kern/54687: ATF tests time out since kern_lwp.c 1.206

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

>Number:         54687
>Category:       kern
>Synopsis:       ATF tests time out since kern_lwp.c 1.206
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Nov 10 08:10:01 +0000 2019
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2019.11.07.19.45.18
>Organization:

>Environment:
System: NetBSD
Architecture: i386
Machine: i386
>Description:

The ATF tests are timing out on multiple testbeds since this commit:

  2019.11.07.19.45.18 joerg src/sys/kern/kern_lwp.c 1.206

The commit is identified by these reports from qemu/i386:

  http://releng.netbsd.org/b5reports/i386/commits-2019.11.html#2019.11.07.19.45.18
  http://www.gson.org/netbsd/bugs/build/i386-linuxhost/commits-2019.11.html#2019.11.07.19.45.18

but the tests are also timing out on other architectures and on real hardware.

Joerg, please revert this change so that other changes committed after
it can be tested.

>How-To-Repeat:

>Fix: