netdev - Re: "resolve_btfids: unresolved symbol" warnings while building v5.17-rc1

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Message-ID: <CAADnVQ+ewS9WE3rS3LbhL4w1aND8v_JOvzKUK+ZuseGfk8Sdew@mail.gmail.com>
Date:   Tue, 25 Jan 2022 12:42:20 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Pavel Skripkin <paskripkin@...il.com>
Cc:     Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>
Subject: Re: "resolve_btfids: unresolved symbol" warnings while building v5.17-rc1

On Tue, Jan 25, 2022 at 12:29 PM Pavel Skripkin <paskripkin@...il.com> wrote:
>
> On 11/15/21 16:34, Pavel Skripkin wrote:
> > Hi, net/bpf developers!
> >
> > While building newest kernel for fuzzing I met following warnings:
> >
> > ```
> >     BTFIDS  vmlinux
> > WARN: resolve_btfids: unresolved symbol tcp_dctcp_kfunc_ids
> > WARN: resolve_btfids: unresolved symbol tcp_cubic_kfunc_ids
> > WARN: resolve_btfids: unresolved symbol tcp_bbr_kfunc_ids
> >     SORTTAB vmlinux
> >
> > ```
> >
> > I haven't seen such warnings before and have no idea are they important
> > or not. Config is attached.
> >
> > My host is openSUSE Tumbleweed with gcc (SUSE Linux) 10.3.1 20210707
> > [revision 048117e16c77f82598fca9af585500572d46ad73] if it's important :)
> >
> >
>
> Hi Kumar and other net/bpf developers!,
>
> while building v5.17-rc1 (0280e3c58f92b2fe0e8fbbdf8d386449168de4a8) with
> mostly random config I met this warning
>
> ```
> WARN: resolve_btfids: unresolved symbol bpf_lsm_task_getsecid_subj
> ```

Thanks for the report.
It's already fixed in bpf tree.