[INFO] cloning repository https://github.com/toorajtaraz/cpu_scheduler
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/toorajtaraz/cpu_scheduler" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftoorajtaraz%2Fcpu_scheduler", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftoorajtaraz%2Fcpu_scheduler'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d84aee888d73d7a842afb3e03b90cc7106e80812
[INFO] checking toorajtaraz/cpu_scheduler against try#8384de5d92dd9b1c0b67caa5c1c1b11bf606490f for pr-146300
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftoorajtaraz%2Fcpu_scheduler" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/toorajtaraz/cpu_scheduler
[INFO] finished tweaking git repo https://github.com/toorajtaraz/cpu_scheduler
[INFO] tweaked toml for git repo https://github.com/toorajtaraz/cpu_scheduler written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/toorajtaraz/cpu_scheduler on toolchain 8384de5d92dd9b1c0b67caa5c1c1b11bf606490f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8384de5d92dd9b1c0b67caa5c1c1b11bf606490f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/toorajtaraz/cpu_scheduler 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" "+8384de5d92dd9b1c0b67caa5c1c1b11bf606490f" "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] checking toorajtaraz/cpu_scheduler against try#8384de5d92dd9b1c0b67caa5c1c1b11bf606490f for pr-146300
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftoorajtaraz%2Fcpu_scheduler" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/toorajtaraz/cpu_scheduler
[INFO] finished tweaking git repo https://github.com/toorajtaraz/cpu_scheduler
[INFO] tweaked toml for git repo https://github.com/toorajtaraz/cpu_scheduler written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/toorajtaraz/cpu_scheduler on toolchain 8384de5d92dd9b1c0b67caa5c1c1b11bf606490f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8384de5d92dd9b1c0b67caa5c1c1b11bf606490f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/toorajtaraz/cpu_scheduler 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" "+8384de5d92dd9b1c0b67caa5c1c1b11bf606490f" "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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+8384de5d92dd9b1c0b67caa5c1c1b11bf606490f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 44e38eef4fafeb162795fa87f44bd7174727213371b54f3dbd5830009ea56637
[INFO] running `Command { std: "docker" "start" "-a" "44e38eef4fafeb162795fa87f44bd7174727213371b54f3dbd5830009ea56637", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "44e38eef4fafeb162795fa87f44bd7174727213371b54f3dbd5830009ea56637", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44e38eef4fafeb162795fa87f44bd7174727213371b54f3dbd5830009ea56637", kill_on_drop: false }`
[INFO] [stdout] 44e38eef4fafeb162795fa87f44bd7174727213371b54f3dbd5830009ea56637
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+8384de5d92dd9b1c0b67caa5c1c1b11bf606490f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dbacf169be3c019a61bd0842c225087c9eec3aa4c210155a587e75bd33e42d4e
[INFO] running `Command { std: "docker" "start" "-a" "dbacf169be3c019a61bd0842c225087c9eec3aa4c210155a587e75bd33e42d4e", kill_on_drop: false }`
[INFO] [stderr]     Checking cpu_scheduler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/util/workers.rs:432:17
[INFO] [stdout]     |
[INFO] [stdout] 432 |                 drop(lock);
[INFO] [stdout]     |                 ^^^^^----^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      argument has type `&std::sync::Mutex<Vec<VecDeque<workers::Task>>>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 432 -                 drop(lock);
[INFO] [stdout] 432 +                 let _ = lock;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/util/workers.rs:432:17
[INFO] [stdout]     |
[INFO] [stdout] 432 |                 drop(lock);
[INFO] [stdout]     |                 ^^^^^----^
[INFO] [stdout]     |                      |
[INFO] [stdout]     |                      argument has type `&std::sync::Mutex<Vec<VecDeque<workers::Task>>>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 432 -                 drop(lock);
[INFO] [stdout] 432 +                 let _ = lock;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.11s
[INFO] running `Command { std: "docker" "inspect" "dbacf169be3c019a61bd0842c225087c9eec3aa4c210155a587e75bd33e42d4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dbacf169be3c019a61bd0842c225087c9eec3aa4c210155a587e75bd33e42d4e", kill_on_drop: false }`
[INFO] [stdout] dbacf169be3c019a61bd0842c225087c9eec3aa4c210155a587e75bd33e42d4e