the dreaded "Resource temporarily unavailable" in vi

[Mikhail Teterin]

It just started to happen again. Over and over, I open a file, start
editing, then -- at a random moment -- I get: ": input: Resource
temporarily unavailable" and vi exits....

Here is the ktrace/kdump snippet:

	98705 vi       CALL  sigaction(0x12,0x280e792c,0)
	98705 vi       RET   sigaction 0
	98705 vi       CALL  read(0,0x8090000,0xff)
	98705 vi       RET   read -1 errno 35 Resource temporarily unavailable
	98705 vi       CALL  sigaction(0x12,0x280e7914,0x280e792c)
	98705 vi       RET   sigaction 0

read(2) is failing?

	-mi (this is on a 4.8-STABLE kernel)