[INFO] crate gdb_probe 0.1.2 is already in cache
[INFO] extracting crate gdb_probe 0.1.2 into work/ex/beta-1.38-1/sources/1.37.0/reg/gdb_probe/0.1.2
[INFO] extracting crate gdb_probe 0.1.2 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/gdb_probe/0.1.2
[INFO] validating manifest of gdb_probe-0.1.2 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of gdb_probe-0.1.2 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing gdb_probe-0.1.2
[INFO] finished frobbing gdb_probe-0.1.2
[INFO] frobbed toml for gdb_probe-0.1.2 written to work/ex/beta-1.38-1/sources/1.37.0/reg/gdb_probe/0.1.2/Cargo.toml
[INFO] started frobbing gdb_probe-0.1.2
[INFO] finished frobbing gdb_probe-0.1.2
[INFO] frobbed toml for gdb_probe-0.1.2 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/gdb_probe/0.1.2/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing gdb_probe-0.1.2 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/gdb_probe/0.1.2:/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=warn" "-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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] ffea332ba0ff436acb128e8a1e316fb9c5202355c4aa9f4d19cb884c5cd02d63
[INFO] running `"docker" "start" "-a" "ffea332ba0ff436acb128e8a1e316fb9c5202355c4aa9f4d19cb884c5cd02d63"`
[INFO] [stderr]    Compiling gdb_probe v0.1.2 (/opt/crater/workdir)
[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)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::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: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.44s
[INFO] running `"docker" "inspect" "ffea332ba0ff436acb128e8a1e316fb9c5202355c4aa9f4d19cb884c5cd02d63"`
[INFO] running `"docker" "rm" "-f" "ffea332ba0ff436acb128e8a1e316fb9c5202355c4aa9f4d19cb884c5cd02d63"`
[INFO] [stdout] ffea332ba0ff436acb128e8a1e316fb9c5202355c4aa9f4d19cb884c5cd02d63
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/gdb_probe/0.1.2:/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] aefbc4c604c62763db5af12552faddf80d6e926ab473af06c07b5d92d08f55e3
[INFO] running `"docker" "start" "-a" "aefbc4c604c62763db5af12552faddf80d6e926ab473af06c07b5d92d08f55e3"`
[INFO] [stderr]    Compiling gdb_probe v0.1.2 (/opt/crater/workdir)
[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)]` on by default
[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: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::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: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.79s
[INFO] running `"docker" "inspect" "aefbc4c604c62763db5af12552faddf80d6e926ab473af06c07b5d92d08f55e3"`
[INFO] running `"docker" "rm" "-f" "aefbc4c604c62763db5af12552faddf80d6e926ab473af06c07b5d92d08f55e3"`
[INFO] [stdout] aefbc4c604c62763db5af12552faddf80d6e926ab473af06c07b5d92d08f55e3
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/gdb_probe/0.1.2:/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] b9b6b8572c0d391db62b820de407ca770d485c2c818cf9d383914ab28f5f7a1e
[INFO] running `"docker" "start" "-a" "b9b6b8572c0d391db62b820de407ca770d485c2c818cf9d383914ab28f5f7a1e"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/gdb_probe-7611fb2a571e5657
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[ERROR] error running command: no output for 300 seconds
[INFO] running `"docker" "inspect" "b9b6b8572c0d391db62b820de407ca770d485c2c818cf9d383914ab28f5f7a1e"`
[INFO] running `"docker" "rm" "-f" "b9b6b8572c0d391db62b820de407ca770d485c2c818cf9d383914ab28f5f7a1e"`
[INFO] [stdout] b9b6b8572c0d391db62b820de407ca770d485c2c818cf9d383914ab28f5f7a1e