[INFO] cloning repository https://github.com/kcexn/learn_rust_palindrome_checker
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kcexn/learn_rust_palindrome_checker" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkcexn%2Flearn_rust_palindrome_checker", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkcexn%2Flearn_rust_palindrome_checker'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] de3798a921f61d9aa8bee2709717b9901a7d4507
[INFO] checking kcexn/learn_rust_palindrome_checker against master#bb89df6903539e7014b8db29bccd6a9ee9553122 for pr-121072
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkcexn%2Flearn_rust_palindrome_checker" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kcexn/learn_rust_palindrome_checker on toolchain bb89df6903539e7014b8db29bccd6a9ee9553122
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bb89df6903539e7014b8db29bccd6a9ee9553122" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kcexn/learn_rust_palindrome_checker
[INFO] finished tweaking git repo https://github.com/kcexn/learn_rust_palindrome_checker
[INFO] tweaked toml for git repo https://github.com/kcexn/learn_rust_palindrome_checker written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/kcexn/learn_rust_palindrome_checker 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" "+bb89df6903539e7014b8db29bccd6a9ee9553122" "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] checking kcexn/learn_rust_palindrome_checker against try#e2d5da3bc6e298ce5f33ab9bd4e47f6a307ec8d0 for pr-121072
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkcexn%2Flearn_rust_palindrome_checker" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kcexn/learn_rust_palindrome_checker on toolchain e2d5da3bc6e298ce5f33ab9bd4e47f6a307ec8d0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e2d5da3bc6e298ce5f33ab9bd4e47f6a307ec8d0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kcexn/learn_rust_palindrome_checker
[INFO] finished tweaking git repo https://github.com/kcexn/learn_rust_palindrome_checker
[INFO] tweaked toml for git repo https://github.com/kcexn/learn_rust_palindrome_checker written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/kcexn/learn_rust_palindrome_checker 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" "+e2d5da3bc6e298ce5f33ab9bd4e47f6a307ec8d0" "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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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" "+e2d5da3bc6e298ce5f33ab9bd4e47f6a307ec8d0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 12368e5b2cd62519b320b2a50660e6f64cc354c1d798198c8e04aaec33a5de09
[INFO] running `Command { std: "docker" "start" "-a" "12368e5b2cd62519b320b2a50660e6f64cc354c1d798198c8e04aaec33a5de09", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "12368e5b2cd62519b320b2a50660e6f64cc354c1d798198c8e04aaec33a5de09", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "12368e5b2cd62519b320b2a50660e6f64cc354c1d798198c8e04aaec33a5de09", kill_on_drop: false }`
[INFO] [stdout] 12368e5b2cd62519b320b2a50660e6f64cc354c1d798198c8e04aaec33a5de09
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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" "+e2d5da3bc6e298ce5f33ab9bd4e47f6a307ec8d0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ebd5f48a696418c0234f0834d0a82c3317343c5d67f5ff531cdfa48bcc9823f6
[INFO] running `Command { std: "docker" "start" "-a" "ebd5f48a696418c0234f0834d0a82c3317343c5d67f5ff531cdfa48bcc9823f6", kill_on_drop: false }`
[INFO] [stderr]     Checking utils v0.1.0 (/opt/rustwide/workdir/utils)
[INFO] [stderr]     Checking palindrome_checker v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] running `Command { std: "docker" "inspect" "ebd5f48a696418c0234f0834d0a82c3317343c5d67f5ff531cdfa48bcc9823f6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ebd5f48a696418c0234f0834d0a82c3317343c5d67f5ff531cdfa48bcc9823f6", kill_on_drop: false }`
[INFO] [stdout] ebd5f48a696418c0234f0834d0a82c3317343c5d67f5ff531cdfa48bcc9823f6