[INFO] cloning repository https://github.com/trusch/snakeos
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/trusch/snakeos" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftrusch%2Fsnakeos", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftrusch%2Fsnakeos'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 46e27f0b8a7b37424d847682d4a0d0473b7b2215
[INFO] testing trusch/snakeos against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftrusch%2Fsnakeos" "/workspace/builds/worker-13/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/trusch/snakeos on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-13/source/.cargo/config.toml
[INFO] started tweaking git repo https://github.com/trusch/snakeos
[INFO] finished tweaking git repo https://github.com/trusch/snakeos
[INFO] tweaked toml for git repo https://github.com/trusch/snakeos written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/trusch/snakeos already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pic8259 v0.10.1
[INFO] [stderr]   Downloaded locate-cargo-manifest v0.2.2
[INFO] [stderr]   Downloaded bootloader-locator v0.0.4
[INFO] [stderr]   Downloaded bootloader v0.10.7
[INFO] [stderr]   Downloaded linked_list_allocator v0.9.0
[INFO] [stderr]   Downloaded font8x8 v0.2.7
[INFO] [stderr]   Downloaded x86_64 v0.14.4
[INFO] [stderr]   Downloaded uart_16550 v0.2.15
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f8441c58e95b00657f17be3cb6e58620caea75edcc394c1c1d838263f5617ec8
[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" "f8441c58e95b00657f17be3cb6e58620caea75edcc394c1c1d838263f5617ec8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f8441c58e95b00657f17be3cb6e58620caea75edcc394c1c1d838263f5617ec8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f8441c58e95b00657f17be3cb6e58620caea75edcc394c1c1d838263f5617ec8", kill_on_drop: false }`
[INFO] [stdout] f8441c58e95b00657f17be3cb6e58620caea75edcc394c1c1d838263f5617ec8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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:eaef2f80f755933c374d2ae5edccceec0c1312ceb8a4e0b6404e8ab76561e1e5" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "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] ec84630f5080ac8d4bc9b6098c267ebb083eb38939cf8ba95c0554c288bdb5ef
[INFO] running `Command { std: "docker" "start" "-a" "ec84630f5080ac8d4bc9b6098c267ebb083eb38939cf8ba95c0554c288bdb5ef", kill_on_drop: false }`
[INFO] [stderr]    Compiling x86_64 v0.14.4
[INFO] [stderr]    Compiling bit_field v0.9.0
[INFO] [stderr]    Compiling futures-core v0.3.16
[INFO] [stderr]    Compiling futures-task v0.3.16
[INFO] [stderr]    Compiling volatile v0.4.4
[INFO] [stderr]    Compiling bootloader v0.10.7
[INFO] [stderr]    Compiling conquer-util v0.2.0
[INFO] [stderr]    Compiling spin v0.5.2
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling volatile v0.2.7
[INFO] [stderr]    Compiling pc-keyboard v0.5.1
[INFO] [stderr]    Compiling font8x8 v0.2.7
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling futures-util v0.3.16
[INFO] [stderr]    Compiling lock_api v0.4.4
[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] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling conquer-once v0.2.1
[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" "ec84630f5080ac8d4bc9b6098c267ebb083eb38939cf8ba95c0554c288bdb5ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec84630f5080ac8d4bc9b6098c267ebb083eb38939cf8ba95c0554c288bdb5ef", kill_on_drop: false }`
[INFO] [stdout] ec84630f5080ac8d4bc9b6098c267ebb083eb38939cf8ba95c0554c288bdb5ef