rustup linux rustc executable not executable (symbol lookup error)

[matthiaskrgr]

since 246f66a / #99062 the linux rustc executables distributed by rustup are no longer executable:

rustup-toolchain-installer-master 246f66a905c2815f2c9b9c3d6b1e0649f3360ef8
~/.rustup/toolchains/246f66a905c2815f2c9b9c3d6b1e0649f3360ef8/bin/rustc  --version

/home/matthias/.rustup/toolchains/246f66a905c2815f2c9b9c3d6b1e0649f3360ef8/bin/rustc: symbol lookup error: /home/matthias/.rustup/toolchains/246f66a905c2815f2c9b9c3d6b1e0649f3360ef8/bin/rustc: undefined symbol: _ZN3std2rt19lang_start_internal17h614c83dc44962c80E

The toolchain before that merge (263edd4 ) works fine for me.

My target (is that the right term for it?) is x86_64-unknown-linux-gnu

[Mark-Simulacrum]

I think it would be good to get the dynamic linker version, since perf (which also uses Linux) didn't run into this...

[workingjubilee]

@matthiaskrgr If this is your "default" nightly toolchain that you tried to upgrade and it borked, then it is considered the host toolchain by rustup.

[matthiaskrgr]

@workingjubilee this toolchain was installed via rustup-toolchain-install-master -f -n master -c rustc-dev llvm-tools rust-src clippy rust-analyzer rustfmt to be precise this is (not yet..) the master toolchain, but will be in a few hours.

Executing different rustcs by path directly like ~/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/bin/rustc has always worked regardless of rustup until now.

[jyn514]

cc @Kobzol

[jyn514]

I think we should revert that PR until we figure out why this is broken.

[Kobzol]

Heh, that was fast :D I expected obscure errors, but outright failing to execute rustc... well, that's bad.

Filed #99442

[workingjubilee]

So the obvious question is:
How was this not caught in CI?

[jyn514]

@workingjubilee it seems to not happen on every platform, CI obviously ran the tests successfully and @cuviper tested in a bunch of platforms with old glibc versions / toolchains and it worked on those too.

[workingjubilee]

@matthiaskrgr May we see uname -srm && echo "---" && ld --version && echo "---" && ldd --version?