https://go.dev/play/p/gIVVLsiTqod

I'm trying to understand concurrency, so I modified a small routine I came 
across quite a while ago.  It's a grep command, but since I have its 
source, I am trying to understand its concurrency.
My problem is that when there are more than about 1800 files to be 
processed, the go routines all deadlock.
This code works fine as long as I have fewer than about 1800 files to 
process.
I don't understand why this happens.

Windows 10.
Tried w/ go1.17, go1.18 and go1.19

--Rob Solomon

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