[INFO] cloning repository https://github.com/techyangj/tokio-chat
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/techyangj/tokio-chat" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftechyangj%2Ftokio-chat", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftechyangj%2Ftokio-chat'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2fe1f5cc63d8f8a0ba4d297e3da53f0626703a8a
[INFO] checking techyangj/tokio-chat against master#30840c53f414b753cb08f14620906572f88dda4b for pr-123531
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftechyangj%2Ftokio-chat" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/techyangj/tokio-chat on toolchain 30840c53f414b753cb08f14620906572f88dda4b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+30840c53f414b753cb08f14620906572f88dda4b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/techyangj/tokio-chat
[INFO] finished tweaking git repo https://github.com/techyangj/tokio-chat
[INFO] tweaked toml for git repo https://github.com/techyangj/tokio-chat written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/techyangj/tokio-chat 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" "+30840c53f414b753cb08f14620906572f88dda4b" "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 techyangj/tokio-chat against try#18fb860b8a8e7ca508746882328061d0fe352543 for pr-123531
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftechyangj%2Ftokio-chat" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/techyangj/tokio-chat on toolchain 18fb860b8a8e7ca508746882328061d0fe352543
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+18fb860b8a8e7ca508746882328061d0fe352543" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/techyangj/tokio-chat
[INFO] finished tweaking git repo https://github.com/techyangj/tokio-chat
[INFO] tweaked toml for git repo https://github.com/techyangj/tokio-chat written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/techyangj/tokio-chat 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" "+18fb860b8a8e7ca508746882328061d0fe352543" "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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+18fb860b8a8e7ca508746882328061d0fe352543" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 07bbfa91392d39a78e036073f1f38ddec5a65dd73ed81ab7f9c83dfd6c55a701
[INFO] running `Command { std: "docker" "start" "-a" "07bbfa91392d39a78e036073f1f38ddec5a65dd73ed81ab7f9c83dfd6c55a701", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "07bbfa91392d39a78e036073f1f38ddec5a65dd73ed81ab7f9c83dfd6c55a701", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "07bbfa91392d39a78e036073f1f38ddec5a65dd73ed81ab7f9c83dfd6c55a701", kill_on_drop: false }`
[INFO] [stdout] 07bbfa91392d39a78e036073f1f38ddec5a65dd73ed81ab7f9c83dfd6c55a701
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+18fb860b8a8e7ca508746882328061d0fe352543" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 540aef8e12f4a7fab4fb764192d475996e8fc7ff93e0071a7dfe8ae4b3c2f0d1
[INFO] running `Command { std: "docker" "start" "-a" "540aef8e12f4a7fab4fb764192d475996e8fc7ff93e0071a7dfe8ae4b3c2f0d1", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]     Checking once_cell v1.14.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.43
[INFO] [stderr]    Compiling quote v1.0.21
[INFO] [stderr]    Compiling lock_api v0.4.8
[INFO] [stderr]    Compiling tokio v1.21.0
[INFO] [stderr]     Checking socket2 v0.4.7
[INFO] [stderr]     Checking mio v0.8.4
[INFO] [stderr]     Checking parking_lot v0.12.1
[INFO] [stderr]    Compiling tokio-macros v1.8.0
[INFO] [stderr]     Checking tokio_chat v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `AsyncReadExt`
[INFO] [stdout]  --> src/main.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 | use tokio::io::{AsyncReadExt, AsyncWriteExt, BufReader, AsyncBufReadExt};
[INFO] [stdout]   |                 ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `AsyncReadExt`
[INFO] [stdout]  --> src/main.rs:2:17
[INFO] [stdout]   |
[INFO] [stdout] 2 | use tokio::io::{AsyncReadExt, AsyncWriteExt, BufReader, AsyncBufReadExt};
[INFO] [stdout]   |                 ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rx`
[INFO] [stdout]   --> src/main.rs:18:18
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let (tx, mut rx) = broadcast::channel(10);
[INFO] [stdout]    |                  ^^ help: if this is intentional, prefix it with an underscore: `_rx`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rx`
[INFO] [stdout]   --> src/main.rs:18:18
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let (tx, mut rx) = broadcast::channel(10);
[INFO] [stdout]    |                  ^^ help: if this is intentional, prefix it with an underscore: `_rx`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:18:14
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let (tx, mut rx) = broadcast::channel(10);
[INFO] [stdout]    |              ----^^
[INFO] [stdout]    |              |
[INFO] [stdout]    |              help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/main.rs:18:14
[INFO] [stdout]    |
[INFO] [stdout] 18 |     let (tx, mut rx) = broadcast::channel(10);
[INFO] [stdout]    |              ----^^
[INFO] [stdout]    |              |
[INFO] [stdout]    |              help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.05s
[INFO] running `Command { std: "docker" "inspect" "540aef8e12f4a7fab4fb764192d475996e8fc7ff93e0071a7dfe8ae4b3c2f0d1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "540aef8e12f4a7fab4fb764192d475996e8fc7ff93e0071a7dfe8ae4b3c2f0d1", kill_on_drop: false }`
[INFO] [stdout] 540aef8e12f4a7fab4fb764192d475996e8fc7ff93e0071a7dfe8ae4b3c2f0d1