rustc -o /tmp/testsuite/x86_64-linux-gnu/rust/hello_world/hello_world hello_world.rs
Installing cargo_build v0.1.0 (/usr/share/testsuite/rust/cargo_build)
error: failed to compile `cargo_build v0.1.0 (/usr/share/testsuite/rust/cargo_build)`, intermediate artifacts can be found at `/usr/share/testsuite/rust/cargo_build/target`.
To reuse those artifacts with a future compilation, set the environment variable `CARGO_TARGET_DIR` to that path.
Caused by:
Cross-device link (os error 18)
make[1]: *** [Makefile:7: /tmp/testsuite/x86_64-linux-gnu/rust/cargo_build/cargo_build] Error 101
make: *** [Makefile:48: install-project-rust-cargo_build] Error 2
Sounds like a problem in the sandbox code, which perhaps only arises on the CI setup.
Originally posted by @giordano in https://github.com/JuliaPackaging/BinaryBuilderBase.jl/issues/346#issuecomment-1793431598
Note: this happens only with the non-squashfs images with UserNS runners (not Docker).