kern/51624: Tracee process cannot see its appropriate parent when debugged by a tracer

[n54%gmx.com@localhost]

>Number:         51624
>Category:       kern
>Synopsis:       Tracee process cannot see its appropriate parent when debugged by a tracer
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Nov 12 14:40:00 +0000 2016
>Originator:     Kamil Rytarowski
>Release:        NetBSD 7.99.42 amd64
>Organization:
TNF
>Environment:
NetBSD chieftec 7.99.42 NetBSD 7.99.42 (GENERIC) #0: Sat Nov 12 14:55:54 CET 2016  kamil@chieftec:/public/netbsd-tmp/sys/arch/amd64/compile/GENERIC amd64

With reverted: cvs rdiff -u -r1.2 -r1.3 src/sys/kern/sys_ptrace_common.c
>Description:
A process traced by a debugger is not able see its appropriate parent.
>How-To-Repeat:
cd /usr/tests/kernel
atf-run t_ptrace_wait6 | atf-report

Test attach5 verifies this aspect.

This test is going to be committed after acquiring PR number for this report.
>Fix:
N/A