kern/52168: attach2:t_ptrace_wait* is unsable

[n54%gmx.com@localhost]

>Number:         52168
>Category:       kern
>Synopsis:       attach2:t_ptrace_wait* is unsable
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Apr 16 13:00:00 +0000 2017
>Originator:     Kamil Rytarowski
>Release:        NetBSD 7.99.68 amd64
>Organization:
TNF
>Environment:
NetBSD chieftec 7.99.68 NetBSD 7.99.68 (GENERIC) #1: Fri Apr 14 05:48:41 CEST 2017  root@chieftec:/public/netbsd-root/sys/arch/amd64/compile/GENERIC amd64
>Description:
attach2 is unstable on all ports and with combination of all wait(2)-like functions.
>How-To-Repeat:
Run test in: tests/lib/libc/sys

atf-run t_ptrace_wait*|atf-report
>Fix:
N/A