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
next reply other threads:[~2021-02-09 3:50 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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