[INFO] cloning repository https://github.com/AleVul/kernel_playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AleVul/kernel_playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAleVul%2Fkernel_playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAleVul%2Fkernel_playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 5634f9ab05787000155321b4e865d5e21db1fff7
[INFO] documenting AleVul/kernel_playground against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAleVul%2Fkernel_playground" "/workspace/builds/worker-0/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/AleVul/kernel_playground on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-0/source/.cargo/config
[INFO] removed /workspace/builds/worker-0/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/AleVul/kernel_playground
[INFO] removed 0 missing tests
[INFO] finished tweaking git repo https://github.com/AleVul/kernel_playground
[INFO] tweaked toml for git repo https://github.com/AleVul/kernel_playground written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/AleVul/kernel_playground already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0f19ceed3c5a6bda157ae105385d862f6086c595d315a3b6575e2a23855d1098
[INFO] running `Command { std: "docker" "start" "-a" "0f19ceed3c5a6bda157ae105385d862f6086c595d315a3b6575e2a23855d1098", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0f19ceed3c5a6bda157ae105385d862f6086c595d315a3b6575e2a23855d1098", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f19ceed3c5a6bda157ae105385d862f6086c595d315a3b6575e2a23855d1098", kill_on_drop: false }`
[INFO] [stdout] 0f19ceed3c5a6bda157ae105385d862f6086c595d315a3b6575e2a23855d1098
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9482d796bb678bdb5812887715e0d032d93d809b5cd97948d69219dec0f93f68
[INFO] running `Command { std: "docker" "start" "-a" "9482d796bb678bdb5812887715e0d032d93d809b5cd97948d69219dec0f93f68", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]     Checking nodrop v0.1.13
[INFO] [stderr]    Compiling cc v1.0.38
[INFO] [stderr]     Checking ux v0.1.3
[INFO] [stderr]     Checking cast v0.2.2
[INFO] [stderr]     Checking bit_field v0.9.0
[INFO] [stderr]    Compiling llvm-tools v0.1.1
[INFO] [stderr]     Checking zero v0.1.2
[INFO] [stderr]     Checking fixedvec v0.2.4
[INFO] [stderr]     Checking spin v0.5.1
[INFO] [stderr]     Checking usize_conversions v0.2.0
[INFO] [stderr]     Checking volatile v0.2.6
[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/usize_conversions-0.2.0/src/lib.rs:6:1
[INFO] [stdout]   |
[INFO] [stdout] 6 | #![feature(i128_type)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `i128_type` has been stable since 1.26.0 and no longer requires an attribute to enable
[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 `usize_conversions`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9482d796bb678bdb5812887715e0d032d93d809b5cd97948d69219dec0f93f68", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9482d796bb678bdb5812887715e0d032d93d809b5cd97948d69219dec0f93f68", kill_on_drop: false }`
[INFO] [stdout] 9482d796bb678bdb5812887715e0d032d93d809b5cd97948d69219dec0f93f68
