[INFO] fetching crate png 0.16.7...
[INFO] documenting png-0.16.7 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate png 0.16.7 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate png 0.16.7 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 png 0.16.7
[INFO] finished tweaking crates.io crate png 0.16.7
[INFO] tweaked toml for crates.io crate png 0.16.7 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate crates.io crate png 0.16.7 already has a lockfile, it will not be regenerated
[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-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" "+1.47.0" "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] 009b32bb91ca64f7fe7e33ab8befb1ae8b5c773dbf9a86c270207e6895b73762
[INFO] running `Command { std: "docker" "start" "-a" "009b32bb91ca64f7fe7e33ab8befb1ae8b5c773dbf9a86c270207e6895b73762", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "009b32bb91ca64f7fe7e33ab8befb1ae8b5c773dbf9a86c270207e6895b73762", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "009b32bb91ca64f7fe7e33ab8befb1ae8b5c773dbf9a86c270207e6895b73762", kill_on_drop: false }`
[INFO] [stdout] 009b32bb91ca64f7fe7e33ab8befb1ae8b5c773dbf9a86c270207e6895b73762
[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" "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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 1641b4991543b8bd3cf7b0d8c9502417db07961cf721ef91b0d1b87f28c33dbe
[INFO] running `Command { std: "docker" "start" "-a" "1641b4991543b8bd3cf7b0d8c9502417db07961cf721ef91b0d1b87f28c33dbe", kill_on_drop: false }`
[INFO] [stderr]     Checking miniz_oxide v0.3.7
[INFO] [stderr]     Checking deflate v0.8.4
[INFO] [stderr]  Documenting png v0.16.7 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.21s
[INFO] running `Command { std: "docker" "inspect" "1641b4991543b8bd3cf7b0d8c9502417db07961cf721ef91b0d1b87f28c33dbe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1641b4991543b8bd3cf7b0d8c9502417db07961cf721ef91b0d1b87f28c33dbe", kill_on_drop: false }`
[INFO] [stdout] 1641b4991543b8bd3cf7b0d8c9502417db07961cf721ef91b0d1b87f28c33dbe
