[INFO] fetching crate driverkit 0.3.0...
[INFO] checking driverkit-0.3.0 against try#575650af7d7ca88602df28e39d27bf3e456c306e for pr-80579
[INFO] extracting crate driverkit 0.3.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate driverkit 0.3.0 on toolchain 575650af7d7ca88602df28e39d27bf3e456c306e
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+575650af7d7ca88602df28e39d27bf3e456c306e" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate driverkit 0.3.0
[INFO] finished tweaking crates.io crate driverkit 0.3.0
[INFO] tweaked toml for crates.io crate driverkit 0.3.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate driverkit 0.3.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+575650af7d7ca88602df28e39d27bf3e456c306e" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded remove_dir_all v0.5.2
[INFO] [stderr]   Downloaded tempdir v0.3.7
[INFO] [stderr]   Downloaded rand v0.4.6
[INFO] [stderr]   Downloaded rand_core v0.3.1
[INFO] [stderr]   Downloaded cc v1.0.52
[INFO] [stderr]   Downloaded rand_core v0.4.2
[INFO] [stderr]   Downloaded bit_field v0.10.0
[INFO] [stderr]   Downloaded raw-cpuid v7.0.3
[INFO] [stderr]   Downloaded x86 v0.32.0
[INFO] [stderr]   Downloaded mmap v0.1.1
[INFO] [stderr]   Downloaded rdrand v0.4.0
[INFO] [stderr]   Downloaded libc v0.1.12
[INFO] [stderr]   Downloaded log v0.4.8
[INFO] [stderr]   Downloaded libc v0.2.69
[INFO] [stderr]   Downloaded fuchsia-cprng v0.1.1
[INFO] [stderr]   Downloaded winapi v0.3.8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+575650af7d7ca88602df28e39d27bf3e456c306e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1d5eb2f9bc5edb4ee289ecca2056789ba3dbb77461d91f13c4c60639fd7efcfd
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "1d5eb2f9bc5edb4ee289ecca2056789ba3dbb77461d91f13c4c60639fd7efcfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1d5eb2f9bc5edb4ee289ecca2056789ba3dbb77461d91f13c4c60639fd7efcfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d5eb2f9bc5edb4ee289ecca2056789ba3dbb77461d91f13c4c60639fd7efcfd", kill_on_drop: false }`
[INFO] [stdout] 1d5eb2f9bc5edb4ee289ecca2056789ba3dbb77461d91f13c4c60639fd7efcfd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+575650af7d7ca88602df28e39d27bf3e456c306e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 145ae95d5f02df0386f9984d3f94a8f2bb9416fa3127989012f127b9b572fc78
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "145ae95d5f02df0386f9984d3f94a8f2bb9416fa3127989012f127b9b572fc78", 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]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling cc v1.0.52
[INFO] [stderr]    Compiling x86 v0.32.0
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking remove_dir_all v0.5.2
[INFO] [stderr]     Checking bit_field v0.10.0
[INFO] [stderr]     Checking libc v0.1.12
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]     Checking byteorder v0.5.3
[INFO] [stderr]     Checking bit_field v0.9.0
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]    Compiling raw-cpuid v7.0.3
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking tempdir v0.3.7
[INFO] [stderr]     Checking mmap v0.1.1
[INFO] [stderr]     Checking driverkit v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]    --> src/linux/mem.rs:124:16
[INFO] [stdout]     |
[INFO] [stdout] 124 |             Ok(f) => (),
[INFO] [stdout]     |                ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` 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 10.99s
[INFO] running `Command { std: "docker" "inspect" "145ae95d5f02df0386f9984d3f94a8f2bb9416fa3127989012f127b9b572fc78", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "145ae95d5f02df0386f9984d3f94a8f2bb9416fa3127989012f127b9b572fc78", kill_on_drop: false }`
[INFO] [stdout] 145ae95d5f02df0386f9984d3f94a8f2bb9416fa3127989012f127b9b572fc78