[INFO] cloning repository https://github.com/hanju-jo/linux-in-practice-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hanju-jo/linux-in-practice-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhanju-jo%2Flinux-in-practice-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhanju-jo%2Flinux-in-practice-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d220d80ebff125275225d470f35dbef05c117834
[INFO] testing hanju-jo/linux-in-practice-rust against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhanju-jo%2Flinux-in-practice-rust" "/workspace/builds/worker-28/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-28/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hanju-jo/linux-in-practice-rust on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/hanju-jo/linux-in-practice-rust
[INFO] finished tweaking git repo https://github.com/hanju-jo/linux-in-practice-rust
[INFO] tweaked toml for git repo https://github.com/hanju-jo/linux-in-practice-rust written to /workspace/builds/worker-28/source/Cargo.toml
[INFO] crate git repo https://github.com/hanju-jo/linux-in-practice-rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "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-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 24a12c4851b6c014bf4c6060dd02be5ae8ffd6f8d656d95e887f2b07893e8d0d
[INFO] running `Command { std: "docker" "start" "-a" "24a12c4851b6c014bf4c6060dd02be5ae8ffd6f8d656d95e887f2b07893e8d0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "24a12c4851b6c014bf4c6060dd02be5ae8ffd6f8d656d95e887f2b07893e8d0d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24a12c4851b6c014bf4c6060dd02be5ae8ffd6f8d656d95e887f2b07893e8d0d", kill_on_drop: false }`
[INFO] [stdout] 24a12c4851b6c014bf4c6060dd02be5ae8ffd6f8d656d95e887f2b07893e8d0d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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=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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 69f87e8b82c4b5e481e9787e4e2ba38b587d99bb77fd154c339a34b00c81b72e
[INFO] running `Command { std: "docker" "start" "-a" "69f87e8b82c4b5e481e9787e4e2ba38b587d99bb77fd154c339a34b00c81b72e", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.4
[INFO] [stderr]    Compiling bitflags v1.1.0
[INFO] [stderr]    Compiling num-traits v0.2.8
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling nix v0.14.1
[INFO] [stderr]    Compiling chrono v0.4.7
[INFO] [stderr]    Compiling linux_in_practice_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/bin/04-process-scheduler/sched.rs:78:26
[INFO] [stdout]    |
[INFO] [stdout] 78 | fn child_fn(stdout: &mut Write, id: u32, nrecord: usize, nloop_per_resol: i64, start: DateTime<Local>) {
[INFO] [stdout]    |                          ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 78 - fn child_fn(stdout: &mut Write, id: u32, nrecord: usize, nloop_per_resol: i64, start: DateTime<Local>) {
[INFO] [stdout] 78 + fn child_fn(stdout: &mut dyn Write, id: u32, nrecord: usize, nloop_per_resol: i64, start: DateTime<Local>) {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `child`
[INFO] [stdout]   --> src/bin/04-process-scheduler/sched.rs:42:37
[INFO] [stdout]    |
[INFO] [stdout] 42 |             Ok(ForkResult::Parent { child, .. }) => {}
[INFO] [stdout]    |                                     ^^^^^ help: try ignoring the field: `child: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/04-process-scheduler/sched.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     writeln!(stdout, "estimating workload which takes just one milliseconds");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/04-process-scheduler/sched.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     writeln!(stdout, "end estimation, {}", nloop_per_resol);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/04-process-scheduler/sched.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 |     stdout.flush();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/04-process-scheduler/sched.rs:90:9
[INFO] [stdout]    |
[INFO] [stdout] 90 |         writeln!(stdout, "{}\t{}\t{}", id, diff_msec, (i+1)*100/nrecord);  
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/04-process-scheduler/sched.rs:92:5
[INFO] [stdout]    |
[INFO] [stdout] 92 |     stdout.flush();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.32s
[INFO] running `Command { std: "docker" "inspect" "69f87e8b82c4b5e481e9787e4e2ba38b587d99bb77fd154c339a34b00c81b72e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69f87e8b82c4b5e481e9787e4e2ba38b587d99bb77fd154c339a34b00c81b72e", kill_on_drop: false }`
[INFO] [stdout] 69f87e8b82c4b5e481e9787e4e2ba38b587d99bb77fd154c339a34b00c81b72e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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=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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 58bcb497eea0660c9b2995f8f5595a371beea21bc476ef2914bf365f1e7cfe28
[INFO] running `Command { std: "docker" "start" "-a" "58bcb497eea0660c9b2995f8f5595a371beea21bc476ef2914bf365f1e7cfe28", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling linux_in_practice_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/bin/04-process-scheduler/sched.rs:78:26
[INFO] [stdout]    |
[INFO] [stdout] 78 | fn child_fn(stdout: &mut Write, id: u32, nrecord: usize, nloop_per_resol: i64, start: DateTime<Local>) {
[INFO] [stdout]    |                          ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 78 - fn child_fn(stdout: &mut Write, id: u32, nrecord: usize, nloop_per_resol: i64, start: DateTime<Local>) {
[INFO] [stdout] 78 + fn child_fn(stdout: &mut dyn Write, id: u32, nrecord: usize, nloop_per_resol: i64, start: DateTime<Local>) {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `child`
[INFO] [stdout]   --> src/bin/04-process-scheduler/sched.rs:42:37
[INFO] [stdout]    |
[INFO] [stdout] 42 |             Ok(ForkResult::Parent { child, .. }) => {}
[INFO] [stdout]    |                                     ^^^^^ help: try ignoring the field: `child: _`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/04-process-scheduler/sched.rs:33:5
[INFO] [stdout]    |
[INFO] [stdout] 33 |     writeln!(stdout, "estimating workload which takes just one milliseconds");
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/04-process-scheduler/sched.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     writeln!(stdout, "end estimation, {}", nloop_per_resol);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/04-process-scheduler/sched.rs:36:5
[INFO] [stdout]    |
[INFO] [stdout] 36 |     stdout.flush();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/04-process-scheduler/sched.rs:90:9
[INFO] [stdout]    |
[INFO] [stdout] 90 |         writeln!(stdout, "{}\t{}\t{}", id, diff_msec, (i+1)*100/nrecord);  
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/bin/04-process-scheduler/sched.rs:92:5
[INFO] [stdout]    |
[INFO] [stdout] 92 |     stdout.flush();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.71s
[INFO] [stderr]   Executable unittests src/bin/03-process-management/fork.rs (/opt/rustwide/target/debug/deps/fork-b000d7d6887e1897)
[INFO] [stderr]   Executable unittests src/bin/03-process-management/fork_and_exec.rs (/opt/rustwide/target/debug/deps/fork_and_exec-ed4b02cefc89d936)
[INFO] [stderr]   Executable unittests src/bin/02-syscall-and-non-kernel-os/hello.rs (/opt/rustwide/target/debug/deps/hello-44e0447124fc173f)
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/linux_in_practice_rust-563ee91adb455e8a)
[INFO] [stderr]   Executable unittests src/bin/02-syscall-and-non-kernel-os/loop.rs (/opt/rustwide/target/debug/deps/loop-134eacb0e0896864)
[INFO] [stderr]   Executable unittests src/bin/02-syscall-and-non-kernel-os/ppidloop.rs (/opt/rustwide/target/debug/deps/ppidloop-4462fe0378624f2a)
[INFO] [stderr]   Executable unittests src/bin/04-process-scheduler/sched.rs (/opt/rustwide/target/debug/deps/sched-26d0f7528f300e25)
[INFO] running `Command { std: "docker" "inspect" "58bcb497eea0660c9b2995f8f5595a371beea21bc476ef2914bf365f1e7cfe28", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58bcb497eea0660c9b2995f8f5595a371beea21bc476ef2914bf365f1e7cfe28", kill_on_drop: false }`
[INFO] [stdout] 58bcb497eea0660c9b2995f8f5595a371beea21bc476ef2914bf365f1e7cfe28
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-28/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=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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 426439973f9f87905fb48878dac3e48936d4414b22b5cfea98c74ea252024bae
[INFO] running `Command { std: "docker" "start" "-a" "426439973f9f87905fb48878dac3e48936d4414b22b5cfea98c74ea252024bae", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/bin/04-process-scheduler/sched.rs:78:26
[INFO] [stderr]    |
[INFO] [stderr] 78 | fn child_fn(stdout: &mut Write, id: u32, nrecord: usize, nloop_per_resol: i64, start: DateTime<Local>) {
[INFO] [stderr]    |                          ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 78 - fn child_fn(stdout: &mut Write, id: u32, nrecord: usize, nloop_per_resol: i64, start: DateTime<Local>) {
[INFO] [stderr] 78 + fn child_fn(stdout: &mut dyn Write, id: u32, nrecord: usize, nloop_per_resol: i64, start: DateTime<Local>) {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `child`
[INFO] [stderr]   --> src/bin/04-process-scheduler/sched.rs:42:37
[INFO] [stderr]    |
[INFO] [stderr] 42 |             Ok(ForkResult::Parent { child, .. }) => {}
[INFO] [stderr]    |                                     ^^^^^ help: try ignoring the field: `child: _`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/bin/04-process-scheduler/sched.rs:33:5
[INFO] [stderr]    |
[INFO] [stderr] 33 |     writeln!(stdout, "estimating workload which takes just one milliseconds");
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/bin/04-process-scheduler/sched.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     writeln!(stdout, "end estimation, {}", nloop_per_resol);
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/bin/04-process-scheduler/sched.rs:36:5
[INFO] [stderr]    |
[INFO] [stderr] 36 |     stdout.flush();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/bin/04-process-scheduler/sched.rs:90:9
[INFO] [stderr]    |
[INFO] [stderr] 90 |         writeln!(stdout, "{}\t{}\t{}", id, diff_msec, (i+1)*100/nrecord);  
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: this warning originates in the macro `writeln` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/bin/04-process-scheduler/sched.rs:92:5
[INFO] [stderr]    |
[INFO] [stderr] 92 |     stdout.flush();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: `linux_in_practice_rust` (bin "sched" test) generated 7 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.08s
[INFO] [stderr]      Running unittests src/bin/03-process-management/fork.rs (/opt/rustwide/target/debug/deps/fork-b000d7d6887e1897)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/03-process-management/fork_and_exec.rs (/opt/rustwide/target/debug/deps/fork_and_exec-ed4b02cefc89d936)
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/02-syscall-and-non-kernel-os/hello.rs (/opt/rustwide/target/debug/deps/hello-44e0447124fc173f)
[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; finished in 0.00s
[INFO] [stdout] 
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/linux_in_practice_rust-563ee91adb455e8a)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/02-syscall-and-non-kernel-os/loop.rs (/opt/rustwide/target/debug/deps/loop-134eacb0e0896864)
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/02-syscall-and-non-kernel-os/ppidloop.rs (/opt/rustwide/target/debug/deps/ppidloop-4462fe0378624f2a)
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests src/bin/04-process-scheduler/sched.rs (/opt/rustwide/target/debug/deps/sched-26d0f7528f300e25)
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "426439973f9f87905fb48878dac3e48936d4414b22b5cfea98c74ea252024bae", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "426439973f9f87905fb48878dac3e48936d4414b22b5cfea98c74ea252024bae", kill_on_drop: false }`
[INFO] [stdout] 426439973f9f87905fb48878dac3e48936d4414b22b5cfea98c74ea252024bae