MacOS error: -67062 in response to attempting to kill a process

Here's the story:

1. I started a `find` command from the command line
2. It spun out of control (who knows why)
3. It would not answer ctrl-c or ctrl-z, so I closed the terminal
4. Process continued to spin, so I attempted to kill it with SIGTERM and eventually SIGKILL
5. That didn't have any effect, so I tried again using `sudo` with kill.

I then found my sudo entry in the Console, and the very next message was from `taskgated`, a "security_exception" with the text:

MacOS error: -67062

So what it looks like is the system blocked me from killing the out-of-control process. Going to have to reboot now.

Why does this happen? In the future, is there a way to circumvent this?