[INFO] cloning repository https://github.com/ryosukeeeee/rust_rdbms_scratch
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ryosukeeeee/rust_rdbms_scratch" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fryosukeeeee%2Frust_rdbms_scratch", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fryosukeeeee%2Frust_rdbms_scratch'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 98e53fe3065b2dd8f2f595b369e2ac25e9c3237c
[INFO] checking ryosukeeeee/rust_rdbms_scratch against master#0ef0dd24510b52da980889546fcd15254dc56a23 for pr-126452
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fryosukeeeee%2Frust_rdbms_scratch" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ryosukeeeee/rust_rdbms_scratch on toolchain 0ef0dd24510b52da980889546fcd15254dc56a23
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0ef0dd24510b52da980889546fcd15254dc56a23" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ryosukeeeee/rust_rdbms_scratch
[INFO] finished tweaking git repo https://github.com/ryosukeeeee/rust_rdbms_scratch
[INFO] tweaked toml for git repo https://github.com/ryosukeeeee/rust_rdbms_scratch written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/ryosukeeeee/rust_rdbms_scratch already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0ef0dd24510b52da980889546fcd15254dc56a23" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking ryosukeeeee/rust_rdbms_scratch against try#d9cbfeb054d7bd02cf942e6d32c1c0a91f042ce9 for pr-126452
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fryosukeeeee%2Frust_rdbms_scratch" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ryosukeeeee/rust_rdbms_scratch on toolchain d9cbfeb054d7bd02cf942e6d32c1c0a91f042ce9
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d9cbfeb054d7bd02cf942e6d32c1c0a91f042ce9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ryosukeeeee/rust_rdbms_scratch
[INFO] finished tweaking git repo https://github.com/ryosukeeeee/rust_rdbms_scratch
[INFO] tweaked toml for git repo https://github.com/ryosukeeeee/rust_rdbms_scratch written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/ryosukeeeee/rust_rdbms_scratch already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+d9cbfeb054d7bd02cf942e6d32c1c0a91f042ce9" "fetch" "--manifest-path" "Cargo.toml", 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+d9cbfeb054d7bd02cf942e6d32c1c0a91f042ce9" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f76e78f4e7efdd780e63e0a3552de43ac91417ceb07b3210b5a6afe0b473bdb7
[INFO] running `Command { std: "docker" "start" "-a" "f76e78f4e7efdd780e63e0a3552de43ac91417ceb07b3210b5a6afe0b473bdb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f76e78f4e7efdd780e63e0a3552de43ac91417ceb07b3210b5a6afe0b473bdb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f76e78f4e7efdd780e63e0a3552de43ac91417ceb07b3210b5a6afe0b473bdb7", kill_on_drop: false }`
[INFO] [stdout] f76e78f4e7efdd780e63e0a3552de43ac91417ceb07b3210b5a6afe0b473bdb7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/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" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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:dff56e7819e73ed36160586b3445e93eb0be776c16704aeeded9c3fb668b2384" "/opt/rustwide/cargo-home/bin/cargo" "+d9cbfeb054d7bd02cf942e6d32c1c0a91f042ce9" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 550feabd4482c187ce42b97ba74f06cd7dda48e1f090f7a7f6e1b86fb28fee0e
[INFO] running `Command { std: "docker" "start" "-a" "550feabd4482c187ce42b97ba74f06cd7dda48e1f090f7a7f6e1b86fb28fee0e", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.26
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.71
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]    Compiling thiserror-impl v1.0.24
[INFO] [stderr]     Checking thiserror v1.0.24
[INFO] [stderr]     Checking rust_rdbms_practice v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `usage_count` and `buffer` are never read
[INFO] [stdout]   --> src/buffer.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub struct Frame {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 26 |     usage_count: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 27 |     buffer: Rc<Buffer>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BufferPool` is never constructed
[INFO] [stdout]   --> src/buffer.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct BufferPool {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `size`, `evict`, and `increment_id` are never used
[INFO] [stdout]   --> src/buffer.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | impl BufferPool {
[INFO] [stdout]    | --------------- methods in this implementation
[INFO] [stdout] 35 |     fn size(&self) -> usize {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 39 |     fn evict(&mut self) -> Option<BufferId> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 65 |     fn increment_id(&self, buffer_id: BufferId) -> BufferId {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BufferPoolManager` is never constructed
[INFO] [stdout]   --> src/buffer.rs:84:12
[INFO] [stdout]    |
[INFO] [stdout] 84 | pub struct BufferPoolManager {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `fetch_page` is never used
[INFO] [stdout]   --> src/buffer.rs:91:8
[INFO] [stdout]    |
[INFO] [stdout] 90 | impl BufferPoolManager {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] 91 |     fn fetch_page(&mut self, page_id: PageId) -> Result<Rc<Buffer>, Error> {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `usage_count` and `buffer` are never read
[INFO] [stdout]   --> src/buffer.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 25 | pub struct Frame {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 26 |     usage_count: u64,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 27 |     buffer: Rc<Buffer>,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BufferPool` is never constructed
[INFO] [stdout]   --> src/buffer.rs:29:12
[INFO] [stdout]    |
[INFO] [stdout] 29 | pub struct BufferPool {
[INFO] [stdout]    |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `size`, `evict`, and `increment_id` are never used
[INFO] [stdout]   --> src/buffer.rs:35:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | impl BufferPool {
[INFO] [stdout]    | --------------- methods in this implementation
[INFO] [stdout] 35 |     fn size(&self) -> usize {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 39 |     fn evict(&mut self) -> Option<BufferId> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 65 |     fn increment_id(&self, buffer_id: BufferId) -> BufferId {
[INFO] [stdout]    |        ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BufferPoolManager` is never constructed
[INFO] [stdout]   --> src/buffer.rs:84:12
[INFO] [stdout]    |
[INFO] [stdout] 84 | pub struct BufferPoolManager {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `fetch_page` is never used
[INFO] [stdout]   --> src/buffer.rs:91:8
[INFO] [stdout]    |
[INFO] [stdout] 90 | impl BufferPoolManager {
[INFO] [stdout]    | ---------------------- method in this implementation
[INFO] [stdout] 91 |     fn fetch_page(&mut self, page_id: PageId) -> Result<Rc<Buffer>, Error> {
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.02s
[INFO] running `Command { std: "docker" "inspect" "550feabd4482c187ce42b97ba74f06cd7dda48e1f090f7a7f6e1b86fb28fee0e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "550feabd4482c187ce42b97ba74f06cd7dda48e1f090f7a7f6e1b86fb28fee0e", kill_on_drop: false }`
[INFO] [stdout] 550feabd4482c187ce42b97ba74f06cd7dda48e1f090f7a7f6e1b86fb28fee0e