I noticed that usbd is just about always Runnable on my system, and according
to "ps -uax" it is taking roughly 40% of the CPU.  Is this normal?
I last did a build on January 1st.

Looking at the source, it ought to be pausing for 30 seconds in select,
so it would seem that select is returning early.  I do have USB ports,
but nothing is plugged into them.