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

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Date:   Tue, 4 Oct 2022 08:46:03 -0600
From:   Daniel Xu <dxu@...uu.xyz>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Martin KaFai Lau <martin.lau@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>, 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

Hi Jakub,

On Mon, Oct 03, 2022 at 09:49:41PM -0700, Jakub Kicinski wrote:
> On Mon, 3 Oct 2022 19:05:45 -0700 Jakub Kicinski wrote:
> > Hi Jiri,
> > 
> > I get the following warning after merging up all the trees:
> > 
> > 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
> > 
> > $ gcc --version
> > gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-15)
> > 
> > 
> > Is this known?
> 
> Also hit this:
> 
> WARN: multiple IDs found for 'nf_conn': 92168, 117897 - using 92168
> WARN: multiple IDs found for 'nf_conn': 92168, 121226 - using 92168

I believe this is now-fixed pahole bug. See:
https://lore.kernel.org/bpf/20220907023559.22juhtyl3qh2gsym@kashmir.localdomain/

That being said, I didn't manage to find a pahole commit that directly
addresses the issue, so maybe upgrading pahole perturbed enough things
for this warning to go away?

If the warning is back on pahole master I can take another look.

Thanks,
Daniel