I use FreeBSD 10.0 release. For reviewing sysctl settings I typically use:
It always showed the presence of ``kern.msgbuf'', but it never listed its content. I verified with 9.1-STABLE.
In FreeBSD 10 kern.msgbuf's content is shown. As a result of showing some garbage from prior invocations of ncurses-based programs sysctl -a causes my console to get stuck.
I must do 'reset' to unstuck it.
I think kern.msgbuf should be hidden from sysctl -a.