[INFO] cloning repository https://github.com/weezy20/await-mutex [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/weezy20/await-mutex" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fweezy20%2Fawait-mutex", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fweezy20%2Fawait-mutex'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] f478138f2b1ded9d77f9332eba5dcc6eb0626154 [INFO] testing weezy20/await-mutex against master#414482f6a0d4e7290f614300581a0b55442552a3 for pr-140985 [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fweezy20%2Fawait-mutex" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'... [INFO] [stderr] done. [INFO] [stderr] fatal: update_ref failed for ref 'HEAD': cannot update the ref 'refs/heads/master': unable to create directory for '/workspace/builds/worker-4-tc1/source/.git/logs/refs/heads/master': No such file or directory failed to checkout https://github.com/weezy20/await-mutex Caused by: command failed: exit status: 128