[INFO] cloning repository https://github.com/JohnDowson/ost
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JohnDowson/ost" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJohnDowson%2Fost", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJohnDowson%2Fost'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4a9697260e630186f1427c2338bc137e6f44876c
[INFO] checking JohnDowson/ost against beta for pr-78714
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJohnDowson%2Fost" "/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/JohnDowson/ost on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-0/source/.cargo/config
[INFO] started tweaking git repo https://github.com/JohnDowson/ost
[INFO] finished tweaking git repo https://github.com/JohnDowson/ost
[INFO] tweaked toml for git repo https://github.com/JohnDowson/ost written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/JohnDowson/ost already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: build
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e3c4ba095835a1b25e7b25c4959e4a6741a7eaecb3f4896b6356f0a936b8fedf
[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" "e3c4ba095835a1b25e7b25c4959e4a6741a7eaecb3f4896b6356f0a936b8fedf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e3c4ba095835a1b25e7b25c4959e4a6741a7eaecb3f4896b6356f0a936b8fedf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e3c4ba095835a1b25e7b25c4959e4a6741a7eaecb3f4896b6356f0a936b8fedf", kill_on_drop: false }`
[INFO] [stdout] e3c4ba095835a1b25e7b25c4959e4a6741a7eaecb3f4896b6356f0a936b8fedf
[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" "RUSTFLAGS=--cap-lints=forbid" "-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" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4df7f7fa5f4ece16d3c6a60f378fd60d9a5e08332bb7dbd8d5e5747d6a3921c5
[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" "4df7f7fa5f4ece16d3c6a60f378fd60d9a5e08332bb7dbd8d5e5747d6a3921c5", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: build
[INFO] [stderr]    Compiling x86_64 v0.11.1
[INFO] [stderr]    Compiling bootloader v0.9.4
[INFO] [stderr]     Checking cpuio v0.3.0
[INFO] [stderr]     Checking pc-keyboard v0.5.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/cpuio-0.3.0/src/lib.rs:4:1
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(llvm_asm, const_fn)]
[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 `cpuio`
[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" "4df7f7fa5f4ece16d3c6a60f378fd60d9a5e08332bb7dbd8d5e5747d6a3921c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4df7f7fa5f4ece16d3c6a60f378fd60d9a5e08332bb7dbd8d5e5747d6a3921c5", kill_on_drop: false }`
[INFO] [stdout] 4df7f7fa5f4ece16d3c6a60f378fd60d9a5e08332bb7dbd8d5e5747d6a3921c5