mysqld does not properly detach, and the funky shell script startup
that is uses causes mysqld to not detach properly, and when the parent
exits, the process group gets a SIGHUP. Well, in mysql 5.0 a HUP
causes the mysqld to reload its grant tables, even though it was
started with --skip-grant-tables, which causes everything on boss to
completely break.

So, on FreeBSD6, start mysqld with "daemon" utility program, which
does the proper detach.