[INFO] cloning repository https://github.com/siewchongche/rust-practice
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/siewchongche/rust-practice" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsiewchongche%2Frust-practice", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsiewchongche%2Frust-practice'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f25023d8518875b5d998ae91e5f4777391e2fbce
[INFO] building siewchongche/rust-practice against master#d59f06fc64844ec2073e5e888f7470989ef25ff9 for pr-119440
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsiewchongche%2Frust-practice" "/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/siewchongche/rust-practice on toolchain d59f06fc64844ec2073e5e888f7470989ef25ff9
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d59f06fc64844ec2073e5e888f7470989ef25ff9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/siewchongche/rust-practice
[INFO] finished tweaking git repo https://github.com/siewchongche/rust-practice
[INFO] tweaked toml for git repo https://github.com/siewchongche/rust-practice written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/siewchongche/rust-practice 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" "+d59f06fc64844ec2073e5e888f7470989ef25ff9" "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] building siewchongche/rust-practice against try#fe8f664b41f030f307cfeb6cb8c3a1419292aeed for pr-119440
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsiewchongche%2Frust-practice" "/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/siewchongche/rust-practice on toolchain fe8f664b41f030f307cfeb6cb8c3a1419292aeed
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fe8f664b41f030f307cfeb6cb8c3a1419292aeed" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/siewchongche/rust-practice
[INFO] finished tweaking git repo https://github.com/siewchongche/rust-practice
[INFO] tweaked toml for git repo https://github.com/siewchongche/rust-practice written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/siewchongche/rust-practice 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" "+fe8f664b41f030f307cfeb6cb8c3a1419292aeed" "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] building siewchongche/rust-practice against try#fe8f664b41f030f307cfeb6cb8c3a1419292aeed for pr-119440
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsiewchongche%2Frust-practice" "/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/siewchongche/rust-practice on toolchain fe8f664b41f030f307cfeb6cb8c3a1419292aeed
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+fe8f664b41f030f307cfeb6cb8c3a1419292aeed" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/siewchongche/rust-practice
[INFO] finished tweaking git repo https://github.com/siewchongche/rust-practice
[INFO] tweaked toml for git repo https://github.com/siewchongche/rust-practice written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/siewchongche/rust-practice 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" "+fe8f664b41f030f307cfeb6cb8c3a1419292aeed" "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" "+fe8f664b41f030f307cfeb6cb8c3a1419292aeed" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 354e44fb45388ec5456ed3e7ffbe9c2a77fd3e54f1eff373093d2246d61cb235
[INFO] running `Command { std: "docker" "start" "-a" "354e44fb45388ec5456ed3e7ffbe9c2a77fd3e54f1eff373093d2246d61cb235", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "354e44fb45388ec5456ed3e7ffbe9c2a77fd3e54f1eff373093d2246d61cb235", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "354e44fb45388ec5456ed3e7ffbe9c2a77fd3e54f1eff373093d2246d61cb235", kill_on_drop: false }`
[INFO] [stdout] 354e44fb45388ec5456ed3e7ffbe9c2a77fd3e54f1eff373093d2246d61cb235
[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" "+fe8f664b41f030f307cfeb6cb8c3a1419292aeed" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 80c4f7d7aa6663eb8580e8f6da8c340512b55d6ce07cbc5a63ba9721df5f66e7
[INFO] running `Command { std: "docker" "start" "-a" "80c4f7d7aa6663eb8580e8f6da8c340512b55d6ce07cbc5a63ba9721df5f66e7", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.124
[INFO] [stderr]    Compiling getrandom v0.2.6
[INFO] [stderr]    Compiling rand_core v0.6.3
[INFO] [stderr]    Compiling rand_chacha v0.3.1
[INFO] [stderr]    Compiling rand v0.8.5
[INFO] [stderr]    Compiling playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.63s
[INFO] running `Command { std: "docker" "inspect" "80c4f7d7aa6663eb8580e8f6da8c340512b55d6ce07cbc5a63ba9721df5f66e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "80c4f7d7aa6663eb8580e8f6da8c340512b55d6ce07cbc5a63ba9721df5f66e7", kill_on_drop: false }`
[INFO] [stdout] 80c4f7d7aa6663eb8580e8f6da8c340512b55d6ce07cbc5a63ba9721df5f66e7
[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" "+fe8f664b41f030f307cfeb6cb8c3a1419292aeed" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0761b3c7091eb97238b01419dd7fdfcb971657e45987e3f707cfc6a350673b72
[INFO] running `Command { std: "docker" "start" "-a" "0761b3c7091eb97238b01419dd7fdfcb971657e45987e3f707cfc6a350673b72", kill_on_drop: false }`
[INFO] [stderr]    Compiling playground v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.22s
[INFO] running `Command { std: "docker" "inspect" "0761b3c7091eb97238b01419dd7fdfcb971657e45987e3f707cfc6a350673b72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0761b3c7091eb97238b01419dd7fdfcb971657e45987e3f707cfc6a350673b72", kill_on_drop: false }`
[INFO] [stdout] 0761b3c7091eb97238b01419dd7fdfcb971657e45987e3f707cfc6a350673b72