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Date: Tue, 28 Oct 2025 15:32:21 -0700
From: Nathan Chancellor <nathan@kernel.org>
To: linaro-toolchain@lists.linaro.org
Cc: llvm@lists.linux.dev
Subject: Re: [Linaro-TCWG-CI] v6.17.3-130-g86f364ee5842: Failure on aarch64
Message-ID: <20251028223221.GA1306180@ax162>
References: <481166937.2108.1761498077256@jenkins.jenkins>
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In-Reply-To: <481166937.2108.1761498077256@jenkins.jenkins>

On Sun, Oct 26, 2025 at 05:01:16PM +0000, ci_notify@linaro.org wrote:
> Dear contributor,
> 
> Our automatic CI has detected problems related to your patch(es). Please find some details below.
> 
> In tcwg_kernel/llvm-master-aarch64-stable-allnoconfig, after:
>   | commit v6.17.3-130-g86f364ee5842
>   | Author: Masahiro Yamada <masahiroy@kernel.org>
>   | Date:   Thu Sep 18 10:05:46 2025 +0200
>   | 
>   |     kbuild: always create intermediate vmlinux.unstripped
>   |     
>   |     [ Upstream commit 0ce5139fd96e9d415d3faaef1c575e238f9bbd67 ]
>   |     
>   |     Generate the intermediate vmlinux.unstripped regardless of
>   | ... 14 lines of the commit log omitted.

This is reproducible for me locally with:

  $ make -skj"$(nproc)" ARCH=arm64 CC=clang CROSS_COMPILE=aarch64-linux-gnu- HOSTCC=clang LD=ld.lld clean allnoconfig all
  aarch64-linux-gnu-objcopy: vmlinux: file format not recognized
  ...

This does not occur with llvm-objcopy via LLVM=1 nor does it happen with
an all GNU setup. This feels like a bug in GNU objcopy though, as this
is reproducible with:

  $ aarch64-linux-gnu-objcopy --set-section-flags .modinfo=noload vmlinux.unstripped vmlinux.objcopy

  $ file vmlinux.unstripped vmlinux.objcopy
  vmlinux.unstripped: ELF 64-bit LSB pie executable, ARM aarch64, version 1 (SYSV), statically linked, BuildID[sha1]=18512f67dae70a7fae145b34514054a8b8b3c105, not stripped
  vmlinux.objcopy:    ELF 64-bit LSB pie executable, ARM aarch64, version 1 (SYSV), statically linked, BuildID[sha1]=18512f67dae70a7fae145b34514054a8b8b3c105, not stripped

  $ aarch64-linux-gnu-objcopy --remove-section=.modinfo -w --strip-unneeded-symbol='__mod_device_table__*' vmlinux.objcopy
  aarch64-linux-gnu-objcopy: vmlinux.objcopy: file format not recognized

  $ aarch64-linux-gnu-objcopy --version | head -1
  GNU objcopy (GNU Binutils) 2.45.50.20251028

Cheers,
Nathan