[INFO] cloning repository https://github.com/rikusen0335/serenity-test-bot
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rikusen0335/serenity-test-bot" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frikusen0335%2Fserenity-test-bot", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frikusen0335%2Fserenity-test-bot'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 2975c5c9be2223a0b924898bece7ba43c50ee209
[INFO] documenting rikusen0335/serenity-test-bot against beta-2021-09-08 for beta-1.56-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frikusen0335%2Fserenity-test-bot" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/rikusen0335/serenity-test-bot on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rikusen0335/serenity-test-bot
[INFO] finished tweaking git repo https://github.com/rikusen0335/serenity-test-bot
[INFO] tweaked toml for git repo https://github.com/rikusen0335/serenity-test-bot written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/rikusen0335/serenity-test-bot already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--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-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "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] 719d530e069dc278ae154b24ee4e74967c93d4bedd58203f0b7d0804fc4d5ba6
[INFO] running `Command { std: "docker" "start" "-a" "719d530e069dc278ae154b24ee4e74967c93d4bedd58203f0b7d0804fc4d5ba6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "719d530e069dc278ae154b24ee4e74967c93d4bedd58203f0b7d0804fc4d5ba6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "719d530e069dc278ae154b24ee4e74967c93d4bedd58203f0b7d0804fc4d5ba6", kill_on_drop: false }`
[INFO] [stdout] 719d530e069dc278ae154b24ee4e74967c93d4bedd58203f0b7d0804fc4d5ba6
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-09-08" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7235a19c4102ab9d4293480730c41500c136ae55d793bdc28de7bfa7f9f8cf8c
[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" "7235a19c4102ab9d4293480730c41500c136ae55d793bdc28de7bfa7f9f8cf8c", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking zeroize v1.3.0
[INFO] [stderr]    Compiling serenity v0.10.9
[INFO] [stderr]    Compiling songbird v0.2.0
[INFO] [stderr]     Checking typemap_rev v0.1.5
[INFO] [stderr]     Checking uwl v0.6.0
[INFO] [stderr]     Checking spin_sleep v1.0.0
[INFO] [stderr]    Compiling tokio v1.10.0
[INFO] [stderr]    Compiling futures-util v0.3.16
[INFO] [stderr]    Compiling ring v0.16.20
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]     Checking spinning_top v0.2.4
[INFO] [stderr]     Checking parking_lot_core v0.8.3
[INFO] [stderr]     Checking signal-hook-registry v1.4.0
[INFO] [stderr]     Checking getrandom v0.2.3
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking socket2 v0.4.1
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking mio v0.7.13
[INFO] [stderr]     Checking futures-channel v0.3.16
[INFO] [stderr]    Compiling audiopus_sys v0.1.8
[INFO] [stderr]     Checking openssl-sys v0.9.66
[INFO] [stderr]     Checking symphonia-core v0.2.0
[INFO] [stderr]     Checking dashmap v4.0.2
[INFO] [stderr]     Checking flate2 v1.0.20
[INFO] [stderr]     Checking universal-hash v0.4.1
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking nanorand v0.6.1
[INFO] [stderr]     Checking uuid v0.8.2
[INFO] [stderr]    Compiling tokio-macros v1.3.0
[INFO] [stderr]    Compiling futures-macro v0.3.16
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]    Compiling tracing-attributes v0.1.15
[INFO] [stderr]    Compiling pin-project-internal v1.0.8
[INFO] [stderr]    Compiling thiserror-impl v1.0.26
[INFO] [stderr]    Compiling async-trait v0.1.51
[INFO] [stderr]    Compiling command_attr v0.3.7
[INFO] [stderr]    Compiling serde_repr v0.1.7
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]     Checking salsa20 v0.8.1
[INFO] [stderr]    Compiling pnet_macros v0.28.0
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking poly1305 v0.7.1
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking aead v0.4.2
[INFO] [stderr]     Checking openssl v0.10.36
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.8.4
[INFO] [stderr]     Checking xsalsa20poly1305 v0.7.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking audiopus v0.2.0
[INFO] [stderr]     Checking tungstenite v0.11.1
[INFO] [stderr] error: could not compile `serde_derive`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name serde_derive /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/serde_derive-1.0.127/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type proc-macro --emit=dep-info,link -C prefer-dynamic -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' -C metadata=ede82d19202a529f -C extra-filename=-ede82d19202a529f --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-7fd25c3770c30c44.rlib --extern quote=/opt/rustwide/target/debug/deps/libquote-4f2ff32975dd8b04.rlib --extern syn=/opt/rustwide/target/debug/deps/libsyn-3c00b959750c9924.rlib --extern proc_macro --cap-lints allow --cfg underscore_consts` (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" "7235a19c4102ab9d4293480730c41500c136ae55d793bdc28de7bfa7f9f8cf8c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7235a19c4102ab9d4293480730c41500c136ae55d793bdc28de7bfa7f9f8cf8c", kill_on_drop: false }`
[INFO] [stdout] 7235a19c4102ab9d4293480730c41500c136ae55d793bdc28de7bfa7f9f8cf8c