bin/55721: usr.sbin/cpuctl/t_cpuctl:nointr, offline tests fail

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         55721
>Category:       bin
>Synopsis:       usr.sbin/cpuctl/t_cpuctl:nointr, offline tests fail
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Oct 12 07:40:00 +0000 2020
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
>Organization:
>Environment:
System: NetBSD
Architecture: x86_64
Machine: amd64
>Description:

The "nointr" and "offline" test cases of the usr.sbin/cpuctl/t_cpuctl
test program now fail on real amd64 hardware:

  http://www.gson.org/netbsd/bugs/build/amd64-baremetal/2020/2020.10.11.19.39.22/test.html#usr.sbin_cpuctl_t_cpuctl_nointr

The problem started some time between source dates 2020.10.03.18.54.18
and 2020.10.11.07.07.32.

>How-To-Repeat:

>Fix: