[INFO] cloning repository https://github.com/pietgeursen/conway_asm_fun
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/pietgeursen/conway_asm_fun" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpietgeursen%2Fconway_asm_fun", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpietgeursen%2Fconway_asm_fun'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3ea7772ec975bc2e2970014bbdbc1a2c53c42144
[INFO] checking pietgeursen/conway_asm_fun against master#9bfa31f632912180dc742809bcc51a97f2d7079d for pr-140151
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpietgeursen%2Fconway_asm_fun" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc1/source'...
[INFO] [stderr] done.
[INFO] [stderr] fatal: update_ref failed for ref 'HEAD': cannot update ref 'refs/heads/master': couldn't write '/workspace/builds/worker-3-tc1/source/.git/refs/heads/master.lock'


failed to checkout https://github.com/pietgeursen/conway_asm_fun

Caused by:
    command failed: exit status: 128