[INFO] fetching crate serial_test 0.5.0...
[INFO] checking serial_test-0.5.0 against beta for pr-78714
[INFO] extracting crate serial_test 0.5.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate serial_test 0.5.0 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate serial_test 0.5.0
[INFO] finished tweaking crates.io crate serial_test 0.5.0
[INFO] tweaked toml for crates.io crate serial_test 0.5.0 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5a1deec0cbd7333408483564434ebc6d48805ff10bef7e6fe29251a16bf3a47d
[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" "5a1deec0cbd7333408483564434ebc6d48805ff10bef7e6fe29251a16bf3a47d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5a1deec0cbd7333408483564434ebc6d48805ff10bef7e6fe29251a16bf3a47d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5a1deec0cbd7333408483564434ebc6d48805ff10bef7e6fe29251a16bf3a47d", kill_on_drop: false }`
[INFO] [stdout] 5a1deec0cbd7333408483564434ebc6d48805ff10bef7e6fe29251a16bf3a47d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+beta" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] 71f6972f1d3d3887517b5a95225a5a27e687b3e3f501d5098e258efc8d50efa5
[INFO] running `Command { std: "docker" "start" "-a" "71f6972f1d3d3887517b5a95225a5a27e687b3e3f501d5098e258efc8d50efa5", kill_on_drop: false }`
[INFO] [stderr]    Compiling serial_test_derive v0.5.0
[INFO] [stderr]     Checking serial_test v0.5.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.94s
[INFO] running `Command { std: "docker" "inspect" "71f6972f1d3d3887517b5a95225a5a27e687b3e3f501d5098e258efc8d50efa5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71f6972f1d3d3887517b5a95225a5a27e687b3e3f501d5098e258efc8d50efa5", kill_on_drop: false }`
[INFO] [stdout] 71f6972f1d3d3887517b5a95225a5a27e687b3e3f501d5098e258efc8d50efa5