kern/54102: Multiple values from "vmstat -s" are broken

[n54%gmx.com@localhost]

>Number:         54102
>Category:       kern
>Synopsis:       Multiple values from "vmstat -s" are broken
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Apr 06 11:45:00 +0000 2019
>Originator:     Kamil Rytarowski
>Release:        8.99.36
>Organization:
TNF
>Environment:
NetBSD chieftec 8.99.36 NetBSD 8.99.36 (GENERIC) #6: Wed Apr  3 20:00:45 CEST 2019  root@chieftec:/public/netbsd-root/sys/arch/amd64/compile/GENERIC amd64
>Description:
Multiple values from "vmstat -s" are unreliable and appear to overflow.

E.g.

18446744073091529768 pagealloc desired color avail
18446744072282190447 pagealloc desired color not avail

>How-To-Repeat:
vmstat -s

Especially against some benchmarking tools and on multiprocessor longer running machines (30+ days).
>Fix:
Reflect the tool with reality of the current hardware.