http://freebsd.org is not really friendly to contributors. They have to figure out on their own that they should submit patches via creating PR in GNATS.
Ideally, there should be a page that describes what contributors need to do to have their patches considered for adding to base source code.
For bugs that match the following
- Status Is In progress
- Untouched since 2018-01-01.
- Affects Base System OR Documentation
Reset to open status.
I did a quick pass but if you are getting this email it might be worthwhile to double check to see if this bug ought to be closed.