[INFO] cloning repository https://github.com/dmvianna/rust-mandelbrot
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dmvianna/rust-mandelbrot" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdmvianna%2Frust-mandelbrot", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdmvianna%2Frust-mandelbrot'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 11405f685a651b396dde49fad81dc4d844caa768
[INFO] checking dmvianna/rust-mandelbrot against master#55e86c996809902e8bbad512cfb4d2c18be446d9 for pr-153027
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdmvianna%2Frust-mandelbrot" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/dmvianna/rust-mandelbrot
[INFO] finished tweaking git repo https://github.com/dmvianna/rust-mandelbrot
[INFO] tweaked toml for git repo https://github.com/dmvianna/rust-mandelbrot written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/dmvianna/rust-mandelbrot on toolchain 55e86c996809902e8bbad512cfb4d2c18be446d9
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+55e86c996809902e8bbad512cfb4d2c18be446d9" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/dmvianna/rust-mandelbrot 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" "+55e86c996809902e8bbad512cfb4d2c18be446d9" "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


overridden task result to prepare-fail:timeout

Caused by:
    0: uncategorized prepare error
    1: no output for 300 seconds