[INFO] cloning repository https://github.com/mostafahagras/Math-expression-eval
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mostafahagras/Math-expression-eval" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmostafahagras%2FMath-expression-eval", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmostafahagras%2FMath-expression-eval'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 633dbb27807bc54cd7f8ab1a5e67bc46baf8e5b1
[INFO] testing mostafahagras/Math-expression-eval against master#552a959051cebf8f88a8f558399baf733bec9ce0 for pr-136932
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmostafahagras%2FMath-expression-eval" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] error: failed to write new configuration file /workspace/builds/worker-4-tc1/source/.git/config.lock
[INFO] [stderr] fatal: could not set 'core.repositoryformatversion' to '0'


failed to checkout https://github.com/mostafahagras/Math-expression-eval

Caused by:
    command failed: exit status: 128