[INFO] cloning repository https://github.com/CairBin/RustOs-x86
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/CairBin/RustOs-x86" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCairBin%2FRustOs-x86", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCairBin%2FRustOs-x86'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 38889bcf7c20af452316ad34059d4ee19941851c
[INFO] testing CairBin/RustOs-x86 against 1.75.0 for beta-1.76-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCairBin%2FRustOs-x86" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/CairBin/RustOs-x86 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-3-tc1/source/.cargo/config.toml
[INFO] removed /workspace/builds/worker-3-tc1/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/CairBin/RustOs-x86
[INFO] removed 0 missing tests
[INFO] finished tweaking git repo https://github.com/CairBin/RustOs-x86
[INFO] tweaked toml for git repo https://github.com/CairBin/RustOs-x86 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/CairBin/RustOs-x86 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded volatile v0.2.7
[INFO] [stderr]   Downloaded pc-keyboard v0.5.1
[INFO] [stderr]   Downloaded linked_list_allocator v0.9.1
[INFO] [stderr]   Downloaded x86_64 v0.14.10
[INFO] [stderr]   Downloaded pic8259 v0.10.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 492f67e2a83275f26a888b21efd360eb45bdc3de93ead4fc37535e4a3dd99eb8
[INFO] running `Command { std: "docker" "start" "-a" "492f67e2a83275f26a888b21efd360eb45bdc3de93ead4fc37535e4a3dd99eb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "492f67e2a83275f26a888b21efd360eb45bdc3de93ead4fc37535e4a3dd99eb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "492f67e2a83275f26a888b21efd360eb45bdc3de93ead4fc37535e4a3dd99eb8", kill_on_drop: false }`
[INFO] [stdout] 492f67e2a83275f26a888b21efd360eb45bdc3de93ead4fc37535e4a3dd99eb8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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" "RUSTDOCFLAGS=--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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d1e266a78dcc2a1536d94a67d4b692298a8aa25843c747599a4c1276f083e3e6
[INFO] running `Command { std: "docker" "start" "-a" "d1e266a78dcc2a1536d94a67d4b692298a8aa25843c747599a4c1276f083e3e6", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustversion v1.0.14
[INFO] [stderr]    Compiling lock_api v0.4.10
[INFO] [stderr]    Compiling volatile v0.4.6
[INFO] [stderr]    Compiling bit_field v0.10.2
[INFO] [stderr]    Compiling bootloader v0.9.23
[INFO] [stderr]    Compiling spin v0.5.2
[INFO] [stderr]    Compiling pc-keyboard v0.5.1
[INFO] [stderr]    Compiling volatile v0.2.7
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling spinning_top v0.2.5
[INFO] [stderr]    Compiling linked_list_allocator v0.9.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/linked_list_allocator-0.9.1/src/lib.rs:1:41
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "const_mut_refs", feature(const_mut_refs))]
[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 `linked_list_allocator` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "d1e266a78dcc2a1536d94a67d4b692298a8aa25843c747599a4c1276f083e3e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d1e266a78dcc2a1536d94a67d4b692298a8aa25843c747599a4c1276f083e3e6", kill_on_drop: false }`
[INFO] [stdout] d1e266a78dcc2a1536d94a67d4b692298a8aa25843c747599a4c1276f083e3e6
