why is [acpi_task1] killable?

[Benjamin Lutz]

Hello,

I've (accidentally, because of a broken pidfile) noticed yesterday that
root can kill [acpi_task1] (PID 8 on my system, FreeBSD 5.4-p5/i386).
Killing it resulted in an immediate and total lockup of the system.

I gather that processes with [ ] around their name are parts of the
kernel. Shouldn't they be protected from kills? Note this was a standard
kill, not a kill -9 or anything mean like that.

Cheers
Benjamin
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