[INFO] cloning repository https://github.com/tumGER/rs_kernel
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tumGER/rs_kernel" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FtumGER%2Frs_kernel", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FtumGER%2Frs_kernel'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 14b5270e715888305499aaeffcaa712b9c4b041c
[INFO] testing tumGER/rs_kernel against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FtumGER%2Frs_kernel" "/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/tumGER/rs_kernel on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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/tumGER/rs_kernel
[INFO] finished tweaking git repo https://github.com/tumGER/rs_kernel
[INFO] tweaked toml for git repo https://github.com/tumGER/rs_kernel written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/tumGER/rs_kernel already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9af5f1c15c092e7c01fe9158a7b5bccdceb5a80635c28f162e5d4950a207b3d3
[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" "9af5f1c15c092e7c01fe9158a7b5bccdceb5a80635c28f162e5d4950a207b3d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9af5f1c15c092e7c01fe9158a7b5bccdceb5a80635c28f162e5d4950a207b3d3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9af5f1c15c092e7c01fe9158a7b5bccdceb5a80635c28f162e5d4950a207b3d3", kill_on_drop: false }`
[INFO] [stdout] 9af5f1c15c092e7c01fe9158a7b5bccdceb5a80635c28f162e5d4950a207b3d3
[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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2b1987dbf8903cb1ff870fb3e5cb6a8cb88e4277a5ace744d1a7008a66dafe0f
[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" "2b1987dbf8903cb1ff870fb3e5cb6a8cb88e4277a5ace744d1a7008a66dafe0f", kill_on_drop: false }`
[INFO] [stderr]    Compiling bootloader v0.9.16
[INFO] [stderr]    Compiling usize_conversions v0.2.0
[INFO] [stderr]    Compiling os_bootinfo v0.2.1
[INFO] [stderr]    Compiling ux v0.1.3
[INFO] [stderr]    Compiling bit_field v0.9.0
[INFO] [stderr]    Compiling volatile v0.2.7
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/usize_conversions-0.2.0/src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(i128_type)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `i128_type` has been stable since 1.26.0 and no longer requires an attribute to enable
[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 E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `usize_conversions` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "2b1987dbf8903cb1ff870fb3e5cb6a8cb88e4277a5ace744d1a7008a66dafe0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b1987dbf8903cb1ff870fb3e5cb6a8cb88e4277a5ace744d1a7008a66dafe0f", kill_on_drop: false }`
[INFO] [stdout] 2b1987dbf8903cb1ff870fb3e5cb6a8cb88e4277a5ace744d1a7008a66dafe0f