[INFO] cloning repository https://github.com/yuk1ty/learning-systems-programming-in-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/yuk1ty/learning-systems-programming-in-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyuk1ty%2Flearning-systems-programming-in-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyuk1ty%2Flearning-systems-programming-in-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ecae58c5a18ee0dcd33f602218de0b88e7570950
[INFO] documenting yuk1ty/learning-systems-programming-in-rust against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fyuk1ty%2Flearning-systems-programming-in-rust" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/yuk1ty/learning-systems-programming-in-rust on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-9/source/rust-toolchain
[INFO] started tweaking git repo https://github.com/yuk1ty/learning-systems-programming-in-rust
[INFO] finished tweaking git repo https://github.com/yuk1ty/learning-systems-programming-in-rust
[INFO] tweaked toml for git repo https://github.com/yuk1ty/learning-systems-programming-in-rust written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate git repo https://github.com/yuk1ty/learning-systems-programming-in-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded memmap2 v0.2.2
[INFO] [stderr]   Downloaded zip v0.5.12
[INFO] [stderr]   Downloaded nix v0.21.0
[INFO] [stderr]   Downloaded sysinfo v0.18.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "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] 957df1a4d20e7b1394ff15f8a73c0a398cf007eb574f827f80d69213d7a9bdd8
[INFO] running `Command { std: "docker" "start" "-a" "957df1a4d20e7b1394ff15f8a73c0a398cf007eb574f827f80d69213d7a9bdd8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "957df1a4d20e7b1394ff15f8a73c0a398cf007eb574f827f80d69213d7a9bdd8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "957df1a4d20e7b1394ff15f8a73c0a398cf007eb574f827f80d69213d7a9bdd8", kill_on_drop: false }`
[INFO] [stdout] 957df1a4d20e7b1394ff15f8a73c0a398cf007eb574f827f80d69213d7a9bdd8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "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] 22379fdab83501847e580ff9cd3f2585d1ac21f1d29cabd99b829b7f68daeb49
[INFO] running `Command { std: "docker" "start" "-a" "22379fdab83501847e580ff9cd3f2585d1ac21f1d29cabd99b829b7f68daeb49", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.95
[INFO] [stderr]    Compiling syn v1.0.72
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]     Checking ppv-lite86 v0.2.10
[INFO] [stderr]    Compiling anyhow v1.0.40
[INFO] [stderr]    Compiling httparse v1.4.1
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling serde v1.0.126
[INFO] [stderr]    Compiling sysinfo v0.18.1
[INFO] [stderr]     Checking smallvec v1.6.1
[INFO] [stderr]     Checking bytes v1.0.1
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling tokio v1.6.0
[INFO] [stderr]     Checking crc32fast v1.2.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]     Checking lock_api v0.4.4
[INFO] [stderr]     Checking doc-comment v0.3.3
[INFO] [stderr]     Checking lib v0.1.0 (/opt/rustwide/workdir/lib)
[INFO] [stderr]  Documenting lib v0.1.0 (/opt/rustwide/workdir/lib)
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]    Compiling bzip2-sys v0.1.10+1.0.8
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]  Documenting chapter9 v0.1.0 (/opt/rustwide/workdir/chapter9)
[INFO] [stderr]  Documenting chapter6 v0.1.0 (/opt/rustwide/workdir/chapter6)
[INFO] [stderr]  Documenting chapter12 v0.1.0 (/opt/rustwide/workdir/chapter12)
[INFO] [stderr]  Documenting chapter15 v0.1.0 (/opt/rustwide/workdir/chapter15)
[INFO] [stderr]  Documenting chapter16 v0.1.0 (/opt/rustwide/workdir/chapter16)
[INFO] [stderr]  Documenting appendix v0.1.0 (/opt/rustwide/workdir/appendix)
[INFO] [stderr]  Documenting chapter8 v0.1.0 (/opt/rustwide/workdir/chapter8)
[INFO] [stderr]  Documenting chapter14 v0.1.0 (/opt/rustwide/workdir/chapter14)
[INFO] [stderr]  Documenting chapter5 v0.1.0 (/opt/rustwide/workdir/chapter5)
[INFO] [stderr]  Documenting chapter1 v0.1.0 (/opt/rustwide/workdir/chapter1)
[INFO] [stderr]  Documenting chapter17 v0.1.0 (/opt/rustwide/workdir/chapter17)
[INFO] [stderr]  Documenting chapter13 v0.1.0 (/opt/rustwide/workdir/chapter13)
[INFO] [stderr] error: could not document `chapter6`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name 6_6 chapter6/src/6_6/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=773f8690d061412a -L dependency=/opt/rustwide/target/debug/deps --extern lib=/opt/rustwide/target/debug/deps/liblib-46bdb8aa9444d905.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not document `appendix`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name appendix appendix/src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=f9050b60996cf80f -L dependency=/opt/rustwide/target/debug/deps --extern lib=/opt/rustwide/target/debug/deps/liblib-46bdb8aa9444d905.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] running `Command { std: "docker" "inspect" "22379fdab83501847e580ff9cd3f2585d1ac21f1d29cabd99b829b7f68daeb49", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22379fdab83501847e580ff9cd3f2585d1ac21f1d29cabd99b829b7f68daeb49", kill_on_drop: false }`
[INFO] [stdout] 22379fdab83501847e580ff9cd3f2585d1ac21f1d29cabd99b829b7f68daeb49