[INFO] fetching crate driverkit 0.3.0...
[INFO] checking driverkit-0.3.0 against try#f47dd4da3ae8c32c9e65d307bfe640b143e674df for pr-77526
[INFO] extracting crate driverkit 0.3.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate driverkit 0.3.0 on toolchain f47dd4da3ae8c32c9e65d307bfe640b143e674df
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "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-4/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" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rand_core v0.3.1
[INFO] [stderr]   Downloaded cc v1.0.52
[INFO] [stderr]   Downloaded rdrand v0.4.0
[INFO] [stderr]   Downloaded libc v0.1.12
[INFO] [stderr]   Downloaded rand_core v0.4.2
[INFO] [stderr]   Downloaded rand v0.4.6
[INFO] [stderr]   Downloaded raw-cpuid v7.0.3
[INFO] [stderr]   Downloaded tempdir v0.3.7
[INFO] [stderr]   Downloaded x86 v0.32.0
[INFO] [stderr]   Downloaded fuchsia-cprng v0.1.1
[INFO] [stderr]   Downloaded bit_field v0.9.0
[INFO] [stderr]   Downloaded mmap v0.1.1
[INFO] [stderr]   Downloaded libc v0.2.69
[INFO] [stderr]   Downloaded bit_field v0.10.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] cca72f23ce202bc786b5f979ba7e8947f2b5a793c159f78538a5e206798fb390
[INFO] running `Command { std: "docker" "start" "-a" "cca72f23ce202bc786b5f979ba7e8947f2b5a793c159f78538a5e206798fb390", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cca72f23ce202bc786b5f979ba7e8947f2b5a793c159f78538a5e206798fb390", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cca72f23ce202bc786b5f979ba7e8947f2b5a793c159f78538a5e206798fb390", kill_on_drop: false }`
[INFO] [stdout] cca72f23ce202bc786b5f979ba7e8947f2b5a793c159f78538a5e206798fb390
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+f47dd4da3ae8c32c9e65d307bfe640b143e674df" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b2b9ed0cbc6a7075afd59720552f74881ba091ce24d03dadb9411afe7e5fde28
[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" "b2b9ed0cbc6a7075afd59720552f74881ba091ce24d03dadb9411afe7e5fde28", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling cc v1.0.52
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling x86 v0.32.0
[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 bit_field v0.9.0
[INFO] [stderr]     Checking matches v0.1.8
[INFO] [stderr]     Checking bitflags v1.2.1
[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 8.45s
[INFO] running `Command { std: "docker" "inspect" "b2b9ed0cbc6a7075afd59720552f74881ba091ce24d03dadb9411afe7e5fde28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2b9ed0cbc6a7075afd59720552f74881ba091ce24d03dadb9411afe7e5fde28", kill_on_drop: false }`
[INFO] [stdout] b2b9ed0cbc6a7075afd59720552f74881ba091ce24d03dadb9411afe7e5fde28