[INFO] fetching crate libpng-sys 1.1.8...
[INFO] documenting libpng-sys-1.1.8 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate libpng-sys 1.1.8 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate libpng-sys 1.1.8 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate libpng-sys 1.1.8
[INFO] finished tweaking crates.io crate libpng-sys 1.1.8
[INFO] tweaked toml for crates.io crate libpng-sys 1.1.8 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 13d94a02b0c40b9934691601da4e5f1092ccc8184fd54f3e9180e4e614b8e157
[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" "13d94a02b0c40b9934691601da4e5f1092ccc8184fd54f3e9180e4e614b8e157", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "13d94a02b0c40b9934691601da4e5f1092ccc8184fd54f3e9180e4e614b8e157", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "13d94a02b0c40b9934691601da4e5f1092ccc8184fd54f3e9180e4e614b8e157", kill_on_drop: false }`
[INFO] [stdout] 13d94a02b0c40b9934691601da4e5f1092ccc8184fd54f3e9180e4e614b8e157
[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" "RUSTDOCFLAGS=--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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 14839c6af15f357fe03bafdcb0d176356e33c3199c632070fa2385a347be23db
[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" "14839c6af15f357fe03bafdcb0d176356e33c3199c632070fa2385a347be23db", kill_on_drop: false }`
[INFO] [stderr]    Compiling dunce v1.0.1
[INFO] [stderr]    Compiling libpng-sys v1.1.8 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting libpng-sys v1.1.8 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.58s
[INFO] running `Command { std: "docker" "inspect" "14839c6af15f357fe03bafdcb0d176356e33c3199c632070fa2385a347be23db", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14839c6af15f357fe03bafdcb0d176356e33c3199c632070fa2385a347be23db", kill_on_drop: false }`
[INFO] [stdout] 14839c6af15f357fe03bafdcb0d176356e33c3199c632070fa2385a347be23db
