From: Nathan Chancellor <nathan@kernel.org>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
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>,
Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
clang-built-linux <clang-built-linux@googlegroups.com>,
Veronika Kabatova <vkabatov@redhat.com>,
Jiri Olsa <jolsa@kernel.org>
Subject: Re: FAILED unresolved symbol vfs_truncate on arm64 with LLVM
Date: Mon, 8 Feb 2021 22:23:11 -0700 [thread overview]
Message-ID: <20210209052311.GA125918@ubuntu-m3-large-x86> (raw)
In-Reply-To: <CAEf4BzYnT-eoKRL9_Pu_DEuqXVa+edN5F-s+k2RxBSzcsSTJ1g@mail.gmail.com>
On Mon, Feb 08, 2021 at 08:45:43PM -0800, Andrii Nakryiko wrote:
> On Mon, Feb 8, 2021 at 7:44 PM Nathan Chancellor <nathan@kernel.org> wrote:
> >
> > 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?
> >
>
> I'll skip the reproduction games this time and will just request the
> vmlinux image. Please upload somewhere so that we can look at DWARF
> and see what's going on. Thanks.
>
Sure thing, let me know if this works. I uploaded in two places to make
it easier to grab:
zstd compressed:
https://github.com/nathanchance/bug-files/blob/3b2873751e29311e084ae2c71604a1963f5e1a48/btf-aarch64/vmlinux.zst
uncompressed:
https://1drv.ms/u/s!AsQNYeB-IEbqjQiUOspbEdXx49o7?e=ipA9Hv
Cheers,
Nathan
next prev parent reply other threads:[~2021-02-09 5:23 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-09 3:44 FAILED unresolved symbol vfs_truncate on arm64 with LLVM Nathan Chancellor
2021-02-09 4:45 ` Andrii Nakryiko
2021-02-09 5:23 ` Nathan Chancellor [this message]
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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