[INFO] cloning repository https://github.com/lucis-fluxum/os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/lucis-fluxum/os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flucis-fluxum%2Fos", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flucis-fluxum%2Fos'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b1558469a256b377e4a4132bc2c4d3d35931b5a1
[INFO] testing lucis-fluxum/os against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Flucis-fluxum%2Fos" "/workspace/builds/worker-64/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-64/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lucis-fluxum/os 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-64/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-64/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/lucis-fluxum/os
[INFO] removed 0 missing tests
[INFO] finished tweaking git repo https://github.com/lucis-fluxum/os
[INFO] tweaked toml for git repo https://github.com/lucis-fluxum/os written to /workspace/builds/worker-64/source/Cargo.toml
[INFO] crate git repo https://github.com/lucis-fluxum/os 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 volatile v0.4.4
[INFO] [stderr]   Downloaded spinning_top v0.2.4
[INFO] [stderr]   Downloaded linked_list_allocator v0.9.0
[INFO] [stderr]   Downloaded conquer-util v0.3.0
[INFO] [stderr]   Downloaded conquer-once v0.3.2
[INFO] [stderr]   Downloaded pc-keyboard v0.5.1
[INFO] [stderr]   Downloaded pic8259 v0.10.1
[INFO] [stderr]   Downloaded uart_16550 v0.2.15
[INFO] [stderr]   Downloaded x86_64 v0.14.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-64/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-64/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] 773eeba38f3652b0a32d373b2d5b6a32bc8db60fd31da10a0efc6d789bb60d1d
[INFO] running `Command { std: "docker" "start" "-a" "773eeba38f3652b0a32d373b2d5b6a32bc8db60fd31da10a0efc6d789bb60d1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "773eeba38f3652b0a32d373b2d5b6a32bc8db60fd31da10a0efc6d789bb60d1d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "773eeba38f3652b0a32d373b2d5b6a32bc8db60fd31da10a0efc6d789bb60d1d", kill_on_drop: false }`
[INFO] [stdout] 773eeba38f3652b0a32d373b2d5b6a32bc8db60fd31da10a0efc6d789bb60d1d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-64/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-64/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] 8c0d46e09e07d29df993757cb39f94bcc8bc8971c35e29df814b65fc36f5e8d4
[INFO] running `Command { std: "docker" "start" "-a" "8c0d46e09e07d29df993757cb39f94bcc8bc8971c35e29df814b65fc36f5e8d4", kill_on_drop: false }`
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling x86_64 v0.14.3
[INFO] [stderr]    Compiling volatile v0.4.4
[INFO] [stderr]    Compiling bit_field v0.9.0
[INFO] [stderr]    Compiling cfg-if v1.0.0
[INFO] [stderr]    Compiling futures-core v0.3.15
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling futures-task v0.3.15
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling bootloader v0.9.18
[INFO] [stderr]    Compiling crossbeam-queue v0.3.2
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling conquer-util v0.3.0
[INFO] [stderr]    Compiling pin-project-lite v0.2.7
[INFO] [stderr]    Compiling pc-keyboard v0.5.1
[INFO] [stderr]    Compiling volatile v0.3.0
[INFO] [stderr]    Compiling tinypci v0.1.0 (https://github.com/trashbyte/tinypci#f1afba83)
[INFO] [stderr]    Compiling futures-util v0.3.15
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/git/checkouts/tinypci-9831d3a001cc0dab/f1afba8/src/lib.rs:7:1
[INFO] [stdout]   |
[INFO] [stdout] 7 | #![feature(llvm_asm)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling lock_api v0.4.4
[INFO] [stderr]    Compiling conquer-once v0.3.2
[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 `tinypci` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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-0.4.4/src/lib.rs:91:34
[INFO] [stdout]    |
[INFO] [stdout] 91 | #![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: build failed
[INFO] running `Command { std: "docker" "inspect" "8c0d46e09e07d29df993757cb39f94bcc8bc8971c35e29df814b65fc36f5e8d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8c0d46e09e07d29df993757cb39f94bcc8bc8971c35e29df814b65fc36f5e8d4", kill_on_drop: false }`
[INFO] [stdout] 8c0d46e09e07d29df993757cb39f94bcc8bc8971c35e29df814b65fc36f5e8d4