp+0xa0: data relocation to !ENDBR: bpf_dispatcher_xdp_func+0x0

The effect of the compiler bug was addressed by this fix:
https://lore.kernel.org/all/20221018075934.574415-1-jolsa@kernel.org/

It's in the bpf tree, but the warning will stay.
While the compiler is broken the objtool should keep complaining.