[INFO] fetching crate gdb_probe 0.1.2...
[INFO] testing gdb_probe-0.1.2 against try#bd7d74411512a3dd3b35d2f699c51dd2557c7e7e+cargoflags=-Zbuild-dir-new-layout for pr-149852-1
[INFO] extracting crate gdb_probe 0.1.2 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate gdb_probe 0.1.2
[INFO] finished tweaking crates.io crate gdb_probe 0.1.2
[INFO] tweaked toml for crates.io crate gdb_probe 0.1.2 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate gdb_probe 0.1.2 on toolchain bd7d74411512a3dd3b35d2f699c51dd2557c7e7e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bd7d74411512a3dd3b35d2f699c51dd2557c7e7e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bd7d74411512a3dd3b35d2f699c51dd2557c7e7e" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 8 packages to latest compatible versions
[INFO] [stderr]       Adding nix v0.13.1 (available: v0.30.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+bd7d74411512a3dd3b35d2f699c51dd2557c7e7e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+bd7d74411512a3dd3b35d2f699c51dd2557c7e7e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 849d04513151c1c69e7305689c78c639cd05fb70639bc15a53868a5c19b45280
[INFO] running `Command { std: "docker" "start" "-a" "849d04513151c1c69e7305689c78c639cd05fb70639bc15a53868a5c19b45280", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "849d04513151c1c69e7305689c78c639cd05fb70639bc15a53868a5c19b45280", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "849d04513151c1c69e7305689c78c639cd05fb70639bc15a53868a5c19b45280", kill_on_drop: false }`
[INFO] [stdout] 849d04513151c1c69e7305689c78c639cd05fb70639bc15a53868a5c19b45280
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+bd7d74411512a3dd3b35d2f699c51dd2557c7e7e" "build" "--frozen" "--message-format=json" "-Zbuild-dir-new-layout", kill_on_drop: false }`
[INFO] [stdout] 97f89c799579974e5c730d0518f66571cae5217ec663c509f872606c160a1393
[INFO] running `Command { std: "docker" "start" "-a" "97f89c799579974e5c730d0518f66571cae5217ec663c509f872606c160a1393", kill_on_drop: false }`
[INFO] [stderr]    Compiling nix v0.13.1
[INFO] [stderr]    Compiling void v1.0.2
[INFO] [stderr]    Compiling gdb_probe v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/lib.rs:20:124
[INFO] [stdout]    |
[INFO] [stdout] 20 |            execvp(&CString::new("urxvt").unwrap(), &argv_c[..]).expect("could not execv terminal, maybe urxvt is missing?");
[INFO] [stdout]    |            ----------------------------------------------------------------------------------------------------------------^ unreachable expression
[INFO] [stdout]    |            |
[INFO] [stdout]    |            any code following this expression is unreachable
[INFO] [stdout]    |
[INFO] [stdout] note: this expression has type `void::Void`, which is uninhabited
[INFO] [stdout]   --> src/lib.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 |            execvp(&CString::new("urxvt").unwrap(), &argv_c[..]).expect("could not execv terminal, maybe urxvt is missing?");
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `child`
[INFO] [stdout]  --> src/lib.rs:9:32
[INFO] [stdout]   |
[INFO] [stdout] 9 |        Ok(ForkResult::Parent { child, .. }) => {
[INFO] [stdout]   |                                ^^^^^ help: try ignoring the field: `child: _`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |            kill(getpid(), Signal::SIGSTOP );
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 11 |            let _ = kill(getpid(), Signal::SIGSTOP );
[INFO] [stdout]    |            +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.23s
[INFO] running `Command { std: "docker" "inspect" "97f89c799579974e5c730d0518f66571cae5217ec663c509f872606c160a1393", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "97f89c799579974e5c730d0518f66571cae5217ec663c509f872606c160a1393", kill_on_drop: false }`
[INFO] [stdout] 97f89c799579974e5c730d0518f66571cae5217ec663c509f872606c160a1393
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+bd7d74411512a3dd3b35d2f699c51dd2557c7e7e" "test" "--frozen" "--no-run" "--message-format=json" "-Zbuild-dir-new-layout", kill_on_drop: false }`
[INFO] [stdout] 713cfde94cbc895e298988e333a5a19eda909c9b5cd5e6467637658849336978
[INFO] running `Command { std: "docker" "start" "-a" "713cfde94cbc895e298988e333a5a19eda909c9b5cd5e6467637658849336978", kill_on_drop: false }`
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/lib.rs:20:124
[INFO] [stdout]    |
[INFO] [stdout] 20 |            execvp(&CString::new("urxvt").unwrap(), &argv_c[..]).expect("could not execv terminal, maybe urxvt is missing?");
[INFO] [stdout]    |            ----------------------------------------------------------------------------------------------------------------^ unreachable expression
[INFO] [stdout]    |            |
[INFO] [stdout]    |            any code following this expression is unreachable
[INFO] [stdout]    |
[INFO] [stdout] note: this expression has type `void::Void`, which is uninhabited
[INFO] [stdout]   --> src/lib.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 |            execvp(&CString::new("urxvt").unwrap(), &argv_c[..]).expect("could not execv terminal, maybe urxvt is missing?");
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `child`
[INFO] [stdout]  --> src/lib.rs:9:32
[INFO] [stdout]   |
[INFO] [stdout] 9 |        Ok(ForkResult::Parent { child, .. }) => {
[INFO] [stdout]   |                                ^^^^^ help: try ignoring the field: `child: _`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |            kill(getpid(), Signal::SIGSTOP );
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 11 |            let _ = kill(getpid(), Signal::SIGSTOP );
[INFO] [stdout]    |            +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling gdb_probe v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unreachable expression
[INFO] [stdout]   --> src/lib.rs:20:124
[INFO] [stdout]    |
[INFO] [stdout] 20 |            execvp(&CString::new("urxvt").unwrap(), &argv_c[..]).expect("could not execv terminal, maybe urxvt is missing?");
[INFO] [stdout]    |            ----------------------------------------------------------------------------------------------------------------^ unreachable expression
[INFO] [stdout]    |            |
[INFO] [stdout]    |            any code following this expression is unreachable
[INFO] [stdout]    |
[INFO] [stdout] note: this expression has type `void::Void`, which is uninhabited
[INFO] [stdout]   --> src/lib.rs:20:12
[INFO] [stdout]    |
[INFO] [stdout] 20 |            execvp(&CString::new("urxvt").unwrap(), &argv_c[..]).expect("could not execv terminal, maybe urxvt is missing?");
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `child`
[INFO] [stdout]  --> src/lib.rs:9:32
[INFO] [stdout]   |
[INFO] [stdout] 9 |        Ok(ForkResult::Parent { child, .. }) => {
[INFO] [stdout]   |                                ^^^^^ help: try ignoring the field: `child: _`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]   --> src/lib.rs:32:13
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let x = 3+4;
[INFO] [stdout]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 |            kill(getpid(), Signal::SIGSTOP );
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 11 |            let _ = kill(getpid(), Signal::SIGSTOP );
[INFO] [stdout]    |            +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.36s
[INFO] running `Command { std: "docker" "inspect" "713cfde94cbc895e298988e333a5a19eda909c9b5cd5e6467637658849336978", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "713cfde94cbc895e298988e333a5a19eda909c9b5cd5e6467637658849336978", kill_on_drop: false }`
[INFO] [stdout] 713cfde94cbc895e298988e333a5a19eda909c9b5cd5e6467637658849336978
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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@sha256:98afbf2d16093dec2546ff8915fddc74e65664aa03fc460b3712b1c2c54a33e4" "/opt/rustwide/cargo-home/bin/cargo" "+bd7d74411512a3dd3b35d2f699c51dd2557c7e7e" "test" "--frozen" "-Zbuild-dir-new-layout", kill_on_drop: false }`
[INFO] [stdout] 58d2886223fbc014ba6938cc72fd4a5f553ef94b22613b7d0d11b8b66b074c36
[INFO] running `Command { std: "docker" "start" "-a" "58d2886223fbc014ba6938cc72fd4a5f553ef94b22613b7d0d11b8b66b074c36", kill_on_drop: false }`
[INFO] [stderr] warning: unreachable expression
[INFO] [stdout] 
[INFO] [stderr]   --> src/lib.rs:20:124
[INFO] [stdout] running 1 test
[INFO] [stderr]    |
[INFO] [stderr] 20 |            execvp(&CString::new("urxvt").unwrap(), &argv_c[..]).expect("could not execv terminal, maybe urxvt is missing?");
[INFO] [stderr]    |            ----------------------------------------------------------------------------------------------------------------^ unreachable expression
[INFO] [stderr]    |            |
[INFO] [stderr]    |            any code following this expression is unreachable
[INFO] [stderr]    |
[INFO] [stderr] note: this expression has type `void::Void`, which is uninhabited
[INFO] [stderr]   --> src/lib.rs:20:12
[INFO] [stderr]    |
[INFO] [stderr] 20 |            execvp(&CString::new("urxvt").unwrap(), &argv_c[..]).expect("could not execv terminal, maybe urxvt is missing?");
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `child`
[INFO] [stderr]  --> src/lib.rs:9:32
[INFO] [stderr]   |
[INFO] [stderr] 9 |        Ok(ForkResult::Parent { child, .. }) => {
[INFO] [stderr]   |                                ^^^^^ help: try ignoring the field: `child: _`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `Result` that must be used
[INFO] [stderr]   --> src/lib.rs:11:12
[INFO] [stderr]    |
[INFO] [stderr] 11 |            kill(getpid(), Signal::SIGSTOP );
[INFO] [stderr]    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 11 |            let _ = kill(getpid(), Signal::SIGSTOP );
[INFO] [stderr]    |            +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]   --> src/lib.rs:32:13
[INFO] [stderr]    |
[INFO] [stderr] 32 |         let x = 3+4;
[INFO] [stderr]    |             ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: `gdb_probe` (lib) generated 3 warnings (run `cargo fix --lib -p gdb_probe` to apply 1 suggestion)
[INFO] [stderr] warning: `gdb_probe` (lib test) generated 4 warnings (3 duplicates) (run `cargo fix --lib -p gdb_probe --tests` to apply 1 suggestion)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/build/gdb_probe/1c95878e0c8d870d/deps/gdb_probe-1c95878e0c8d870d)
[ERROR] error running command: no output for 300 seconds
[INFO] running `Command { std: "docker" "inspect" "58d2886223fbc014ba6938cc72fd4a5f553ef94b22613b7d0d11b8b66b074c36", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58d2886223fbc014ba6938cc72fd4a5f553ef94b22613b7d0d11b8b66b074c36", kill_on_drop: false }`
[INFO] [stdout] 58d2886223fbc014ba6938cc72fd4a5f553ef94b22613b7d0d11b8b66b074c36
