[INFO] cloning repository https://github.com/shintard/os
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/shintard/os" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshintard%2Fos", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fshintard%2Fos'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d40c083823a0573c8ec83d0d0db00400463575f1
[INFO] testing shintard/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%2Fshintard%2Fos" "/workspace/builds/worker-17/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-17/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/shintard/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-17/source/.cargo/config
[INFO] started tweaking git repo https://github.com/shintard/os
[INFO] finished tweaking git repo https://github.com/shintard/os
[INFO] tweaked toml for git repo https://github.com/shintard/os written to /workspace/builds/worker-17/source/Cargo.toml
[INFO] crate git repo https://github.com/shintard/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]  Downloading crates ...
[INFO] [stderr]   Downloaded bit_field v0.10.1
[INFO] [stderr]   Downloaded riscv-target v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/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] 9938eec79a523b6ef5a1ff055211087eb458bb07c60312562a95c2edb1335004
[INFO] running `Command { std: "docker" "start" "-a" "9938eec79a523b6ef5a1ff055211087eb458bb07c60312562a95c2edb1335004", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9938eec79a523b6ef5a1ff055211087eb458bb07c60312562a95c2edb1335004", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9938eec79a523b6ef5a1ff055211087eb458bb07c60312562a95c2edb1335004", kill_on_drop: false }`
[INFO] [stdout] 9938eec79a523b6ef5a1ff055211087eb458bb07c60312562a95c2edb1335004
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-17/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] f80dfb31f26040970b978aa5e782e456e5231e7d5eb920c7e3fb73269d8613ee
[INFO] running `Command { std: "docker" "start" "-a" "f80dfb31f26040970b978aa5e782e456e5231e7d5eb920c7e3fb73269d8613ee", kill_on_drop: false }`
[INFO] [stderr]    Compiling bit_field v0.10.1
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]    Compiling riscv-target v0.1.2
[INFO] [stderr]    Compiling riscv v0.6.0 (https://github.com/rcore-os/riscv#21e32ee1)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/git/checkouts/riscv-ab2abd16c438337b/21e32ee/src/lib.rs:17:37
[INFO] [stdout]    |
[INFO] [stdout] 17 | #![cfg_attr(feature = "inline-asm", feature(llvm_asm))]
[INFO] [stdout]    |                                     ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `riscv` due to 2 previous errors
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f80dfb31f26040970b978aa5e782e456e5231e7d5eb920c7e3fb73269d8613ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f80dfb31f26040970b978aa5e782e456e5231e7d5eb920c7e3fb73269d8613ee", kill_on_drop: false }`
[INFO] [stdout] f80dfb31f26040970b978aa5e782e456e5231e7d5eb920c7e3fb73269d8613ee