Bug #13533: please backport r58534

• Status: Closed
• Assignee: -
• Target version: -
• Backport: 2.2: UNKNOWN, 2.3: DONE, 2.4: DONE

[normalperson (Eric Wong)]

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.

[normalperson (Eric Wong)]

• Backport changed from 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN to 2.2: UNKNOWN, 2.3: REQUIRED, 2.4: REQUIRED

[normalperson (Eric Wong)]

• Status changed from Open to Closed

closing to trigger backport request

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.2: UNKNOWN, 2.3: REQUIRED, 2.4: REQUIRED to 2.2: UNKNOWN, 2.3: REQUIRED, 2.4: DONE

ruby_2_4 r58622 merged revision(s) 58534.

[usa (Usaku NAKAMURA)]

• Backport changed from 2.2: UNKNOWN, 2.3: REQUIRED, 2.4: DONE to 2.2: UNKNOWN, 2.3: DONE, 2.4: DONE

ruby_2_3 r59216 merged revision(s) 58534.