[INFO] fetching crate unsafe-io 0.9.1...
[INFO] testing unsafe-io-0.9.1 against beta-2021-08-22 for beta-1.55-2
[INFO] extracting crate unsafe-io 0.9.1 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate unsafe-io 0.9.1 on toolchain beta-2021-08-22
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-22" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate unsafe-io 0.9.1
[INFO] finished tweaking crates.io crate unsafe-io 0.9.1
[INFO] tweaked toml for crates.io crate unsafe-io 0.9.1 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate unsafe-io 0.9.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-22" "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-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-22" "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] a8906e2656359886461cb33e32e8b1ecc3e6fb0fd5e8599cbb1262b4d6b7f629
[INFO] running `Command { std: "docker" "start" "-a" "a8906e2656359886461cb33e32e8b1ecc3e6fb0fd5e8599cbb1262b4d6b7f629", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a8906e2656359886461cb33e32e8b1ecc3e6fb0fd5e8599cbb1262b4d6b7f629", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a8906e2656359886461cb33e32e8b1ecc3e6fb0fd5e8599cbb1262b4d6b7f629", kill_on_drop: false }`
[INFO] [stdout] a8906e2656359886461cb33e32e8b1ecc3e6fb0fd5e8599cbb1262b4d6b7f629
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-22" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5439fbb38e8b6e702a78e6f88ff0bbdd66255a91b4541ab1a0a62adaebf13895
[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" "5439fbb38e8b6e702a78e6f88ff0bbdd66255a91b4541ab1a0a62adaebf13895", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver v1.0.4
[INFO] [stderr]    Compiling rustc_version v0.4.0
[INFO] [stderr]    Compiling io-lifetimes v0.3.0
[INFO] [stderr]    Compiling unsafe-io v0.9.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.98s
[INFO] running `Command { std: "docker" "inspect" "5439fbb38e8b6e702a78e6f88ff0bbdd66255a91b4541ab1a0a62adaebf13895", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5439fbb38e8b6e702a78e6f88ff0bbdd66255a91b4541ab1a0a62adaebf13895", kill_on_drop: false }`
[INFO] [stdout] 5439fbb38e8b6e702a78e6f88ff0bbdd66255a91b4541ab1a0a62adaebf13895
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-22" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9246d0f2f4630bc78c35dbf85e12bf501fdee6b97fe12a32074d8593233e8479
[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" "9246d0f2f4630bc78c35dbf85e12bf501fdee6b97fe12a32074d8593233e8479", kill_on_drop: false }`
[INFO] [stderr] error: failed to create directory `/opt/rustwide/target/debug/tmp`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   File exists (os error 17)
[INFO] running `Command { std: "docker" "inspect" "9246d0f2f4630bc78c35dbf85e12bf501fdee6b97fe12a32074d8593233e8479", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9246d0f2f4630bc78c35dbf85e12bf501fdee6b97fe12a32074d8593233e8479", kill_on_drop: false }`
[INFO] [stdout] 9246d0f2f4630bc78c35dbf85e12bf501fdee6b97fe12a32074d8593233e8479