[INFO] cloning repository https://github.com/vkobel/mini_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/vkobel/mini_rust_os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvkobel%2Fmini_rust_os", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvkobel%2Fmini_rust_os'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bdce3bc0f49b9e0848c9ee2bf5234178992c30a7
[INFO] testing vkobel/mini_rust_os against master#b70888601af92f6cdc0364abab3446e418b91d36 for pr-86479
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvkobel%2Fmini_rust_os" "/workspace/builds/worker-11/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/vkobel/mini_rust_os on toolchain b70888601af92f6cdc0364abab3446e418b91d36
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b70888601af92f6cdc0364abab3446e418b91d36" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/vkobel/mini_rust_os
[INFO] finished tweaking git repo https://github.com/vkobel/mini_rust_os
[INFO] tweaked toml for git repo https://github.com/vkobel/mini_rust_os written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/vkobel/mini_rust_os already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+b70888601af92f6cdc0364abab3446e418b91d36" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+b70888601af92f6cdc0364abab3446e418b91d36" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7d16d53275a870b8443d8ff0b0b8634693f83b2e3b9d46c64ae874f0ec756447
[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" "7d16d53275a870b8443d8ff0b0b8634693f83b2e3b9d46c64ae874f0ec756447", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7d16d53275a870b8443d8ff0b0b8634693f83b2e3b9d46c64ae874f0ec756447", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7d16d53275a870b8443d8ff0b0b8634693f83b2e3b9d46c64ae874f0ec756447", kill_on_drop: false }`
[INFO] [stdout] 7d16d53275a870b8443d8ff0b0b8634693f83b2e3b9d46c64ae874f0ec756447
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+b70888601af92f6cdc0364abab3446e418b91d36" "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] 50a733053e8553093cde7dcbc63b2662f72f5ace2628b45eeca46fdaa9e12135
[INFO] running `Command { std: "docker" "start" "-a" "50a733053e8553093cde7dcbc63b2662f72f5ace2628b45eeca46fdaa9e12135", kill_on_drop: false }`
[INFO] [stderr]    Compiling rlibc v0.1.5
[INFO] [stderr]    Compiling mini_rust_os v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0522]: definition of an unknown language item: `panic_fmt`
[INFO] [stdout]   --> src/lib.rs:26:1
[INFO] [stdout]    |
[INFO] [stdout] 26 | #[lang = "panic_fmt"] extern fn panic_fmt() -> ! {loop{}}
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^ definition of unknown language item `panic_fmt`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: `#[panic_handler]` function required, but not found
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0522`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mini_rust_os` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "50a733053e8553093cde7dcbc63b2662f72f5ace2628b45eeca46fdaa9e12135", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "50a733053e8553093cde7dcbc63b2662f72f5ace2628b45eeca46fdaa9e12135", kill_on_drop: false }`
[INFO] [stdout] 50a733053e8553093cde7dcbc63b2662f72f5ace2628b45eeca46fdaa9e12135