[INFO] fetching crate utuntap 0.2.4...
[INFO] checking utuntap-0.2.4 against master#db1fb85cff63ad5fffe435e17128f99f9e1d970c for pr-89056
[INFO] extracting crate utuntap 0.2.4 into /workspace/builds/worker-16/source
[INFO] validating manifest of crates.io crate utuntap 0.2.4 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 utuntap 0.2.4
[INFO] finished tweaking crates.io crate utuntap 0.2.4
[INFO] tweaked toml for crates.io crate utuntap 0.2.4 written to /workspace/builds/worker-16/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded etherparse v0.9.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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] dcfc5fa5569ae56ff08f830acdac0d69f0c0c3d6f373b1c90c4e1801414b8172
[INFO] running `Command { std: "docker" "start" "-a" "dcfc5fa5569ae56ff08f830acdac0d69f0c0c3d6f373b1c90c4e1801414b8172", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dcfc5fa5569ae56ff08f830acdac0d69f0c0c3d6f373b1c90c4e1801414b8172", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dcfc5fa5569ae56ff08f830acdac0d69f0c0c3d6f373b1c90c4e1801414b8172", kill_on_drop: false }`
[INFO] [stdout] dcfc5fa5569ae56ff08f830acdac0d69f0c0c3d6f373b1c90c4e1801414b8172
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-16/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] 3cae55cabe461cb6472e4b6a85c44918acd7e392da0cceeb941d4aceb4358dec
[INFO] running `Command { std: "docker" "start" "-a" "3cae55cabe461cb6472e4b6a85c44918acd7e392da0cceeb941d4aceb4358dec", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.102
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling syn v1.0.76
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]    Compiling nix v0.17.0
[INFO] [stderr]     Checking void v1.0.2
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]    Compiling proc-macro2 v1.0.29
[INFO] [stderr]     Checking etherparse v0.9.0
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking parking_lot_core v0.7.2
[INFO] [stderr]     Checking parking_lot v0.10.2
[INFO] [stderr]    Compiling serial_test_derive v0.4.0
[INFO] [stderr]     Checking utuntap v0.2.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field is never read: `flags`
[INFO] [stdout]  --> src/interface/linux.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     flags: Flags,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking serial_test v0.4.0
[INFO] [stdout] warning: field is never read: `flags`
[INFO] [stdout]  --> src/interface/linux.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     flags: Flags,
[INFO] [stdout]   |     ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.99s
[INFO] running `Command { std: "docker" "inspect" "3cae55cabe461cb6472e4b6a85c44918acd7e392da0cceeb941d4aceb4358dec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3cae55cabe461cb6472e4b6a85c44918acd7e392da0cceeb941d4aceb4358dec", kill_on_drop: false }`
[INFO] [stdout] 3cae55cabe461cb6472e4b6a85c44918acd7e392da0cceeb941d4aceb4358dec