[INFO] cloning repository https://github.com/kgish/rust-ffi-sqrt
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kgish/rust-ffi-sqrt" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkgish%2Frust-ffi-sqrt", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkgish%2Frust-ffi-sqrt'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9aa62d1cc1dc1a302fd730ce496e6715b442cd31
[INFO] building kgish/rust-ffi-sqrt against master#9bd71afb90c2a6e0348cdd4a2b10a3bf39908f19 for pr-117684
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkgish%2Frust-ffi-sqrt" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kgish/rust-ffi-sqrt on toolchain 9bd71afb90c2a6e0348cdd4a2b10a3bf39908f19
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9bd71afb90c2a6e0348cdd4a2b10a3bf39908f19" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kgish/rust-ffi-sqrt
[INFO] finished tweaking git repo https://github.com/kgish/rust-ffi-sqrt
[INFO] tweaked toml for git repo https://github.com/kgish/rust-ffi-sqrt written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/kgish/rust-ffi-sqrt already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9bd71afb90c2a6e0348cdd4a2b10a3bf39908f19" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] building kgish/rust-ffi-sqrt against try#53e03135c36e913ff664ce8329041b7e3c2fd358 for pr-117684
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkgish%2Frust-ffi-sqrt" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kgish/rust-ffi-sqrt on toolchain 53e03135c36e913ff664ce8329041b7e3c2fd358
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+53e03135c36e913ff664ce8329041b7e3c2fd358" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kgish/rust-ffi-sqrt
[INFO] finished tweaking git repo https://github.com/kgish/rust-ffi-sqrt
[INFO] tweaked toml for git repo https://github.com/kgish/rust-ffi-sqrt written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/kgish/rust-ffi-sqrt already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+53e03135c36e913ff664ce8329041b7e3c2fd358" "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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:0c7e0e8312ad82a1bed3696438480b7da990d348377d3754e1cd95b06a8a36c7" "/opt/rustwide/cargo-home/bin/cargo" "+53e03135c36e913ff664ce8329041b7e3c2fd358" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ccb9d3948a5eabdb5c1ad8bfd62d5b86c4d4826e4d4cfb34baa86ce23850c3eb
[INFO] running `Command { std: "docker" "start" "-a" "ccb9d3948a5eabdb5c1ad8bfd62d5b86c4d4826e4d4cfb34baa86ce23850c3eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ccb9d3948a5eabdb5c1ad8bfd62d5b86c4d4826e4d4cfb34baa86ce23850c3eb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ccb9d3948a5eabdb5c1ad8bfd62d5b86c4d4826e4d4cfb34baa86ce23850c3eb", kill_on_drop: false }`
[INFO] [stdout] ccb9d3948a5eabdb5c1ad8bfd62d5b86c4d4826e4d4cfb34baa86ce23850c3eb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:0c7e0e8312ad82a1bed3696438480b7da990d348377d3754e1cd95b06a8a36c7" "/opt/rustwide/cargo-home/bin/cargo" "+53e03135c36e913ff664ce8329041b7e3c2fd358" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6af2f51e64299caa77c0d5054be3543e1458ffb2ac4362305caa773d0a71df47
[INFO] running `Command { std: "docker" "start" "-a" "6af2f51e64299caa77c0d5054be3543e1458ffb2ac4362305caa773d0a71df47", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-ffi-sqrt v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: attribute should be applied to an `extern` block with non-Rust ABI
[INFO] [stdout]   --> src/main.rs:5:1
[INFO] [stdout]    |
[INFO] [stdout] 5  |   #[link(name = "m")]
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 6  | / fn main() {
[INFO] [stdout] 7  | |
[INFO] [stdout] 8  | |     let x: f64 = 2.;
[INFO] [stdout] 9  | |     let result: f64 = unsafe { sqrt(x) };
[INFO] [stdout] 10 | |
[INFO] [stdout] 11 | |     println!("The square root of {} is {}", x, result);
[INFO] [stdout] 12 | | }
[INFO] [stdout]    | |_- not an `extern` block
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.16s
[INFO] running `Command { std: "docker" "inspect" "6af2f51e64299caa77c0d5054be3543e1458ffb2ac4362305caa773d0a71df47", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6af2f51e64299caa77c0d5054be3543e1458ffb2ac4362305caa773d0a71df47", kill_on_drop: false }`
[INFO] [stdout] 6af2f51e64299caa77c0d5054be3543e1458ffb2ac4362305caa773d0a71df47
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:0c7e0e8312ad82a1bed3696438480b7da990d348377d3754e1cd95b06a8a36c7" "/opt/rustwide/cargo-home/bin/cargo" "+53e03135c36e913ff664ce8329041b7e3c2fd358" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0bc6d4ab7c0377a791589410043ec746b01ed8488a6845821cec2d7d26851a29
[INFO] running `Command { std: "docker" "start" "-a" "0bc6d4ab7c0377a791589410043ec746b01ed8488a6845821cec2d7d26851a29", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-ffi-sqrt v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: attribute should be applied to an `extern` block with non-Rust ABI
[INFO] [stdout]   --> src/main.rs:5:1
[INFO] [stdout]    |
[INFO] [stdout] 5  |   #[link(name = "m")]
[INFO] [stdout]    |   ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 6  | / fn main() {
[INFO] [stdout] 7  | |
[INFO] [stdout] 8  | |     let x: f64 = 2.;
[INFO] [stdout] 9  | |     let result: f64 = unsafe { sqrt(x) };
[INFO] [stdout] 10 | |
[INFO] [stdout] 11 | |     println!("The square root of {} is {}", x, result);
[INFO] [stdout] 12 | | }
[INFO] [stdout]    | |_- not an `extern` block
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.26s
[INFO] running `Command { std: "docker" "inspect" "0bc6d4ab7c0377a791589410043ec746b01ed8488a6845821cec2d7d26851a29", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0bc6d4ab7c0377a791589410043ec746b01ed8488a6845821cec2d7d26851a29", kill_on_drop: false }`
[INFO] [stdout] 0bc6d4ab7c0377a791589410043ec746b01ed8488a6845821cec2d7d26851a29