[INFO] fetching crate buildkit-frontend 0.3.0...
[INFO] documenting buildkit-frontend-0.3.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate buildkit-frontend 0.3.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate buildkit-frontend 0.3.0 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate buildkit-frontend 0.3.0
[INFO] finished tweaking crates.io crate buildkit-frontend 0.3.0
[INFO] tweaked toml for crates.io crate buildkit-frontend 0.3.0 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate buildkit-frontend 0.3.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "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] 21dce548c26ca7a4aa827b6b4a3c73abd8f5a77a7682b6dcd69992b1445c0fe7
[INFO] running `Command { std: "docker" "start" "-a" "21dce548c26ca7a4aa827b6b4a3c73abd8f5a77a7682b6dcd69992b1445c0fe7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "21dce548c26ca7a4aa827b6b4a3c73abd8f5a77a7682b6dcd69992b1445c0fe7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "21dce548c26ca7a4aa827b6b4a3c73abd8f5a77a7682b6dcd69992b1445c0fe7", kill_on_drop: false }`
[INFO] [stdout] 21dce548c26ca7a4aa827b6b4a3c73abd8f5a77a7682b6dcd69992b1445c0fe7
[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" "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" "+1.46.0" "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] cef7394eae5db105417829eaabd505bc7fc25f8f4515124be324dd503526119d
[INFO] running `Command { std: "docker" "start" "-a" "cef7394eae5db105417829eaabd505bc7fc25f8f4515124be324dd503526119d", kill_on_drop: false }`
[INFO] [stderr]    Compiling either v1.5.3
[INFO] [stderr]     Checking tower-layer v0.3.0
[INFO] [stderr]    Compiling bytes v0.5.4
[INFO] [stderr]    Compiling fixedbitset v0.2.0
[INFO] [stderr]    Compiling remove_dir_all v0.5.2
[INFO] [stderr]    Compiling multimap v0.8.0
[INFO] [stderr]     Checking byte-tools v0.3.1
[INFO] [stderr]     Checking opaque-debug v0.2.3
[INFO] [stderr]     Checking fake-simd v0.1.2
[INFO] [stderr]     Checking tracing-core v0.1.10
[INFO] [stderr]    Compiling c2-chacha v0.2.3
[INFO] [stderr]    Compiling anyhow v1.0.26
[INFO] [stderr]    Compiling libc v0.2.67
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking generic-array v0.12.3
[INFO] [stderr]    Compiling indexmap v1.3.2
[INFO] [stderr]     Checking mio v0.6.21
[INFO] [stderr]    Compiling pin-project-internal v0.4.8
[INFO] [stderr]    Compiling tracing-attributes v0.1.7
[INFO] [stderr]    Compiling async-stream-impl v0.2.1
[INFO] [stderr]    Compiling async-trait v0.1.24
[INFO] [stderr]     Checking block-padding v0.1.5
[INFO] [stderr]    Compiling futures-macro v0.3.4
[INFO] [stderr]    Compiling itertools v0.8.2
[INFO] [stderr]    Compiling failure_derive v0.1.6
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking chrono v0.4.10
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]    Compiling petgraph v0.5.0
[INFO] [stderr]     Checking rand_pcg v0.2.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking sha2 v0.8.1
[INFO] [stderr]    Compiling which v3.1.0
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking tokio v0.2.13
[INFO] [stderr]    Compiling prost-build v0.6.1
[INFO] [stderr]    Compiling prost-derive v0.6.1
[INFO] [stderr]     Checking failure v0.1.6
[INFO] [stderr]     Checking async-stream v0.2.1
[INFO] [stderr]     Checking futures-util v0.3.4
[INFO] [stderr]    Compiling tempfile v3.1.0
[INFO] [stderr]     Checking tracing v0.1.13
[INFO] [stderr]     Checking pin-project v0.4.8
[INFO] [stderr]     Checking tower-discover v0.3.0
[INFO] [stderr]     Checking tower-load-shed v0.3.0
[INFO] [stderr]     Checking tracing-futures v0.2.3
[INFO] [stderr]     Checking tokio-util v0.2.0
[INFO] [stderr]     Checking tower-retry v0.3.0
[INFO] [stderr]     Checking tower-make v0.3.0
[INFO] [stderr]     Checking tower-limit v0.3.0
[INFO] [stderr]     Checking tower-timeout v0.3.0
[INFO] [stderr]     Checking tower-load v0.3.0
[INFO] [stderr]     Checking tower-buffer v0.3.0
[INFO] [stderr]    Compiling prost v0.6.1
[INFO] [stderr]     Checking tower-util v0.3.0
[INFO] [stderr]     Checking h2 v0.2.2
[INFO] [stderr]     Checking tower-ready-cache v0.3.1
[INFO] [stderr]     Checking futures-executor v0.3.4
[INFO] [stderr]     Checking prost-types v0.6.1
[INFO] [stderr]     Checking tower-balance v0.3.0
[INFO] [stderr]     Checking futures v0.3.4
[INFO] [stderr]     Checking tower v0.3.1
[INFO] [stderr]     Checking hyper v0.13.3
[INFO] [stderr]    Compiling tonic-build v0.1.1
[INFO] [stderr]    Compiling buildkit-proto v0.2.0
[INFO] [stderr]     Checking tonic v0.1.1
[INFO] [stderr]     Checking buildkit-llb v0.2.0
[INFO] [stderr]  Documenting buildkit-frontend v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 23s
[INFO] running `Command { std: "docker" "inspect" "cef7394eae5db105417829eaabd505bc7fc25f8f4515124be324dd503526119d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cef7394eae5db105417829eaabd505bc7fc25f8f4515124be324dd503526119d", kill_on_drop: false }`
[INFO] [stdout] cef7394eae5db105417829eaabd505bc7fc25f8f4515124be324dd503526119d