[INFO] fetching crate libertyos_kernel 0.15.7...
[INFO] testing libertyos_kernel-0.15.7 against 1.59.0 for beta-1.60-1
[INFO] extracting crate libertyos_kernel 0.15.7 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate libertyos_kernel 0.15.7 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-10/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-10/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate libertyos_kernel 0.15.7
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate libertyos_kernel 0.15.7
[INFO] tweaked toml for crates.io crate libertyos_kernel 0.15.7 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate crates.io crate libertyos_kernel 0.15.7 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] 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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e8433b60a9bdec3c898800553a48e51d630e75d2b2c3c6096b32d7be772f624e
[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" "e8433b60a9bdec3c898800553a48e51d630e75d2b2c3c6096b32d7be772f624e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e8433b60a9bdec3c898800553a48e51d630e75d2b2c3c6096b32d7be772f624e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e8433b60a9bdec3c898800553a48e51d630e75d2b2c3c6096b32d7be772f624e", kill_on_drop: false }`
[INFO] [stdout] e8433b60a9bdec3c898800553a48e51d630e75d2b2c3c6096b32d7be772f624e
[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=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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ce846536b8607841f3d8ed252c27b59ce9e7eca14b56182bcdb44f72e2c8afc9
[INFO] running `Command { std: "docker" "start" "-a" "ce846536b8607841f3d8ed252c27b59ce9e7eca14b56182bcdb44f72e2c8afc9", kill_on_drop: false }`
[INFO] [stderr]    Compiling bit_field v0.10.1
[INFO] [stderr]    Compiling x86_64 v0.14.7
[INFO] [stderr]    Compiling radium v0.6.2
[INFO] [stderr]    Compiling futures-core v0.3.19
[INFO] [stderr]    Compiling futures-task v0.3.19
[INFO] [stderr]    Compiling volatile v0.4.4
[INFO] [stderr]    Compiling micromath v1.1.1
[INFO] [stderr]    Compiling bootloader v0.9.21
[INFO] [stderr]    Compiling conquer-util v0.3.0
[INFO] [stderr]    Compiling funty v1.2.0
[INFO] [stderr]    Compiling serde v1.0.133
[INFO] [stderr]    Compiling futures-util v0.3.19
[INFO] [stderr]    Compiling font8x8 v0.3.1
[INFO] [stderr]    Compiling block_device v0.1.2
[INFO] [stderr]    Compiling conquer-util v0.2.0
[INFO] [stderr]    Compiling pc-keyboard v0.5.1
[INFO] [stderr]    Compiling volatile v0.2.7
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling lock_api v0.4.5
[INFO] [stderr]    Compiling wyz v0.4.0
[INFO] [stderr]    Compiling raw-cpuid v10.2.0
[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/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] [stderr]    Compiling rand v0.8.4
[INFO] [stderr]    Compiling fat32 v0.2.0
[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]    Compiling conquer-once v0.3.2
[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" "ce846536b8607841f3d8ed252c27b59ce9e7eca14b56182bcdb44f72e2c8afc9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce846536b8607841f3d8ed252c27b59ce9e7eca14b56182bcdb44f72e2c8afc9", kill_on_drop: false }`
[INFO] [stdout] ce846536b8607841f3d8ed252c27b59ce9e7eca14b56182bcdb44f72e2c8afc9