[INFO] fetching crate cargo-xbuild 0.6.0...
[INFO] documenting cargo-xbuild-0.6.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate cargo-xbuild 0.6.0 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate cargo-xbuild 0.6.0 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 cargo-xbuild 0.6.0
[INFO] finished tweaking crates.io crate cargo-xbuild 0.6.0
[INFO] tweaked toml for crates.io crate cargo-xbuild 0.6.0 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate cargo-xbuild 0.6.0 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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] [stdout] 10503fa09fa3bef34e35cb4fc1f05903a5e051fb7466e0d9effe4fc715c298fb
[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" "10503fa09fa3bef34e35cb4fc1f05903a5e051fb7466e0d9effe4fc715c298fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "10503fa09fa3bef34e35cb4fc1f05903a5e051fb7466e0d9effe4fc715c298fb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "10503fa09fa3bef34e35cb4fc1f05903a5e051fb7466e0d9effe4fc715c298fb", kill_on_drop: false }`
[INFO] [stdout] 10503fa09fa3bef34e35cb4fc1f05903a5e051fb7466e0d9effe4fc715c298fb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] [stdout] 032a527032eda941c994120802e33446590cc24a7b933cb88819969c9564affb
[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" "032a527032eda941c994120802e33446590cc24a7b933cb88819969c9564affb", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.67
[INFO] [stderr]    Compiling syn v1.0.14
[INFO] [stderr]     Checking ppv-lite86 v0.2.8
[INFO] [stderr]     Checking itoa v0.4.5
[INFO] [stderr]    Compiling cargo-xbuild v0.6.0 (/opt/rustwide/workdir)
[INFO] [stderr]    Compiling error-chain v0.12.2
[INFO] [stderr]     Checking semver v0.9.0
[INFO] [stderr]     Checking toml v0.5.6
[INFO] [stderr]     Checking serde_json v1.0.48
[INFO] [stderr]     Checking rustc_version v0.2.3
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking tempfile v3.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]     Checking cargo_metadata v0.9.1
[INFO] [stderr]  Documenting cargo-xbuild v0.6.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: Could not document `cargo-xbuild`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name cargo_xc src/bin/cargo-xc.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern xargo_lib=/opt/rustwide/target/debug/deps/libxargo_lib-d4576853572454e0.rmeta --extern cargo_metadata=/opt/rustwide/target/debug/deps/libcargo_metadata-70b31e5abbf42505.rmeta --extern error_chain=/opt/rustwide/target/debug/deps/liberror_chain-b8da2b116c68ab9a.rmeta --extern fs2=/opt/rustwide/target/debug/deps/libfs2-c3fd841d441c83d0.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-f7c1fa64da25474e.rmeta --extern rustc_version=/opt/rustwide/target/debug/deps/librustc_version-b7ba50960296c709.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-ad08fc17c2d1843f.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-8395322736956b0e.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-d7fab5b6c8eecbcc.rmeta --extern tempfile=/opt/rustwide/target/debug/deps/libtempfile-068bebb54c10622c.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-aba93130254390d7.rmeta --extern walkdir=/opt/rustwide/target/debug/deps/libwalkdir-72ead3ebf3ce29a8.rmeta --cap-lints=warn` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "032a527032eda941c994120802e33446590cc24a7b933cb88819969c9564affb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "032a527032eda941c994120802e33446590cc24a7b933cb88819969c9564affb", kill_on_drop: false }`
[INFO] [stdout] 032a527032eda941c994120802e33446590cc24a7b933cb88819969c9564affb