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From:   Alexei Starovoitov <alexei.starovoitov@gmail.com>
Date:   Sat, 27 Mar 2021 15:53:54 -0700
Message-ID: <CAADnVQJoeEqZK8eWfCi-BkHY4rSzaPuXYVEFvR75Ecdbt+oGgA@mail.gmail.com>
Subject: Re: [PATCH v2 bpf-next 00/14] bpf: Support calling kernel function
To:     Cong Wang <xiyou.wangcong@gmail.com>
Cc:     Martin KaFai Lau <kafai@fb.com>, bpf <bpf@vger.kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        kernel-team <kernel-team@fb.com>,
        Linux Kernel Network Developers <netdev@vger.kernel.org>
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On Sat, Mar 27, 2021 at 3:08 PM Cong Wang <xiyou.wangcong@gmail.com> wrote:
>   BTFIDS  vmlinux
> FAILED unresolved symbol cubictcp_state
> make: *** [Makefile:1199: vmlinux] Error 255
>
> I suspect it is related to the kernel config or linker version.
>
> # grep TCP_CONG .config
> CONFIG_TCP_CONG_ADVANCED=y
> CONFIG_TCP_CONG_BIC=m
> CONFIG_TCP_CONG_CUBIC=y
..
>
> # pahole --version
> v1.17

That is the most likely reason.
In lib/Kconfig.debug
we have pahole >= 1.19 requirement for BTF in modules.
Though your config has CUBIC=y I suspect something odd goes on.
Could you please try the latest pahole 1.20 ?