[INFO] cloning repository https://github.com/terberes/unwinnable
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/terberes/unwinnable" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fterberes%2Funwinnable", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fterberes%2Funwinnable'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] fa71a4038455c6520ea1c1d9809c145fc9806fec
[INFO] building terberes/unwinnable against master#70591dc15db32941fe3595fdbf98e58d6975f95e for pr-127731
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fterberes%2Funwinnable" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-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-5-tc1/source/.git/logs/refs/heads/master': No such file or directory
[INFO] [stderr] fatal: the remote end hung up unexpectedly
[ERROR] this task or one of its parent failed!
[ERROR] failed to checkout https://github.com/terberes/unwinnable
[ERROR] caused by: command failed: exit status: 128
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.