为何arm32v7 Docker镜像中rustc二进制存在却无法执行？

背景 #

基于arm32v7/python:3.11.5-slim-bullseye构建Docker镜像，因安装cryptography无预编译wheel需编译，故通过rustup安装Rust。

Dockerfile片段 #

# Install Rust with the install script
RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
# Update path to include all Rust-related binaries
ENV PATH="/root/.cargo/bin:${PATH}"

RUN ls /root/.cargo/bin

RUN /root/.cargo/bin/rustup --version
RUN rustup --version

RUN /root/.cargo/bin/rustc --version
RUN rustc --version

执行现象 #

1. ls命令确认二进制存在：

#9 [ 5/14] RUN ls /root/.cargo/bin
#9 0.441 cargo
#9 0.441 cargo-clippy
#9 0.441 cargo-fmt
#9 0.441 cargo-miri
#9 0.441 clippy-driver
#9 0.441 rls
#9 0.441 rust-analyzer
#9 0.441 rust-gdb
#9 0.441 rust-gdbgui
#9 0.441 rust-lldb
#9 0.441 rustc
#9 0.441 rustdoc
#9 0.441 rustfmt
#9 0.441 rustup
#9 DONE 1.1s

2. rustup --version执行异常：

#10 [ 6/14] RUN /root/.cargo/bin/rustup --version
#10 0.584 rustup 1.26.0 (5af9b9484 2023-04-05)
#10 0.584 info: This is the version for the rustup toolchain manager, not the rustc compiler.
#10 0.685 info: The currently active `rustc` version is `(error reading rustc version)`
#10 DONE 1.2s

3. rustc无法执行，即使指定绝对路径：

#12 [ 8/14] RUN /root/.cargo/bin/rustc --version
#12 0.615 error: command failed: 'rustc': No such file or directory (os error 2)
#12 ERROR: process "/bin/sh -c /root/.cargo/bin/rustc --version" did not complete successfully: exit code: 1

已尝试的解决方法 #

• 用rustup run stable rustc -- --version执行，仍报相同的os error 2
• 将rustc复制到其他路径执行，复制成功但仍无法运行
• 对/root/.cargo/bin/rustc执行ldd，确认所有共享库存在
• 用ls -l确认二进制不是符号链接：

#9 [ 5/15] RUN ls -l /root/.cargo/bin
#9 0.482 total 182840
#9 0.482 -rwxr-xr-x 14 root root 13370420 Sep 23 15:44 cargo
#9 0.482 -rwxr-xr-x 14 root root 13370420 Sep 23 15:44 cargo-clippy
#9 0.482 -rwxr-xr-x 14 root root 13370420 Sep 23 15:44 cargo-fmt
#9 0.482 -rwxr-xr-x 14 root root 13370420 Sep 23 15:44 cargo-miri
#9 0.482 -rwxr-xr-x 14 root root 13370420 Sep 23 15:44 clippy-driver
#9 0.482 -rwxr-xr-x 14 root root 13370420 Sep 23 15:44 rls
#9 0.482 -rwxr-xr-x 14 root root 13370420 Sep 23 15:44 rust-analyzer
#9 0.482 -rwxr-xr-x 14 root root 13370420 Sep 23 15:44 rust-gdb
#9 0.482 -rwxr-xr-x 14 root root 13370420 Sep 23 15:44 rust-gdbgui
#9 0.482 -rwxr-xr-x 14 root root 13370420 Sep 23 15:44 rust-lldb
#9 0.482 -rwxr-xr-x 14 root root 13370420 Sep 23 15:44 rustc
#9 0.482 -rwxr-xr-x 14 root root 13370420 Sep 23 15:44 rustdoc
#9 0.482 -rwxr-xr-x 14 root root 13370420 Sep 23 15:44 rustfmt
#9 0.482 -rwxr-xr-x 14 root root 13370420 Sep 23 15:44 rustup

• 通过rustup安装不同版本工具链，无任何变化

期望 #

rustc二进制文件能正常被找到并执行。

内容的提问来源于stack exchange，提问作者user22400056