[INFO] cloning repository https://github.com/ichyo/isucon9-qualify-rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ichyo/isucon9-qualify-rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fichyo%2Fisucon9-qualify-rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fichyo%2Fisucon9-qualify-rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4f6e5e920da267557f02c8cf1d14e30b2b443650
[INFO] checking ichyo/isucon9-qualify-rust against master#f8f6997469237299c1d60814c7b9828602a1f8e4 for pr-143808
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fichyo%2Fisucon9-qualify-rust" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] error: unable to write symref for refs/remotes/origin/HEAD: No space left on device
[INFO] [stderr] fatal: unable to update refs/remotes/origin/HEAD


failed to checkout https://github.com/ichyo/isucon9-qualify-rust

Caused by:
    command failed: exit status: 128