[INFO] cloning repository https://github.com/sweepline/knights_tour
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sweepline/knights_tour" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsweepline%2Fknights_tour", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsweepline%2Fknights_tour'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4be8192e111ab2cd27ca12f45c5bba32e185b38d
[INFO] testing sweepline/knights_tour against master#ff2c56344c764af598ad33027e9c7a48881808ef for pr-118825
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsweepline%2Fknights_tour" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sweepline/knights_tour on toolchain ff2c56344c764af598ad33027e9c7a48881808ef
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ff2c56344c764af598ad33027e9c7a48881808ef" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sweepline/knights_tour
[INFO] finished tweaking git repo https://github.com/sweepline/knights_tour
[INFO] tweaked toml for git repo https://github.com/sweepline/knights_tour written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/sweepline/knights_tour already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ff2c56344c764af598ad33027e9c7a48881808ef" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] testing sweepline/knights_tour against try#5e4273472e1b2f223618a9b3def795f6224f241d for pr-118825
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsweepline%2Fknights_tour" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sweepline/knights_tour on toolchain 5e4273472e1b2f223618a9b3def795f6224f241d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5e4273472e1b2f223618a9b3def795f6224f241d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sweepline/knights_tour
[INFO] finished tweaking git repo https://github.com/sweepline/knights_tour
[INFO] tweaked toml for git repo https://github.com/sweepline/knights_tour written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/sweepline/knights_tour already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5e4273472e1b2f223618a9b3def795f6224f241d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] testing sweepline/knights_tour against try#5e4273472e1b2f223618a9b3def795f6224f241d for pr-118825
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsweepline%2Fknights_tour" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/sweepline/knights_tour on toolchain 5e4273472e1b2f223618a9b3def795f6224f241d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5e4273472e1b2f223618a9b3def795f6224f241d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/sweepline/knights_tour
[INFO] finished tweaking git repo https://github.com/sweepline/knights_tour
[INFO] tweaked toml for git repo https://github.com/sweepline/knights_tour written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/sweepline/knights_tour already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+5e4273472e1b2f223618a9b3def795f6224f241d" "fetch" "--manifest-path" "Cargo.toml", 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+5e4273472e1b2f223618a9b3def795f6224f241d" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 375d11ccf0966d5d054de65c1fff35d2485329fcb7514cfdfa91df33204fa09b
[INFO] running `Command { std: "docker" "start" "-a" "375d11ccf0966d5d054de65c1fff35d2485329fcb7514cfdfa91df33204fa09b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "375d11ccf0966d5d054de65c1fff35d2485329fcb7514cfdfa91df33204fa09b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "375d11ccf0966d5d054de65c1fff35d2485329fcb7514cfdfa91df33204fa09b", kill_on_drop: false }`
[INFO] [stdout] 375d11ccf0966d5d054de65c1fff35d2485329fcb7514cfdfa91df33204fa09b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+5e4273472e1b2f223618a9b3def795f6224f241d" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 854d5b37366bfec1b3e2602a9a4c5713997d880858c3b183a0a6329c9c1f808d
[INFO] running `Command { std: "docker" "start" "-a" "854d5b37366bfec1b3e2602a9a4c5713997d880858c3b183a0a6329c9c1f808d", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.15
[INFO] [stderr]    Compiling memoffset v0.8.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.14
[INFO] [stderr]    Compiling libc v0.2.140
[INFO] [stderr]    Compiling rayon-core v1.11.0
[INFO] [stderr]    Compiling either v1.8.1
[INFO] [stderr]    Compiling crossbeam-channel v0.5.7
[INFO] [stderr]    Compiling crossbeam-deque v0.8.3
[INFO] [stderr]    Compiling num_cpus v1.15.0
[INFO] [stderr]    Compiling rayon v1.7.0
[INFO] [stderr]    Compiling knights_tour v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `print_board` is never used
[INFO] [stdout]    --> src/main.rs:263:4
[INFO] [stdout]     |
[INFO] [stdout] 263 | fn print_board(pos: &u8, visited: &Visited) {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.52s
[INFO] running `Command { std: "docker" "inspect" "854d5b37366bfec1b3e2602a9a4c5713997d880858c3b183a0a6329c9c1f808d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "854d5b37366bfec1b3e2602a9a4c5713997d880858c3b183a0a6329c9c1f808d", kill_on_drop: false }`
[INFO] [stdout] 854d5b37366bfec1b3e2602a9a4c5713997d880858c3b183a0a6329c9c1f808d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+5e4273472e1b2f223618a9b3def795f6224f241d" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3430b4e7f9e4608cbb2e4ebcbf8a6c5e6ca10601f90cdcd1db88559e29b16098
[INFO] running `Command { std: "docker" "start" "-a" "3430b4e7f9e4608cbb2e4ebcbf8a6c5e6ca10601f90cdcd1db88559e29b16098", kill_on_drop: false }`
[INFO] [stderr]    Compiling knights_tour v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `print_board` is never used
[INFO] [stdout]    --> src/main.rs:263:4
[INFO] [stdout]     |
[INFO] [stdout] 263 | fn print_board(pos: &u8, visited: &Visited) {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.48s
[INFO] running `Command { std: "docker" "inspect" "3430b4e7f9e4608cbb2e4ebcbf8a6c5e6ca10601f90cdcd1db88559e29b16098", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3430b4e7f9e4608cbb2e4ebcbf8a6c5e6ca10601f90cdcd1db88559e29b16098", kill_on_drop: false }`
[INFO] [stdout] 3430b4e7f9e4608cbb2e4ebcbf8a6c5e6ca10601f90cdcd1db88559e29b16098
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/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" "RUSTDOCFLAGS=--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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+5e4273472e1b2f223618a9b3def795f6224f241d" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 0fb580667ce841499e3b1ec1ece48d6bda83d1d79f7c72a89851940f6e783cca
[INFO] running `Command { std: "docker" "start" "-a" "0fb580667ce841499e3b1ec1ece48d6bda83d1d79f7c72a89851940f6e783cca", kill_on_drop: false }`
[INFO] [stderr] warning: function `print_board` is never used
[INFO] [stderr]    --> src/main.rs:263:4
[INFO] [stderr]     |
[INFO] [stderr] 263 | fn print_board(pos: &u8, visited: &Visited) {
[INFO] [stderr]     |    ^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `knights_tour` (bin "knights_tour" test) generated 1 warning
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/knights_tour-11bfb06dc7a06c8d)
[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" "0fb580667ce841499e3b1ec1ece48d6bda83d1d79f7c72a89851940f6e783cca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0fb580667ce841499e3b1ec1ece48d6bda83d1d79f7c72a89851940f6e783cca", kill_on_drop: false }`
[INFO] [stdout] 0fb580667ce841499e3b1ec1ece48d6bda83d1d79f7c72a89851940f6e783cca