[INFO] cloning repository https://github.com/haloboy777/rust_rng
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/haloboy777/rust_rng" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhaloboy777%2Frust_rng", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhaloboy777%2Frust_rng'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6d62d460175a591379d4780b173e200c9afbe6ad
[INFO] checking haloboy777/rust_rng against master#a9e7b30487235621751cc628f170c0f15fb215c4 for pr-136539
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhaloboy777%2Frust_rng" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] error: failed to write new configuration file /workspace/builds/worker-6-tc1/source/.git/config.lock
[INFO] [stderr] fatal: could not set 'core.repositoryformatversion' to '0'


failed to checkout https://github.com/haloboy777/rust_rng

Caused by:
    command failed: exit status: 128