[INFO] cloning repository https://github.com/qiuqiyuan/rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/qiuqiyuan/rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fqiuqiyuan%2Frust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fqiuqiyuan%2Frust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c59ae61a18955fa860e0f698308c5bedb72f202f
[INFO] checking qiuqiyuan/rust against master#90384941aae4ea38de00e4702b50757e9b882a19 for pr-138340
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fqiuqiyuan%2Frust" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] fatal: update_ref failed for ref 'HEAD': cannot update the ref 'refs/heads/master': unable to create directory for '/workspace/builds/worker-2-tc1/source/.git/logs/refs/heads/master': No such file or directory


failed to checkout https://github.com/qiuqiyuan/rust

Caused by:
    command failed: exit status: 128