[INFO] fetching crate nqueens-oxigen 2.2.0...
[INFO] testing nqueens-oxigen-2.2.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate nqueens-oxigen 2.2.0 into /workspace/builds/worker-38/source
[INFO] validating manifest of crates.io crate nqueens-oxigen 2.2.0 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] started tweaking crates.io crate nqueens-oxigen 2.2.0
[INFO] finished tweaking crates.io crate nqueens-oxigen 2.2.0
[INFO] tweaked toml for crates.io crate nqueens-oxigen 2.2.0 written to /workspace/builds/worker-38/source/Cargo.toml
[INFO] crate crates.io crate nqueens-oxigen 2.2.0 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/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] 49690dd90f02474811bd14326b93f0ef151fb34d32426b9f667fe3be54f1dfbe
[INFO] running `Command { std: "docker" "start" "-a" "49690dd90f02474811bd14326b93f0ef151fb34d32426b9f667fe3be54f1dfbe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "49690dd90f02474811bd14326b93f0ef151fb34d32426b9f667fe3be54f1dfbe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "49690dd90f02474811bd14326b93f0ef151fb34d32426b9f667fe3be54f1dfbe", kill_on_drop: false }`
[INFO] [stdout] 49690dd90f02474811bd14326b93f0ef151fb34d32426b9f667fe3be54f1dfbe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/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] 351739a460bf58e38634efe5b8183b3fd779a047609f872502aa9ccc67ae0057
[INFO] running `Command { std: "docker" "start" "-a" "351739a460bf58e38634efe5b8183b3fd779a047609f872502aa9ccc67ae0057", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling libc v0.2.82
[INFO] [stderr]    Compiling const_fn v0.4.5
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling rayon-core v1.9.0
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]    Compiling historian v4.0.3
[INFO] [stderr]    Compiling crossbeam-utils v0.8.1
[INFO] [stderr]    Compiling memoffset v0.6.1
[INFO] [stderr]    Compiling rayon v1.5.0
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand_pcg v0.2.1
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.1
[INFO] [stderr]    Compiling crossbeam-channel v0.5.0
[INFO] [stderr]    Compiling crossbeam-deque v0.8.0
[INFO] [stderr]    Compiling oxigen v2.2.0
[INFO] [stderr]    Compiling nqueens-oxigen v2.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 16.61s
[INFO] running `Command { std: "docker" "inspect" "351739a460bf58e38634efe5b8183b3fd779a047609f872502aa9ccc67ae0057", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "351739a460bf58e38634efe5b8183b3fd779a047609f872502aa9ccc67ae0057", kill_on_drop: false }`
[INFO] [stdout] 351739a460bf58e38634efe5b8183b3fd779a047609f872502aa9ccc67ae0057
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/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" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 61113eeee205a3db73351086ab112941f677ee0cf840948e30088c1774df1f88
[INFO] running `Command { std: "docker" "start" "-a" "61113eeee205a3db73351086ab112941f677ee0cf840948e30088c1774df1f88", kill_on_drop: false }`
[INFO] [stderr]    Compiling nqueens-oxigen v2.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.00s
[INFO] running `Command { std: "docker" "inspect" "61113eeee205a3db73351086ab112941f677ee0cf840948e30088c1774df1f88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61113eeee205a3db73351086ab112941f677ee0cf840948e30088c1774df1f88", kill_on_drop: false }`
[INFO] [stdout] 61113eeee205a3db73351086ab112941f677ee0cf840948e30088c1774df1f88
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/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" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] f0646fcbc08c1b96966ebbd636cc346199b11ebbaee039ab6ce7ba7142b8b46c
[INFO] running `Command { std: "docker" "start" "-a" "f0646fcbc08c1b96966ebbd636cc346199b11ebbaee039ab6ce7ba7142b8b46c", kill_on_drop: false }`
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/nqueens_oxigen-0d65b084f1ec33f5)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "f0646fcbc08c1b96966ebbd636cc346199b11ebbaee039ab6ce7ba7142b8b46c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f0646fcbc08c1b96966ebbd636cc346199b11ebbaee039ab6ce7ba7142b8b46c", kill_on_drop: false }`
[INFO] [stdout] f0646fcbc08c1b96966ebbd636cc346199b11ebbaee039ab6ce7ba7142b8b46c