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From: Nathan Chancellor <nathan@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>
Cc: Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	Yonghong Song <yhs@fb.com>,
	John Fastabend <john.fastabend@gmail.com>,
	KP Singh <kpsingh@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	netdev@vger.kernel.org, bpf@vger.kernel.org,
	clang-built-linux@googlegroups.com,
	Veronika Kabatova <vkabatov@redhat.com>,
	Jiri Olsa <jolsa@kernel.org>
Subject: FAILED unresolved symbol vfs_truncate on arm64 with LLVM
Date: Mon, 8 Feb 2021 20:44:16 -0700	[thread overview]
Message-ID: <20210209034416.GA1669105@ubuntu-m3-large-x86> (raw)

Hi all,

Recently, an issue with CONFIG_DEBUG_INFO_BTF was reported for arm64:
https://groups.google.com/g/clang-built-linux/c/de_mNh23FOc/m/E7cu5BwbBAAJ

$ make -skj"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- \
                      LLVM=1 O=build/aarch64 defconfig

$ scripts/config \
    --file build/aarch64/.config \
    -e BPF_SYSCALL \
    -e DEBUG_INFO_BTF \
    -e FTRACE \
    -e FUNCTION_TRACER

$ make -skj"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- \
                      LLVM=1 O=build/aarch64 olddefconfig all
...
FAILED unresolved symbol vfs_truncate
...

My bisect landed on commit 6e22ab9da793 ("bpf: Add d_path helper")
although that seems obvious given that is what introduced
BTF_ID(func, vfs_truncate).

I am using the latest pahole v1.20 and LLVM is at
https://github.com/llvm/llvm-project/commit/14da287e18846ea86e45b421dc47f78ecc5aa7cb
although I can reproduce back to LLVM 10.0.1, which is the earliest
version that the kernel supports. I am very unfamiliar with BPF so I
have no idea what is going wrong here. Is this a known issue?

Cheers,
Nathan

             reply	other threads:[~2021-02-09  3:49 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-09  3:44 Nathan Chancellor [this message]
2021-02-09  4:45 ` FAILED unresolved symbol vfs_truncate on arm64 with LLVM Andrii Nakryiko
2021-02-09  5:23   ` Nathan Chancellor
2021-02-09  6:09     ` Andrii Nakryiko
2021-02-09  6:13       ` Andrii Nakryiko
2021-02-09  6:56         ` Andrii Nakryiko
2021-02-09  7:49           ` Nathan Chancellor
2021-02-09 12:36             ` Jiri Olsa
2021-02-09 15:09               ` Jiri Olsa
2021-02-09 16:13                 ` Jiri Olsa
2021-02-09 16:35                   ` Nathan Chancellor
2021-02-09 17:07                     ` Sedat Dilek
2021-02-09 17:12                       ` Nick Desaulniers
2021-02-09 17:26                         ` Sedat Dilek
2021-02-09 19:06                   ` Jiri Olsa
2021-02-09 19:22                     ` Jiri Olsa
2021-02-09 20:09                     ` Nick Desaulniers
2021-02-09 20:50                       ` Jiri Olsa
2021-02-09 21:41                         ` Jiri Olsa
2021-02-09 23:15                           ` Nathan Chancellor
2021-02-10  0:02                       ` Nathan Chancellor
2021-02-10  0:49                         ` Daniel Kiss
2021-02-10 11:34                         ` David Laight
2021-02-10 12:32                           ` Jiri Olsa
2021-02-09 20:59                 ` Andrii Nakryiko
2021-02-09 21:55                   ` Jiri Olsa
2021-02-09 22:00                     ` Andrii Nakryiko
2021-02-10 13:26                       ` Jiri Olsa
2021-02-10 18:02                         ` Nathan Chancellor
2021-02-10 18:20                         ` Andrii Nakryiko
2021-02-10 18:24                           ` Sedat Dilek
2021-02-10 19:10                           ` Jiri Olsa
2021-02-10 19:21                             ` Andrii Nakryiko
2021-02-10 20:13                           ` Jiri Olsa
2021-02-11 15:08                             ` Jiri Olsa
2021-02-11 15:43                               ` Sedat Dilek
2021-02-11 16:07                                 ` Jiri Olsa
2021-02-11 16:36                                   ` Sedat Dilek
2021-02-11 17:24                               ` Nathan Chancellor
2021-02-11 19:59                               ` Andrii Nakryiko
2021-02-11 21:47                                 ` Jiri Olsa
2021-02-12 16:38                                 ` Jiri Olsa
2021-02-12 19:22                                   ` Andrii Nakryiko
2021-02-12 21:29                                     ` Jiri Olsa

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