[INFO] fetching crate futures_ringbuf 0.3.0...
[INFO] checking futures_ringbuf-0.3.0 against beta for pr-78714
[INFO] extracting crate futures_ringbuf 0.3.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate futures_ringbuf 0.3.0 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate futures_ringbuf 0.3.0
[INFO] finished tweaking crates.io crate futures_ringbuf 0.3.0
[INFO] tweaked toml for crates.io crate futures_ringbuf 0.3.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate futures_ringbuf 0.3.0 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ca79310a1b997819aa9d43f5928f8b075656f25ce3982e5b7c20ca974f4bb38a
[INFO] running `Command { std: "docker" "start" "-a" "ca79310a1b997819aa9d43f5928f8b075656f25ce3982e5b7c20ca974f4bb38a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ca79310a1b997819aa9d43f5928f8b075656f25ce3982e5b7c20ca974f4bb38a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca79310a1b997819aa9d43f5928f8b075656f25ce3982e5b7c20ca974f4bb38a", kill_on_drop: false }`
[INFO] [stdout] ca79310a1b997819aa9d43f5928f8b075656f25ce3982e5b7c20ca974f4bb38a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 09203b455072cb16d5ad7ccd51a85a34d11f953ccda3c309fb3e2445a50d2f1f
[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" "09203b455072cb16d5ad7ccd51a85a34d11f953ccda3c309fb3e2445a50d2f1f", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-core v0.3.7
[INFO] [stderr]     Checking futures-io v0.3.7
[INFO] [stderr]     Checking futures-sink v0.3.7
[INFO] [stderr]     Checking ringbuf v0.2.2
[INFO] [stderr]     Checking assert_matches v1.4.0
[INFO] [stderr]     Checking futures-task v0.3.7
[INFO] [stderr]    Compiling tokio v0.3.3
[INFO] [stderr]    Compiling darling_core v0.10.2
[INFO] [stderr]    Compiling async-attributes v1.1.1
[INFO] [stderr]    Compiling ergo-pin v0.1.0
[INFO] [stderr]    Compiling semver-parser v0.10.1
[INFO] [stderr]    Compiling pin-project-internal v0.4.27
[INFO] [stderr]    Compiling futures-macro v0.3.7
[INFO] [stderr]     Checking futures-channel v0.3.7
[INFO] [stderr]     Checking futures-lite v1.11.2
[INFO] [stderr]     Checking async-channel v1.5.1
[INFO] [stderr]    Compiling semver v0.11.0
[INFO] [stderr]    Compiling rustc_version v0.3.0
[INFO] [stderr]     Checking futures-util v0.3.7
[INFO] [stderr]     Checking async-io v1.1.10
[INFO] [stderr]     Checking async-executor v1.3.0
[INFO] [stderr]     Checking blocking v1.0.2
[INFO] [stderr]    Compiling futures_ringbuf v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking async-global-executor v1.4.3
[INFO] [stderr]     Checking tokio-util v0.5.0
[INFO] [stderr]     Checking async-std v1.6.5
[INFO] [stderr]    Compiling darling_macro v0.10.2
[INFO] [stderr]     Checking pin-project v0.4.27
[INFO] [stderr]    Compiling darling v0.10.2
[INFO] [stderr]    Compiling log-derive v0.4.1
[INFO] [stderr]     Checking futures-executor v0.3.7
[INFO] [stderr]     Checking futures v0.3.7
[INFO] [stderr]     Checking futures-test v0.3.7
[INFO] [stderr]     Checking futures_codec v0.4.1
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 42.77s
[INFO] running `Command { std: "docker" "inspect" "09203b455072cb16d5ad7ccd51a85a34d11f953ccda3c309fb3e2445a50d2f1f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "09203b455072cb16d5ad7ccd51a85a34d11f953ccda3c309fb3e2445a50d2f1f", kill_on_drop: false }`
[INFO] [stdout] 09203b455072cb16d5ad7ccd51a85a34d11f953ccda3c309fb3e2445a50d2f1f