[INFO] fetching crate printk 0.2.5...
[INFO] documenting printk-0.2.5 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate printk 0.2.5 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate printk 0.2.5 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate printk 0.2.5
[INFO] finished tweaking crates.io crate printk 0.2.5
[INFO] tweaked toml for crates.io crate printk 0.2.5 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded conquer-once v0.3.2
[INFO] [stderr]   Downloaded bootloader v0.10.12
[INFO] [stderr]   Downloaded conquer-util v0.3.0
[INFO] [stderr]   Downloaded noto-sans-mono-bitmap v0.1.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "metadata" "--no-deps" "--format-version=1", 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] c76ab90759277d761e3fb14eb4481a030dc1d74ddcfe8d134a8ecb7082ea8ae3
[INFO] running `Command { std: "docker" "start" "-a" "c76ab90759277d761e3fb14eb4481a030dc1d74ddcfe8d134a8ecb7082ea8ae3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c76ab90759277d761e3fb14eb4481a030dc1d74ddcfe8d134a8ecb7082ea8ae3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c76ab90759277d761e3fb14eb4481a030dc1d74ddcfe8d134a8ecb7082ea8ae3", kill_on_drop: false }`
[INFO] [stdout] c76ab90759277d761e3fb14eb4481a030dc1d74ddcfe8d134a8ecb7082ea8ae3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ba2b56d24fade479cd6af5e311a13d3cae2905461c6e7a308c6f55acc9cbae22
[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" "ba2b56d24fade479cd6af5e311a13d3cae2905461c6e7a308c6f55acc9cbae22", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]    Compiling bootloader v0.10.12
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking conquer-util v0.3.0
[INFO] [stderr]     Checking noto-sans-mono-bitmap v0.1.5
[INFO] [stderr]     Checking conquer-once v0.3.2
[INFO] [stderr]    Compiling lock_api v0.4.7
[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/bootloader-0.10.12/src/lib.rs:69:12
[INFO] [stdout]    |
[INFO] [stdout] 69 | #![feature(maybe_uninit_slice)]
[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 `bootloader` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `noto-sans-mono-bitmap`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name noto_sans_mono_bitmap --edition=2018 /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/noto-sans-mono-bitmap-0.1.5/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type lib --emit=dep-info,metadata -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="all"' --cfg 'feature="bold"' --cfg 'feature="default"' --cfg 'feature="light"' --cfg 'feature="regular"' --cfg 'feature="size_14"' --cfg 'feature="size_16"' --cfg 'feature="size_18"' --cfg 'feature="size_20"' --cfg 'feature="size_22"' --cfg 'feature="size_24"' --cfg 'feature="size_32"' --cfg 'feature="size_64"' -C metadata=aab73284660c347f -C extra-filename=-aab73284660c347f --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --cap-lints allow` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "ba2b56d24fade479cd6af5e311a13d3cae2905461c6e7a308c6f55acc9cbae22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba2b56d24fade479cd6af5e311a13d3cae2905461c6e7a308c6f55acc9cbae22", kill_on_drop: false }`
[INFO] [stdout] ba2b56d24fade479cd6af5e311a13d3cae2905461c6e7a308c6f55acc9cbae22