[INFO] cloning repository https://github.com/w41ter-l/io_perf
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/w41ter-l/io_perf" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fw41ter-l%2Fio_perf", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fw41ter-l%2Fio_perf'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d6dc1c887b3d3f1357acbd9e065a2e4045a0aa10
[INFO] testing w41ter-l/io_perf against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fw41ter-l%2Fio_perf" "/workspace/builds/worker-22/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-22/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/w41ter-l/io_perf on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-22/source/.cargo/config
[INFO] removed /workspace/builds/worker-22/source/rust-toolchain.toml
[INFO] started tweaking git repo https://github.com/w41ter-l/io_perf
[INFO] finished tweaking git repo https://github.com/w41ter-l/io_perf
[INFO] tweaked toml for git repo https://github.com/w41ter-l/io_perf written to /workspace/builds/worker-22/source/Cargo.toml
[INFO] crate git repo https://github.com/w41ter-l/io_perf already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "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-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0da0cf48b86b3bde9887054b3b34258d4318010266e604e87ae31f8fe80ed311
[INFO] running `Command { std: "docker" "start" "-a" "0da0cf48b86b3bde9887054b3b34258d4318010266e604e87ae31f8fe80ed311", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0da0cf48b86b3bde9887054b3b34258d4318010266e604e87ae31f8fe80ed311", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0da0cf48b86b3bde9887054b3b34258d4318010266e604e87ae31f8fe80ed311", kill_on_drop: false }`
[INFO] [stdout] 0da0cf48b86b3bde9887054b3b34258d4318010266e604e87ae31f8fe80ed311
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 717e3e1260a194cd78e565fca4d096432df0f8aebe8183c71cf8de8b277ab82c
[INFO] running `Command { std: "docker" "start" "-a" "717e3e1260a194cd78e565fca4d096432df0f8aebe8183c71cf8de8b277ab82c", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling futures-core v0.3.21
[INFO] [stderr]    Compiling futures-channel v0.3.21
[INFO] [stderr]    Compiling parking_lot_core v0.9.1
[INFO] [stderr]    Compiling futures-sink v0.3.21
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]    Compiling io-uring v0.5.2
[INFO] [stderr]    Compiling async-trait v0.1.52
[INFO] [stderr]    Compiling signal-hook-registry v1.4.0
[INFO] [stderr]    Compiling socket2 v0.4.4
[INFO] [stderr]    Compiling futures-macro v0.3.21
[INFO] [stderr]    Compiling tokio-macros v1.7.0
[INFO] [stderr]    Compiling parking_lot v0.12.0
[INFO] [stderr]    Compiling mio v0.8.0
[INFO] [stderr]    Compiling tokio v1.17.0
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]    Compiling futures-executor v0.3.21
[INFO] [stderr]    Compiling futures v0.3.21
[INFO] [stderr]    Compiling io v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `char::MAX`
[INFO] [stdout]   --> src/main.rs:11:47
[INFO] [stdout]    |
[INFO] [stdout] 11 |     thread::JoinHandle, io::{Write, IoSlice}, char::MAX,
[INFO] [stdout]    |                                               ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(write_all_vectored)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]    --> src/main.rs:839:9
[INFO] [stdout]     |
[INFO] [stdout] 704 | /         loop {
[INFO] [stdout] 705 | |             // TODO:
[INFO] [stdout] 706 | |             // 2. how to lazy polling?
[INFO] [stdout] 707 | |             if !w.pending_completions.is_empty() || w.drain_req.is_some() {
[INFO] [stdout] ...   |
[INFO] [stdout] 837 | |             }
[INFO] [stdout] 838 | |         }
[INFO] [stdout]     | |_________- any code following this expression is unreachable
[INFO] [stdout] 839 |           println!("break to here");
[INFO] [stdout]     |           ^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]    --> src/main.rs:931:5
[INFO] [stdout]     |
[INFO] [stdout] 927 | /     loop {
[INFO] [stdout] 928 | |         std::thread::sleep(std::time::Duration::from_secs(1));
[INFO] [stdout] 929 | |     }
[INFO] [stdout]     | |_____- any code following this expression is unreachable
[INFO] [stdout] 930 | 
[INFO] [stdout] 931 |       handle.join().unwrap_or_default();
[INFO] [stdout]     |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `io` due to 2 previous errors; 3 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "717e3e1260a194cd78e565fca4d096432df0f8aebe8183c71cf8de8b277ab82c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "717e3e1260a194cd78e565fca4d096432df0f8aebe8183c71cf8de8b277ab82c", kill_on_drop: false }`
[INFO] [stdout] 717e3e1260a194cd78e565fca4d096432df0f8aebe8183c71cf8de8b277ab82c