[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 1.60.0 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 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "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" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded io-uring v0.5.2
[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" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bb037b4470439d269ef594f68f0213fffbd661fa991e44a6ae78d4e3aa3b8deb
[INFO] running `Command { std: "docker" "start" "-a" "bb037b4470439d269ef594f68f0213fffbd661fa991e44a6ae78d4e3aa3b8deb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bb037b4470439d269ef594f68f0213fffbd661fa991e44a6ae78d4e3aa3b8deb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb037b4470439d269ef594f68f0213fffbd661fa991e44a6ae78d4e3aa3b8deb", kill_on_drop: false }`
[INFO] [stdout] bb037b4470439d269ef594f68f0213fffbd661fa991e44a6ae78d4e3aa3b8deb
[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" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] cff0dc3064e617339b611241ec5173fe3aa201d953f5960afb934c95aa75e814
[INFO] running `Command { std: "docker" "start" "-a" "cff0dc3064e617339b611241ec5173fe3aa201d953f5960afb934c95aa75e814", 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 socket2 v0.4.4
[INFO] [stderr]    Compiling signal-hook-registry v1.4.0
[INFO] [stderr]    Compiling futures-macro v0.3.21
[INFO] [stderr]    Compiling tokio-macros v1.7.0
[INFO] [stderr]    Compiling mio v0.8.0
[INFO] [stderr]    Compiling parking_lot v0.12.0
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]    Compiling tokio v1.17.0
[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] 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] warning: value assigned to `requests` is never read
[INFO] [stdout]    --> src/main.rs:413:17
[INFO] [stdout]     |
[INFO] [stdout] 413 |         let mut requests = VecDeque::new();
[INFO] [stdout]     |                 ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `requests` is never read
[INFO] [stdout]    --> src/main.rs:546:17
[INFO] [stdout]     |
[INFO] [stdout] 546 |         let mut requests = VecDeque::new();
[INFO] [stdout]     |                 ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `handle`
[INFO] [stdout]    --> src/main.rs:846:9
[INFO] [stdout]     |
[INFO] [stdout] 846 |     let handle = log_worker_sync(
[INFO] [stdout]     |         ^^^^^^ help: if this is intentional, prefix it with an underscore: `_handle`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `data_sync`
[INFO] [stdout]    --> src/main.rs:288:13
[INFO] [stdout]     |
[INFO] [stdout] 288 |         let data_sync = opcode::Fsync::new(types::Fd(writer.as_raw_fd()))
[INFO] [stdout]     |             ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_data_sync`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `writer`
[INFO] [stdout]    --> src/main.rs:355:55
[INFO] [stdout]     |
[INFO] [stdout] 355 |     fn submit_switch_task<Writer: AsRawFd>(&mut self, writer: &Writer) {
[INFO] [stdout]     |                                                       ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `Result`
[INFO] [stdout]   --> src/main.rs:17:1
[INFO] [stdout]    |
[INFO] [stdout] 17 | type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `BLOCK_SIZE`
[INFO] [stdout]   --> src/main.rs:66:1
[INFO] [stdout]    |
[INFO] [stdout] 66 | const BLOCK_SIZE: usize = 1024;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `space`
[INFO] [stdout]   --> src/main.rs:85:5
[INFO] [stdout]    |
[INFO] [stdout] 85 |     space: Box<Aligned<MAX_BLOCK_SIZE>>,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `allocated`
[INFO] [stdout]   --> src/main.rs:87:5
[INFO] [stdout]    |
[INFO] [stdout] 87 |     allocated: usize,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/main.rs:91:8
[INFO] [stdout]    |
[INFO] [stdout] 91 |     fn new() -> Self {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `size`
[INFO] [stdout]    --> src/main.rs:110:5
[INFO] [stdout]     |
[INFO] [stdout] 110 |     size: usize,
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/main.rs:115:8
[INFO] [stdout]     |
[INFO] [stdout] 115 |     fn new() -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `consumed`
[INFO] [stdout]    --> src/main.rs:124:8
[INFO] [stdout]     |
[INFO] [stdout] 124 |     fn consumed(&self) -> usize {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `len`
[INFO] [stdout]    --> src/main.rs:130:8
[INFO] [stdout]     |
[INFO] [stdout] 130 |     fn len(&self) -> usize {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `free`
[INFO] [stdout]    --> src/main.rs:134:8
[INFO] [stdout]     |
[INFO] [stdout] 134 |     fn free(&self) -> usize {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `extend`
[INFO] [stdout]    --> src/main.rs:139:8
[INFO] [stdout]     |
[INFO] [stdout] 139 |     fn extend(&mut self, src: &[u8]) {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `extend_zero`
[INFO] [stdout]    --> src/main.rs:148:8
[INFO] [stdout]     |
[INFO] [stdout] 148 |     fn extend_zero(&mut self, size: usize) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `split`
[INFO] [stdout]    --> src/main.rs:157:8
[INFO] [stdout]     |
[INFO] [stdout] 157 |     fn split(&mut self) -> IOBlockView {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `buf`
[INFO] [stdout]    --> src/main.rs:179:5
[INFO] [stdout]     |
[INFO] [stdout] 179 |     buf: &'static [u8],
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Completion`
[INFO] [stdout]    --> src/main.rs:188:8
[INFO] [stdout]     |
[INFO] [stdout] 188 | struct Completion {
[INFO] [stdout]     |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]    --> src/main.rs:195:8
[INFO] [stdout]     |
[INFO] [stdout] 195 |     fn new(requests: Vec<(u64, oneshot::Sender<u64>)>, block_ref: IOBlockView) -> Self {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `on_complete`
[INFO] [stdout]    --> src/main.rs:207:8
[INFO] [stdout]     |
[INFO] [stdout] 207 |     fn on_complete(self, result: i32) {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Worker`
[INFO] [stdout]    --> src/main.rs:250:8
[INFO] [stdout]     |
[INFO] [stdout] 250 | struct Worker {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `append`
[INFO] [stdout]    --> src/main.rs:276:8
[INFO] [stdout]     |
[INFO] [stdout] 276 |     fn append<Writer: AsRawFd>(&mut self, writer: &Writer, completion: Box<Completion>) -> bool {
[INFO] [stdout]     |        ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `consume_next_request`
[INFO] [stdout]    --> src/main.rs:313:8
[INFO] [stdout]     |
[INFO] [stdout] 313 |     fn consume_next_request(&mut self) -> bool {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `submit_switch_task`
[INFO] [stdout]    --> src/main.rs:355:8
[INFO] [stdout]     |
[INFO] [stdout] 355 |     fn submit_switch_task<Writer: AsRawFd>(&mut self, writer: &Writer) {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `log_worker_sync_with_block_size`
[INFO] [stdout]    --> src/main.rs:382:4
[INFO] [stdout]     |
[INFO] [stdout] 382 | fn log_worker_sync_with_block_size(
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `log_worker`
[INFO] [stdout]    --> src/main.rs:653:4
[INFO] [stdout]     |
[INFO] [stdout] 653 | fn log_worker(
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable 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] error: aborting due to previous error; 31 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; 31 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "cff0dc3064e617339b611241ec5173fe3aa201d953f5960afb934c95aa75e814", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cff0dc3064e617339b611241ec5173fe3aa201d953f5960afb934c95aa75e814", kill_on_drop: false }`
[INFO] [stdout] cff0dc3064e617339b611241ec5173fe3aa201d953f5960afb934c95aa75e814