[INFO] fetching crate serde_stacker 0.1.4...
[INFO] building serde_stacker-0.1.4 against master#d5c88c22807925c189328ef9d923c5d2b11a95b8 for pr-87066-3
[INFO] extracting crate serde_stacker 0.1.4 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate serde_stacker 0.1.4 on toolchain d5c88c22807925c189328ef9d923c5d2b11a95b8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d5c88c22807925c189328ef9d923c5d2b11a95b8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate serde_stacker 0.1.4
[INFO] finished tweaking crates.io crate serde_stacker 0.1.4
[INFO] tweaked toml for crates.io crate serde_stacker 0.1.4 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d5c88c22807925c189328ef9d923c5d2b11a95b8" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+d5c88c22807925c189328ef9d923c5d2b11a95b8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d5c88c22807925c189328ef9d923c5d2b11a95b8" "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] 7af57ebf8f5045f70795e6e3f2bb969587d65b00d493b2ca8f98b0ae0cd232e6
[INFO] running `Command { std: "docker" "start" "-a" "7af57ebf8f5045f70795e6e3f2bb969587d65b00d493b2ca8f98b0ae0cd232e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7af57ebf8f5045f70795e6e3f2bb969587d65b00d493b2ca8f98b0ae0cd232e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7af57ebf8f5045f70795e6e3f2bb969587d65b00d493b2ca8f98b0ae0cd232e6", kill_on_drop: false }`
[INFO] [stdout] 7af57ebf8f5045f70795e6e3f2bb969587d65b00d493b2ca8f98b0ae0cd232e6
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d5c88c22807925c189328ef9d923c5d2b11a95b8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3e9fee08c75d8941a4ae30fc0ad298e94211d3add6224a0e2519ad9d7f962369
[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" "3e9fee08c75d8941a4ae30fc0ad298e94211d3add6224a0e2519ad9d7f962369", kill_on_drop: false }`
[INFO] [stderr]    Compiling psm v0.1.14
[INFO] [stderr]    Compiling stacker v0.1.14
[INFO] [stderr]    Compiling serde_stacker v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.72s
[INFO] running `Command { std: "docker" "inspect" "3e9fee08c75d8941a4ae30fc0ad298e94211d3add6224a0e2519ad9d7f962369", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3e9fee08c75d8941a4ae30fc0ad298e94211d3add6224a0e2519ad9d7f962369", kill_on_drop: false }`
[INFO] [stdout] 3e9fee08c75d8941a4ae30fc0ad298e94211d3add6224a0e2519ad9d7f962369
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+d5c88c22807925c189328ef9d923c5d2b11a95b8" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6fc204eb870b3ba7c6e0db268b919e9507d9dcedd0588f6489067203e3600c61
[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" "6fc204eb870b3ba7c6e0db268b919e9507d9dcedd0588f6489067203e3600c61", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]    Compiling serde_stacker v0.1.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 4.15s
[INFO] running `Command { std: "docker" "inspect" "6fc204eb870b3ba7c6e0db268b919e9507d9dcedd0588f6489067203e3600c61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6fc204eb870b3ba7c6e0db268b919e9507d9dcedd0588f6489067203e3600c61", kill_on_drop: false }`
[INFO] [stdout] 6fc204eb870b3ba7c6e0db268b919e9507d9dcedd0588f6489067203e3600c61