[INFO] updating cached repository https://github.com/bingli224/rust_test_thrd_mutex
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a91c5820af426871ea424b0e92f70eb39f3b3c2f
[INFO] checking bingli224/rust_test_thrd_mutex against master#45d050cde277b22a755847338f2acc2c7b834141 for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbingli224%2Frust_test_thrd_mutex" "/workspace/builds/worker-13/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-13/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bingli224/rust_test_thrd_mutex on toolchain 45d050cde277b22a755847338f2acc2c7b834141
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/bingli224/rust_test_thrd_mutex
[INFO] finished tweaking git repo https://github.com/bingli224/rust_test_thrd_mutex
[INFO] tweaked toml for git repo https://github.com/bingli224/rust_test_thrd_mutex written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] crate git repo https://github.com/bingli224/rust_test_thrd_mutex already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+45d050cde277b22a755847338f2acc2c7b834141" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+45d050cde277b22a755847338f2acc2c7b834141" "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] 3e4fa0904112b2ac08f6499fcdabaa0a8abb4cf7bf3204473a6abd7b1464e750
[INFO] running `"docker" "start" "-a" "3e4fa0904112b2ac08f6499fcdabaa0a8abb4cf7bf3204473a6abd7b1464e750"`
[INFO] [stderr]     Checking c2-chacha v0.2.2
[INFO] [stderr]     Checking getrandom v0.1.10
[INFO] [stderr]     Checking rand_core v0.5.0
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.0
[INFO] [stderr]     Checking pulling_game v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused imports: `io::Write`, `io::stdout`, `thread::sleep`, `time::Duration`
[INFO] [stderr]   --> src/test.rs:10:13
[INFO] [stderr]    |
[INFO] [stderr] 10 |             thread::sleep,
[INFO] [stderr]    |             ^^^^^^^^^^^^^
[INFO] [stderr] 11 |             time::Duration,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^
[INFO] [stderr] 12 | 
[INFO] [stderr] 13 |             io::Write,
[INFO] [stderr]    |             ^^^^^^^^^
[INFO] [stderr] 14 |             io::stdout,
[INFO] [stderr]    |             ^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `rand::Rng`
[INFO] [stderr]   --> src/test.rs:19:9
[INFO] [stderr]    |
[INFO] [stderr] 19 |     use rand::Rng;
[INFO] [stderr]    |         ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.33s
[INFO] running `"docker" "inspect" "3e4fa0904112b2ac08f6499fcdabaa0a8abb4cf7bf3204473a6abd7b1464e750"`
[INFO] running `"docker" "rm" "-f" "3e4fa0904112b2ac08f6499fcdabaa0a8abb4cf7bf3204473a6abd7b1464e750"`
[INFO] [stdout] 3e4fa0904112b2ac08f6499fcdabaa0a8abb4cf7bf3204473a6abd7b1464e750