[INFO] cloning repository https://github.com/bifurcation/fibonacci
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/bifurcation/fibonacci" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbifurcation%2Ffibonacci", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbifurcation%2Ffibonacci'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 20115abf733db82f75a29c44825a53c0a17b8436
[INFO] checking bifurcation/fibonacci against master#b56aaec52bc0fa35591a872fb4aac81f606e265c for pr-122661-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbifurcation%2Ffibonacci" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] error: failed to write new configuration file /workspace/builds/worker-7-tc1/source/.git/config.lock
[INFO] [stderr] fatal: could not set 'core.repositoryformatversion' to '0'


failed to checkout https://github.com/bifurcation/fibonacci

Caused by:
    command failed: exit status: 128