[INFO] cloning repository https://github.com/xrs-os/kernel
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/xrs-os/kernel" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxrs-os%2Fkernel", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxrs-os%2Fkernel'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a5440371286589ab8b201dd389ea4653991d123f
[INFO] testing xrs-os/kernel against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fxrs-os%2Fkernel" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/xrs-os/kernel on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-9/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-9/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/xrs-os/kernel
[INFO] finished tweaking git repo https://github.com/xrs-os/kernel
[INFO] tweaked toml for git repo https://github.com/xrs-os/kernel written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/xrs-os/kernel already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 39f138c03881b6299d708518dfa07c8ec54a4cfca38fbea94232e18608e375be
[INFO] running `Command { std: "docker" "start" "-a" "39f138c03881b6299d708518dfa07c8ec54a4cfca38fbea94232e18608e375be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "39f138c03881b6299d708518dfa07c8ec54a4cfca38fbea94232e18608e375be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39f138c03881b6299d708518dfa07c8ec54a4cfca38fbea94232e18608e375be", kill_on_drop: false }`
[INFO] [stdout] 39f138c03881b6299d708518dfa07c8ec54a4cfca38fbea94232e18608e375be
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e55339602fd4696e5adf473a4459e009aef49da6fdea2d08402b45a6c6e42c19
[INFO] running `Command { std: "docker" "start" "-a" "e55339602fd4696e5adf473a4459e009aef49da6fdea2d08402b45a6c6e42c19", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.80
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling libc v0.2.103
[INFO] [stderr]    Compiling crossbeam-queue v0.3.2
[INFO] [stderr]    Compiling futures-task v0.3.17
[INFO] [stderr]    Compiling futures-core v0.3.17
[INFO] [stderr]    Compiling once_cell v1.8.0
[INFO] [stderr]    Compiling bit_field v0.10.1
[INFO] [stderr]    Compiling array-init v2.0.0
[INFO] [stderr]    Compiling pin-project-lite v0.2.7
[INFO] [stderr]    Compiling volatile v0.2.7
[INFO] [stderr]    Compiling zero v0.1.2
[INFO] [stderr]    Compiling num_enum v0.1.0 (/opt/rustwide/workdir/crates/num_enum)
[INFO] [stderr]    Compiling bitmap v0.1.0 (/opt/rustwide/workdir/crates/bitmap)
[INFO] [stderr]    Compiling device_tree v1.0.3 (https://github.com/rcore-os/device_tree-rs#4e8144ba)
[INFO] [stderr]    Compiling volatile v0.4.4
[INFO] [stderr]    Compiling lock_api v0.4.5
[INFO] [stderr]    Compiling ahash v0.7.5
[INFO] [stderr]    Compiling futures-util v0.3.17
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]    Compiling riscv-target v0.1.2
[INFO] [stderr]    Compiling xmas-elf v0.8.0
[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/lock_api-0.4.5/src/lib.rs:93:34
[INFO] [stdout]    |
[INFO] [stdout] 93 | #![cfg_attr(feature = "nightly", feature(const_fn_trait_bound))]
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[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 `lock_api` 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" "e55339602fd4696e5adf473a4459e009aef49da6fdea2d08402b45a6c6e42c19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e55339602fd4696e5adf473a4459e009aef49da6fdea2d08402b45a6c6e42c19", kill_on_drop: false }`
[INFO] [stdout] e55339602fd4696e5adf473a4459e009aef49da6fdea2d08402b45a6c6e42c19