[INFO] cloning repository https://github.com/colbyn/latex2
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/colbyn/latex2" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcolbyn%2Flatex2", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcolbyn%2Flatex2'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9b1ebb89a036ee9e48752af0d93afc8cfde90b10
[INFO] checking colbyn/latex2 against master#667247db71ea18c4130dd018d060e7f09d589490 for pr-140824
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcolbyn%2Flatex2" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-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-3-tc1/source/.git/refs/heads/master.lock'


failed to checkout https://github.com/colbyn/latex2

Caused by:
    command failed: exit status: 128