[INFO] fetching crate linkbot 0.0.2...
[INFO] documenting linkbot-0.0.2 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate linkbot 0.0.2 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate linkbot 0.0.2 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 linkbot 0.0.2
[INFO] finished tweaking crates.io crate linkbot 0.0.2
[INFO] tweaked toml for crates.io crate linkbot 0.0.2 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 7824896d235b1b8c39c231c39f1bbbb455ebb85ac7c43abe87d74c08c7b4de37
[INFO] running `Command { std: "docker" "start" "-a" "7824896d235b1b8c39c231c39f1bbbb455ebb85ac7c43abe87d74c08c7b4de37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7824896d235b1b8c39c231c39f1bbbb455ebb85ac7c43abe87d74c08c7b4de37", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7824896d235b1b8c39c231c39f1bbbb455ebb85ac7c43abe87d74c08c7b4de37", kill_on_drop: false }`
[INFO] [stdout] 7824896d235b1b8c39c231c39f1bbbb455ebb85ac7c43abe87d74c08c7b4de37
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 1e707c652856ce01f1fc3aab1f5703239352e82a2edbdf2c02b53fa81cb93eea
[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" "1e707c652856ce01f1fc3aab1f5703239352e82a2edbdf2c02b53fa81cb93eea", kill_on_drop: false }`
[INFO] [stderr]  Documenting linkbot v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `extern` block uses type `std::sync::Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:326:41
[INFO] [stdout]     |
[INFO] [stdout] 326 | ...                   cb: extern fn(i32, i32, i32, *mut Inner),
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(improper_ctypes)]` on by default
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `std::sync::Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:327:47
[INFO] [stdout]     |
[INFO] [stdout] 327 | ...                   userdata: *mut Inner) -> i32;
[INFO] [stdout]     |                                 ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `std::sync::Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:329:42
[INFO] [stdout]     |
[INFO] [stdout] 329 | ...                   cb: Option<extern fn(i32, i32, i32, *mut Inner)>,
[INFO] [stdout]     |                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `extern` block uses type `std::sync::Mutex<u8>`, which is not FFI-safe
[INFO] [stdout]    --> src/lib.rs:330:48
[INFO] [stdout]     |
[INFO] [stdout] 330 | ...                   userdata: *mut Inner) -> i32;
[INFO] [stdout]     |                                 ^^^^^^^^^^ not FFI-safe
[INFO] [stdout]     |
[INFO] [stdout]     = help: consider adding a `#[repr(C)]` or `#[repr(transparent)]` attribute to this struct
[INFO] [stdout]     = note: this struct has unspecified layout
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.25s
[INFO] running `Command { std: "docker" "inspect" "1e707c652856ce01f1fc3aab1f5703239352e82a2edbdf2c02b53fa81cb93eea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e707c652856ce01f1fc3aab1f5703239352e82a2edbdf2c02b53fa81cb93eea", kill_on_drop: false }`
[INFO] [stdout] 1e707c652856ce01f1fc3aab1f5703239352e82a2edbdf2c02b53fa81cb93eea