[INFO] cloning repository https://github.com/hstefan/pll
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/hstefan/pll" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhstefan%2Fpll", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhstefan%2Fpll'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f6249d3b59c56a7d64f9a73c393f7887db230eac
[INFO] checking hstefan/pll against master#fce0e74720d199eb7839fdb51af35ac5226da178 for pr-145262
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhstefan%2Fpll" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] fatal: update_ref failed for ref 'HEAD': cannot update ref 'refs/heads/master': couldn't write '/workspace/builds/worker-7-tc1/source/.git/refs/heads/master.lock'


failed to checkout https://github.com/hstefan/pll

Caused by:
    command failed: exit status: 128