[INFO] updating cached repository WenjunHuang/SledMultiThreadTest
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/WenjunHuang/SledMultiThreadTest
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/WenjunHuang/SledMultiThreadTest" "work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/WenjunHuang/SledMultiThreadTest"`
[INFO] [stderr] Cloning into 'work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/WenjunHuang/SledMultiThreadTest'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/WenjunHuang/SledMultiThreadTest" "work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/WenjunHuang/SledMultiThreadTest"`
[INFO] [stderr] Cloning into 'work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/WenjunHuang/SledMultiThreadTest'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a6fa19f409ad4b6f51d8cdb5fafe78f08e09b0fc
[INFO] sha for GitHub repo WenjunHuang/SledMultiThreadTest: a6fa19f409ad4b6f51d8cdb5fafe78f08e09b0fc
[INFO] validating manifest of WenjunHuang/SledMultiThreadTest on toolchain master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of WenjunHuang/SledMultiThreadTest on toolchain try#7fea0229842e79db1159ea58ad9a653b288efee9
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing WenjunHuang/SledMultiThreadTest
[INFO] finished frobbing WenjunHuang/SledMultiThreadTest
[INFO] frobbed toml for WenjunHuang/SledMultiThreadTest written to work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/WenjunHuang/SledMultiThreadTest/Cargo.toml
[INFO] started frobbing WenjunHuang/SledMultiThreadTest
[INFO] finished frobbing WenjunHuang/SledMultiThreadTest
[INFO] frobbed toml for WenjunHuang/SledMultiThreadTest written to work/ex/pr-57967/sources/try#7fea0229842e79db1159ea58ad9a653b288efee9/gh/WenjunHuang/SledMultiThreadTest/Cargo.toml
[INFO] crate WenjunHuang/SledMultiThreadTest has a lockfile. skipping
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+7fea0229842e79db1159ea58ad9a653b288efee9-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing WenjunHuang/SledMultiThreadTest against master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54 for pr-57967
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-0/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/WenjunHuang/SledMultiThreadTest:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "build" "--frozen"`
[INFO] [stdout] a6eb89345e31bf5e55795e37801696aa0099502d3f10a1fa9c3cf99c7ce618fb
[INFO] running `"docker" "start" "-a" "a6eb89345e31bf5e55795e37801696aa0099502d3f10a1fa9c3cf99c7ce618fb"`
[INFO] [stderr]    Compiling crossbeam-utils v0.5.0
[INFO] [stderr]    Compiling coco v0.2.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.6.0
[INFO] [stderr]    Compiling historian v3.0.4
[INFO] [stderr]    Compiling crossbeam-deque v0.2.0
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling pagetable v0.1.0
[INFO] [stderr]    Compiling rayon v1.0.3
[INFO] [stderr]    Compiling pagecache v0.7.2
[INFO] [stderr]    Compiling sled v0.16.2
[INFO] [stderr]    Compiling SledMultithreadTest v0.1.0 (/opt/crater/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 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 25.27s
[INFO] running `"docker" "inspect" "a6eb89345e31bf5e55795e37801696aa0099502d3f10a1fa9c3cf99c7ce618fb"`
[INFO] running `"docker" "rm" "-f" "a6eb89345e31bf5e55795e37801696aa0099502d3f10a1fa9c3cf99c7ce618fb"`
[INFO] [stdout] a6eb89345e31bf5e55795e37801696aa0099502d3f10a1fa9c3cf99c7ce618fb
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-0/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/WenjunHuang/SledMultiThreadTest:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "test" "--frozen" "--no-run"`
[INFO] [stdout] 757a40ec1012e0b7132923934a29d9ebfddcb618ab2d02ebd4c2529e07f33498
[INFO] running `"docker" "start" "-a" "757a40ec1012e0b7132923934a29d9ebfddcb618ab2d02ebd4c2529e07f33498"`
[INFO] [stderr]    Compiling SledMultithreadTest v0.1.0 (/opt/crater/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 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 0.91s
[INFO] running `"docker" "inspect" "757a40ec1012e0b7132923934a29d9ebfddcb618ab2d02ebd4c2529e07f33498"`
[INFO] running `"docker" "rm" "-f" "757a40ec1012e0b7132923934a29d9ebfddcb618ab2d02ebd4c2529e07f33498"`
[INFO] [stdout] 757a40ec1012e0b7132923934a29d9ebfddcb618ab2d02ebd4c2529e07f33498
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-57967/worker-0/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-57967/sources/master#c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54/gh/WenjunHuang/SledMultiThreadTest:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+c1c3c4e95b69dfeaca5c5db6c622d7f90ad30a54-alt" "test" "--frozen"`
[INFO] [stdout] 7cbd5c4b3c4e5f02ce1c1cdd8fab0cdd1f73933830ab8f26f864d260256e4237
[INFO] running `"docker" "start" "-a" "7cbd5c4b3c4e5f02ce1c1cdd8fab0cdd1f73933830ab8f26f864d260256e4237"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.18s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/SledMultithreadTest-bb9252ea406c477a
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "7cbd5c4b3c4e5f02ce1c1cdd8fab0cdd1f73933830ab8f26f864d260256e4237"`
[INFO] running `"docker" "rm" "-f" "7cbd5c4b3c4e5f02ce1c1cdd8fab0cdd1f73933830ab8f26f864d260256e4237"`
[INFO] [stdout] 7cbd5c4b3c4e5f02ce1c1cdd8fab0cdd1f73933830ab8f26f864d260256e4237