git status --ignored hangs when a deep directory structure present in working tree

Hi all, I have ran across what might be a bug in git. When there is a
deep directory structure (tried on 100+ nested dirs), then git status
--ignored hangs indefinitely.
Discovered this on OSX (Mojave, git 2.20.1 (Apple Git-117)), but it
reproduces in Ubuntu (19.04, git 2.25.0) Docker container on OSX and
also on baremetal Ubuntu server (16.04, git 2.17.1).

Steps to reproduce:

1. Generate the deep dir structure:

    mkdir gittest; pushd gittest; git init; for i in $(seq 1 120); do
mkdir dir; cd dir; done; touch leaf; popd

2. Try to get git status --ignored

    cd gittest && git status --ignored


If there is a dir depth limit, git should probably exit with an error
rather than getting stuck endlessly.

StackOverflow report:
https://stackoverflow.com/questions/59928800/git-status-ignored-hangs-indefinitely

Best regards,
Martin Melka