[INFO] cloning repository https://github.com/brianalexander/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/brianalexander/rust_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrianalexander%2Frust_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrianalexander%2Frust_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c03ec669a2c7c906816b479b73a776dd7c3eba98
[INFO] testing brianalexander/rust_os against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbrianalexander%2Frust_os" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/brianalexander/rust_os on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-4/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/brianalexander/rust_os
[INFO] finished tweaking git repo https://github.com/brianalexander/rust_os
[INFO] tweaked toml for git repo https://github.com/brianalexander/rust_os written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/brianalexander/rust_os already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b5e1e5445540f81f1e883fe52bc4eab79ef129a1e226e3aa44cc6fea14cf5845
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b5e1e5445540f81f1e883fe52bc4eab79ef129a1e226e3aa44cc6fea14cf5845", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b5e1e5445540f81f1e883fe52bc4eab79ef129a1e226e3aa44cc6fea14cf5845", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b5e1e5445540f81f1e883fe52bc4eab79ef129a1e226e3aa44cc6fea14cf5845", kill_on_drop: false }`
[INFO] [stdout] b5e1e5445540f81f1e883fe52bc4eab79ef129a1e226e3aa44cc6fea14cf5845
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9ca252ff059d864da5a80cc1982ffc852b5d4c5e16df903763938b78a1e77ad4
[INFO] running `Command { std: "docker" "start" "-a" "9ca252ff059d864da5a80cc1982ffc852b5d4c5e16df903763938b78a1e77ad4", kill_on_drop: false }`
[INFO] [stderr]    Compiling blog_os v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0428]: the name `_start` is defined multiple times
[INFO] [stdout]   --> src/main.rs:12:1
[INFO] [stdout]    |
[INFO] [stdout] 5  | pub extern "C" fn _start() -> ! {
[INFO] [stdout]    | ------------------------------- previous definition of the value `_start` here
[INFO] [stdout] ...
[INFO] [stdout] 12 | pub extern "C" fn _start() -> ! {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `_start` redefined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `_start` must be defined only once in the value namespace of this module
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0428`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `blog_os` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "9ca252ff059d864da5a80cc1982ffc852b5d4c5e16df903763938b78a1e77ad4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ca252ff059d864da5a80cc1982ffc852b5d4c5e16df903763938b78a1e77ad4", kill_on_drop: false }`
[INFO] [stdout] 9ca252ff059d864da5a80cc1982ffc852b5d4c5e16df903763938b78a1e77ad4