Issue #13533 has been reported by normalperson (Eric Wong).

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Bug #13533: please backport r58534
https://bugs.ruby-lang.org/issues/13533

* Author: normalperson (Eric Wong)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
```
This bug causes busy wait (100% CPU usage) on IO.copy_stream
with sockets/pipes with O_NONBLOCK set.

In other words, the following code should not cause 100% CPU usage,
just hang forever w/o burning CPU:

	require 'io/nonblock'
	r, w = IO.pipe
	r.nonblock = true
	IO.copy_stream(r, IO::NULL)

This affects Ruby 2.3 and 2.4.
```




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