[INFO] cloning repository https://github.com/tomaka/cargo-bug-repro-20200624
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tomaka/cargo-bug-repro-20200624" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftomaka%2Fcargo-bug-repro-20200624", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftomaka%2Fcargo-bug-repro-20200624'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 855e00d78d32ef0763c67608329c83a98de1440e
[INFO] checking tomaka/cargo-bug-repro-20200624 against master#419b3e2d3e350822550eee0e82eeded4d324d584 for pr-135536
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftomaka%2Fcargo-bug-repro-20200624" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] error: Unable to create '/workspace/builds/worker-5-tc1/source/.git/refs/remotes/origin/HEAD.lock': No such file or directory
[INFO] [stderr] fatal: unable to update refs/remotes/origin/HEAD


failed to checkout https://github.com/tomaka/cargo-bug-repro-20200624

Caused by:
    command failed: exit status: 128