[INFO] fetching crate cobalt_os 0.1.1...
[INFO] checking cobalt_os-0.1.1 against 1.55.0 for beta-1.56-3
[INFO] extracting crate cobalt_os 0.1.1 into /workspace/builds/worker-25/source
[INFO] validating manifest of crates.io crate cobalt_os 0.1.1 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-25/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-25/source/rust-toolchain
[INFO] started tweaking crates.io crate cobalt_os 0.1.1
[INFO] finished tweaking crates.io crate cobalt_os 0.1.1
[INFO] tweaked toml for crates.io crate cobalt_os 0.1.1 written to /workspace/builds/worker-25/source/Cargo.toml
[INFO] crate crates.io crate cobalt_os 0.1.1 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rsdp v2.0.0
[INFO] [stderr]   Downloaded pc-keyboard v0.5.1
[INFO] [stderr]   Downloaded bootloader v0.9.19
[INFO] [stderr]   Downloaded acpi v4.0.0
[INFO] [stderr]   Downloaded pic8259 v0.10.2
[INFO] [stderr]   Downloaded volatile v0.2.7
[INFO] [stderr]   Downloaded linked_list_allocator v0.9.0
[INFO] [stderr]   Downloaded managed v0.7.2
[INFO] [stderr]   Downloaded smoltcp v0.7.5
[INFO] [stderr]   Downloaded array-macro v2.1.0
[INFO] [stderr]   Downloaded aml v0.16.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-25/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-25/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] 269130bffeb8645de8c11672052ff2d83243756e5330ee2493dc69e3b1dee009
[INFO] running `Command { std: "docker" "start" "-a" "269130bffeb8645de8c11672052ff2d83243756e5330ee2493dc69e3b1dee009", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "269130bffeb8645de8c11672052ff2d83243756e5330ee2493dc69e3b1dee009", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "269130bffeb8645de8c11672052ff2d83243756e5330ee2493dc69e3b1dee009", kill_on_drop: false }`
[INFO] [stdout] 269130bffeb8645de8c11672052ff2d83243756e5330ee2493dc69e3b1dee009
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-25/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-25/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" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6da4c495074679f9398e052d5a7f9e2836cf7bdaf568bf6c736a81514af66374
[INFO] running `Command { std: "docker" "start" "-a" "6da4c495074679f9398e052d5a7f9e2836cf7bdaf568bf6c736a81514af66374", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking bit_field v0.10.1
[INFO] [stderr]    Compiling radium v0.6.2
[INFO] [stderr]    Compiling x86_64 v0.14.6
[INFO] [stderr]     Checking volatile v0.4.4
[INFO] [stderr]     Checking tap v1.0.1
[INFO] [stderr]    Compiling serde v1.0.130
[INFO] [stderr]    Compiling bootloader v0.9.19
[INFO] [stderr]     Checking funty v1.2.0
[INFO] [stderr]     Checking managed v0.7.2
[INFO] [stderr]     Checking spin v0.5.2
[INFO] [stderr]     Checking bytes v1.1.0
[INFO] [stderr]     Checking array-macro v2.1.0
[INFO] [stderr]     Checking volatile v0.2.7
[INFO] [stderr]     Checking pc-keyboard v0.5.1
[INFO] [stderr]     Checking lock_api v0.4.5
[INFO] [stderr]     Checking rsdp v2.0.0
[INFO] [stderr]    Compiling syn v1.0.80
[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/managed-0.7.2/src/lib.rs:2:59
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![cfg_attr(all(feature = "alloc", not(feature = "std")), feature(alloc))]
[INFO] [stdout]   |                                                           ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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]     Checking wyz v0.4.0
[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] error: could not compile `managed` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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: build failed
[INFO] running `Command { std: "docker" "inspect" "6da4c495074679f9398e052d5a7f9e2836cf7bdaf568bf6c736a81514af66374", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6da4c495074679f9398e052d5a7f9e2836cf7bdaf568bf6c736a81514af66374", kill_on_drop: false }`
[INFO] [stdout] 6da4c495074679f9398e052d5a7f9e2836cf7bdaf568bf6c736a81514af66374
