kern/54650: Calling accept() with a non-blocking listening socket, returns a non-blocking connected socket, which is incorrect behaviour

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>Number:         54650
>Category:       kern
>Synopsis:       Calling accept() with a non-blocking listening socket, returns a non-blocking connected socket, which is incorrect behaviour
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Oct 26 21:50:00 +0000 2019
>Originator:     Sad Clouds
>Release:        8.1
>Organization:
>Environment:
NetBSD atom510 8.1 NetBSD 8.1 (GENERIC) #0: Fri May 31 14:17:14 BST 2019  roman@z600:/netbsd_build/obj.amd64/sys/arch/amd64/compile/GENERIC amd64
>Description:
Calling accept() with a non-blocking listening socket, returns a non-blocking connected socket, which is incorrect behaviour. The new returned connected socket should be blocking.
>How-To-Repeat:

>Fix: