linux-kernel - Re: Error: failed to load BTF from vmlinux: No data available

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Message-ID: <CAEf4BzZ5CrQvOE-RwR1UuPMxuPaMzpQ_3z1Fnx3m_K0iLTE2RA@mail.gmail.com>
Date:   Tue, 16 May 2023 10:29:18 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     kernel test robot <lkp@...el.com>
Cc:     Changbin Du <changbin.du@...il.com>, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Andrii Nakryiko <andrii@...nel.org>
Subject: Re: Error: failed to load BTF from vmlinux: No data available

On Mon, May 15, 2023 at 7:43 PM kernel test robot <lkp@...el.com> wrote:
>
> Hi Changbin,
>
> FYI, the error/warning still remains.
>
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   f1fcbaa18b28dec10281551dfe6ed3a3ed80e3d6
> commit: acd3b7768048fe338248cdf43ccfbf8c084a6bc1 libbpf: Return -ENODATA for missing btf section
> date:   4 months ago
> compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
> reproduce:
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=acd3b7768048fe338248cdf43ccfbf8c084a6bc1
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout acd3b7768048fe338248cdf43ccfbf8c084a6bc1
>         make O=/tmp/kselftest headers
>         make O=/tmp/kselftest -C tools/testing/selftests
>
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@...el.com>
> | Link: https://lore.kernel.org/oe-kbuild-all/202305161058.hUHyPIjv-lkp@intel.com/
>
> All errors (new ones prefixed by >>):
>
>    libbpf: failed to find '.BTF' ELF section in vmlinux
> >> Error: failed to load BTF from vmlinux: No data available
> --
>    libbpf: failed to find '.BTF' ELF section in vmlinux
> >> Error: failed to load BTF from vmlinux: No data available
>    make[3]: *** [Makefile:204: tools/bpf/bpftool/vmlinux.h] Error 195
>    make[3]: *** Deleting file 'tools/bpf/bpftool/vmlinux.h'
>    make[2]: *** [Makefile:113: bpftool] Error 2
>    make[2]: *** Waiting for unfinished jobs....
>    libbpf: failed to find '.BTF' ELF section in vmlinux
> >> Error: failed to load BTF from vmlinux: No data available
>    make[3]: *** [Makefile:76: tools/bpf/runqslower//vmlinux.h] Error 195
>    make[3]: *** Deleting file 'tools/bpf/runqslower//vmlinux.h'
>    make[2]: *** [Makefile:122: runqslower] Error 2
>

Do you enable CONFIG_DEBUG_INFO_BTF=y for this test? retsnoop's
Makefile expects to find .BTF section in vmlinux image to be able to
compiler everything correctly.

> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests