[INFO] fetching crate nbd-async 0.4.1...
[INFO] checking nbd-async-0.4.1 against master#db1fb85cff63ad5fffe435e17128f99f9e1d970c for pr-89056
[INFO] extracting crate nbd-async 0.4.1 into /workspace/builds/worker-24/source
[INFO] validating manifest of crates.io crate nbd-async 0.4.1 on toolchain db1fb85cff63ad5fffe435e17128f99f9e1d970c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate nbd-async 0.4.1
[INFO] finished tweaking crates.io crate nbd-async 0.4.1
[INFO] tweaked toml for crates.io crate nbd-async 0.4.1 written to /workspace/builds/worker-24/source/Cargo.toml
[INFO] crate crates.io crate nbd-async 0.4.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "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-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4710680cea23d5bf20362cc21acb1a6bf8a163b77f1faaf324dc32de395ce51f
[INFO] running `Command { std: "docker" "start" "-a" "4710680cea23d5bf20362cc21acb1a6bf8a163b77f1faaf324dc32de395ce51f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4710680cea23d5bf20362cc21acb1a6bf8a163b77f1faaf324dc32de395ce51f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4710680cea23d5bf20362cc21acb1a6bf8a163b77f1faaf324dc32de395ce51f", kill_on_drop: false }`
[INFO] [stdout] 4710680cea23d5bf20362cc21acb1a6bf8a163b77f1faaf324dc32de395ce51f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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" "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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 08c82d98a957014572133934c8e3bb6c67cf99d9fe565e83a61f6051065fc3bc
[INFO] running `Command { std: "docker" "start" "-a" "08c82d98a957014572133934c8e3bb6c67cf99d9fe565e83a61f6051065fc3bc", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.31
[INFO] [stderr]    Compiling libc v0.2.91
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling pin-project-internal v0.4.22
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking bytes v1.0.1
[INFO] [stderr]     Checking futures-core v0.3.5
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]     Checking pin-project-lite v0.2.6
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling tokio v1.4.0
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking nix v0.20.0
[INFO] [stderr]     Checking mio v0.7.11
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]    Compiling tokio-macros v1.1.0
[INFO] [stderr]    Compiling async-trait v0.1.36
[INFO] [stderr]     Checking pin-project v0.4.22
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking nbd-async v0.4.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `fua`
[INFO] [stdout]   --> src/nbd.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fua: bool,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `no_hole`
[INFO] [stdout]   --> src/nbd.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     no_hole: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `fua`
[INFO] [stdout]   --> src/nbd.rs:24:5
[INFO] [stdout]    |
[INFO] [stdout] 24 |     fua: bool,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `no_hole`
[INFO] [stdout]   --> src/nbd.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     no_hole: bool,
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 29.32s
[INFO] running `Command { std: "docker" "inspect" "08c82d98a957014572133934c8e3bb6c67cf99d9fe565e83a61f6051065fc3bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "08c82d98a957014572133934c8e3bb6c67cf99d9fe565e83a61f6051065fc3bc", kill_on_drop: false }`
[INFO] [stdout] 08c82d98a957014572133934c8e3bb6c67cf99d9fe565e83a61f6051065fc3bc