[INFO] cloning repository https://github.com/earaujoassis/knock-knock
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/earaujoassis/knock-knock" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fearaujoassis%2Fknock-knock", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fearaujoassis%2Fknock-knock'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1b3831646546bc782ec2582384ab568ac6e67194
[INFO] documenting earaujoassis/knock-knock against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fearaujoassis%2Fknock-knock" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/earaujoassis/knock-knock on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/earaujoassis/knock-knock
[INFO] finished tweaking git repo https://github.com/earaujoassis/knock-knock
[INFO] tweaked toml for git repo https://github.com/earaujoassis/knock-knock written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/earaujoassis/knock-knock already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 908119b4bb77e27d3279ac6d6e93fcb106f9d0b7aa600d425c39b43c8c551863
[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" "908119b4bb77e27d3279ac6d6e93fcb106f9d0b7aa600d425c39b43c8c551863", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "908119b4bb77e27d3279ac6d6e93fcb106f9d0b7aa600d425c39b43c8c551863", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "908119b4bb77e27d3279ac6d6e93fcb106f9d0b7aa600d425c39b43c8c551863", kill_on_drop: false }`
[INFO] [stdout] 908119b4bb77e27d3279ac6d6e93fcb106f9d0b7aa600d425c39b43c8c551863
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f6b2b19ef9c3bc6b2a0a065b2d6c11b8f57eaae93a6f1dcf06470b298d1116b8
[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" "f6b2b19ef9c3bc6b2a0a065b2d6c11b8f57eaae93a6f1dcf06470b298d1116b8", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.87
[INFO] [stderr]    Compiling encoding_index_tests v0.1.4
[INFO] [stderr]    Compiling antidote v1.0.0
[INFO] [stderr]     Checking arc-swap v0.3.7
[INFO] [stderr]    Compiling encoding_rs v0.8.16
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling libsqlite3-sys v0.12.0
[INFO] [stderr]    Compiling mysqlclient-sys v0.2.3
[INFO] [stderr]    Compiling brotli-sys v0.3.2
[INFO] [stderr]    Compiling v_escape v0.3.2
[INFO] [stderr]    Compiling ring v0.13.5
[INFO] [stderr]    Compiling v_htmlescape v0.3.2
[INFO] [stderr]    Compiling actix-web v0.7.18
[INFO] [stderr]     Checking lru-cache v0.1.1
[INFO] [stderr]     Checking want v0.0.6
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling smallvec v0.6.8
[INFO] [stderr]     Checking r2d2 v0.8.3
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking socket2 v0.3.8
[INFO] [stderr]     Checking hostname v0.1.5
[INFO] [stderr]     Checking isatty v0.1.9
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]     Checking term v0.5.1
[INFO] [stderr]    Compiling memchr v2.1.3
[INFO] [stderr]     Checking openssl-sys v0.9.40
[INFO] [stderr]     Checking miniz-sys v0.1.11
[INFO] [stderr]    Compiling encoding-index-simpchinese v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-singlebyte v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-korean v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-japanese v1.20141219.5
[INFO] [stderr]    Compiling encoding-index-tradchinese v1.20141219.5
[INFO] [stderr]    Compiling scheduled-thread-pool v0.2.0
[INFO] [stderr]     Checking libflate v0.1.19
[INFO] [stderr]     Checking mio v0.6.16
[INFO] [stderr]     Checking signal-hook v0.1.7
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]    Compiling unicode-normalization v0.1.8
[INFO] [stderr]     Checking resolv-conf v0.6.2
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]     Checking tokio-io v0.1.11
[INFO] [stderr]     Checking flate2 v1.0.6
[INFO] [stderr]    Compiling nom v4.2.0
[INFO] [stderr]     Checking rand_pcg v0.1.1
[INFO] [stderr]    Compiling serde_derive v1.0.87
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]    Compiling diesel_derives v1.4.0
[INFO] [stderr]    Compiling actix_derive v0.3.2
[INFO] [stderr]     Checking openssl v0.10.16
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]    Compiling encoding v0.2.33
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]     Checking h2 v0.1.16
[INFO] [stderr]    Compiling idna v0.1.5
[INFO] [stderr]    Compiling v_escape_derive v0.2.1
[INFO] [stderr]     Checking hyper v0.10.15
[INFO] [stderr]     Checking backtrace v0.3.13
[INFO] [stderr]    Compiling phf_generator v0.7.24
[INFO] [stderr]     Checking parking_lot_core v0.4.0
[INFO] [stderr] error: could not compile `syn`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name syn /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/syn-0.14.9/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="clone-impls"' --cfg 'feature="default"' --cfg 'feature="derive"' --cfg 'feature="full"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="proc-macro"' --cfg 'feature="quote"' -C metadata=cf7496ff2f1a59ae -C extra-filename=-cf7496ff2f1a59ae --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-8a61732e01f8c220.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-4eb547d99216c82d.rmeta --extern unicode_xid=/opt/rustwide/target/debug/deps/libunicode_xid-f4af8e7ee48fb608.rmeta --cap-lints allow` (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" "f6b2b19ef9c3bc6b2a0a065b2d6c11b8f57eaae93a6f1dcf06470b298d1116b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f6b2b19ef9c3bc6b2a0a065b2d6c11b8f57eaae93a6f1dcf06470b298d1116b8", kill_on_drop: false }`
[INFO] [stdout] f6b2b19ef9c3bc6b2a0a065b2d6c11b8f57eaae93a6f1dcf06470b298d1116b8