[INFO] cloning repository https://github.com/grajnikanth/rust-serde-example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/grajnikanth/rust-serde-example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgrajnikanth%2Frust-serde-example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgrajnikanth%2Frust-serde-example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ec14ef1cbd496ee8577fb65f42d558c9838f16a3
[INFO] checking grajnikanth/rust-serde-example against master#cb06d12710575a0d7ff71d6fe108f3bcff4f9195 for pr-128425-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgrajnikanth%2Frust-serde-example" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-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-0-tc1/source/.git/logs/refs/heads/master': No such file or directory


failed to checkout https://github.com/grajnikanth/rust-serde-example

Caused by:
    command failed: exit status: 128