[INFO] cloning repository https://github.com/bruskajp/rust_os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bruskajp/rust_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbruskajp%2Frust_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbruskajp%2Frust_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0ca2f0cc69511a54b01f1fb7eef58dccb45aec48
[INFO] testing bruskajp/rust_os against master#99e3aef02079e9c10583638520cd0c134dc3a01d for pr-85530
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbruskajp%2Frust_os" "/workspace/builds/worker-10/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bruskajp/rust_os on toolchain 99e3aef02079e9c10583638520cd0c134dc3a01d
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-10/source/.cargo/config
[INFO] started tweaking git repo https://github.com/bruskajp/rust_os
[INFO] finished tweaking git repo https://github.com/bruskajp/rust_os
[INFO] tweaked toml for git repo https://github.com/bruskajp/rust_os written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/bruskajp/rust_os already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ff39fb8474ca0d79f078aa0af806d7a8135600c0a0ffd536ae3eaaa15df70455
[INFO] running `Command { std: "docker" "start" "-a" "ff39fb8474ca0d79f078aa0af806d7a8135600c0a0ffd536ae3eaaa15df70455", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ff39fb8474ca0d79f078aa0af806d7a8135600c0a0ffd536ae3eaaa15df70455", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff39fb8474ca0d79f078aa0af806d7a8135600c0a0ffd536ae3eaaa15df70455", kill_on_drop: false }`
[INFO] [stdout] ff39fb8474ca0d79f078aa0af806d7a8135600c0a0ffd536ae3eaaa15df70455
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+99e3aef02079e9c10583638520cd0c134dc3a01d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a19f0315a7c02179d41d7102ea82b93210319a43fd8bf4b622b19592e4ff3f92
[INFO] running `Command { std: "docker" "start" "-a" "a19f0315a7c02179d41d7102ea82b93210319a43fd8bf4b622b19592e4ff3f92", kill_on_drop: false }`
[INFO] [stderr]    Compiling bootloader v0.8.3
[INFO] [stderr]    Compiling volatile v0.2.6
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling rust_os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: language item required, but not found: `eh_personality`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/main.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 23 |     panic!("Some panic message");
[INFO] [stdout]    |     ----------------------------- any code following this expression is unreachable
[INFO] [stdout] 24 | 
[INFO] [stdout] 25 |     loop {}
[INFO] [stdout]    |     ^^^^^^^ unreachable expression
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_os`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "a19f0315a7c02179d41d7102ea82b93210319a43fd8bf4b622b19592e4ff3f92", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a19f0315a7c02179d41d7102ea82b93210319a43fd8bf4b622b19592e4ff3f92", kill_on_drop: false }`
[INFO] [stdout] a19f0315a7c02179d41d7102ea82b93210319a43fd8bf4b622b19592e4ff3f92