[INFO] cloning repository https://github.com/hphucnp/rust_guessing_game
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hphucnp/rust_guessing_game" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhphucnp%2Frust_guessing_game", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhphucnp%2Frust_guessing_game'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e85607f77421de430af576d2bf56bbd5eeb11240
[INFO] testing hphucnp/rust_guessing_game against master#552a959051cebf8f88a8f558399baf733bec9ce0 for pr-136932
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhphucnp%2Frust_guessing_game" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] fatal: update_ref failed for ref 'HEAD': cannot update the ref 'refs/heads/core': unable to create directory for '/workspace/builds/worker-1-tc1/source/.git/logs/refs/heads/core': No such file or directory


failed to checkout https://github.com/hphucnp/rust_guessing_game

Caused by:
    command failed: exit status: 128