[INFO] cloning repository https://github.com/WenjunHuang/SledMultiThreadTest
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/WenjunHuang/SledMultiThreadTest" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWenjunHuang%2FSledMultiThreadTest"`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWenjunHuang%2FSledMultiThreadTest'...
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a6fa19f409ad4b6f51d8cdb5fafe78f08e09b0fc
[INFO] checking WenjunHuang/SledMultiThreadTest against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FWenjunHuang%2FSledMultiThreadTest" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/WenjunHuang/SledMultiThreadTest on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/WenjunHuang/SledMultiThreadTest
[INFO] finished tweaking git repo https://github.com/WenjunHuang/SledMultiThreadTest
[INFO] tweaked toml for git repo https://github.com/WenjunHuang/SledMultiThreadTest written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/WenjunHuang/SledMultiThreadTest already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f97c3d1af195ff24083892d5e071547bb7484b4eb6b6e3ab43f5e728cd57aa1e
[INFO] running `"docker" "start" "-a" "f97c3d1af195ff24083892d5e071547bb7484b4eb6b6e3ab43f5e728cd57aa1e"`
[INFO] [stderr]     Checking crossbeam-utils v0.5.0
[INFO] [stderr]     Checking coco v0.2.1
[INFO] [stderr]     Checking bincode v1.0.1
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking crossbeam-epoch v0.6.0
[INFO] [stderr]     Checking historian v3.0.4
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]     Checking pagetable v0.1.0
[INFO] [stderr]     Checking rayon-core v1.4.1
[INFO] [stderr]     Checking rayon v1.0.3
[INFO] [stderr]     Checking pagecache v0.7.2
[INFO] [stderr]     Checking sled v0.16.2
[INFO] [stderr]     Checking SledMultithreadTest v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `SubCommand`
[INFO] [stderr]  --> src/main.rs:4:22
[INFO] [stderr]   |
[INFO] [stderr] 4 | use clap::{App, Arg, SubCommand};
[INFO] [stderr]   |                      ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `SubCommand`
[INFO] [stderr]  --> src/main.rs:4:22
[INFO] [stderr]   |
[INFO] [stderr] 4 | use clap::{App, Arg, SubCommand};
[INFO] [stderr]   |                      ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `prefix`
[INFO] [stderr]   --> src/main.rs:62:31
[INFO] [stderr]    |
[INFO] [stderr] 62 | fn check_write(db: Arc<Tree>, prefix: i32) {
[INFO] [stderr]    |                               ^^^^^^ help: consider prefixing with an underscore: `_prefix`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `prefix`
[INFO] [stderr]   --> src/main.rs:89:30
[INFO] [stderr]    |
[INFO] [stderr] 89 | fn check_read(db: Arc<Tree>, prefix: i32) {
[INFO] [stderr]    |                              ^^^^^^ help: consider prefixing with an underscore: `_prefix`
[INFO] [stderr] 
[INFO] [stderr] warning: crate `SledMultithreadTest` should have a snake case name
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr]   = help: convert the identifier to snake case: `sled_multithread_test`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `prefix`
[INFO] [stderr]   --> src/main.rs:62:31
[INFO] [stderr]    |
[INFO] [stderr] 62 | fn check_write(db: Arc<Tree>, prefix: i32) {
[INFO] [stderr]    |                               ^^^^^^ help: consider prefixing with an underscore: `_prefix`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `prefix`
[INFO] [stderr]   --> src/main.rs:89:30
[INFO] [stderr]    |
[INFO] [stderr] 89 | fn check_read(db: Arc<Tree>, prefix: i32) {
[INFO] [stderr]    |                              ^^^^^^ help: consider prefixing with an underscore: `_prefix`
[INFO] [stderr] 
[INFO] [stderr] warning: crate `SledMultithreadTest` should have a snake case name
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr]   = help: convert the identifier to snake case: `sled_multithread_test`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 17.22s
[INFO] running `"docker" "inspect" "f97c3d1af195ff24083892d5e071547bb7484b4eb6b6e3ab43f5e728cd57aa1e"`
[INFO] running `"docker" "rm" "-f" "f97c3d1af195ff24083892d5e071547bb7484b4eb6b6e3ab43f5e728cd57aa1e"`
[INFO] [stdout] f97c3d1af195ff24083892d5e071547bb7484b4eb6b6e3ab43f5e728cd57aa1e