kern/54840: Some ATF test runs leave h_ps_strings2 process running

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

>Number:         54840
>Category:       kern
>Synopsis:       Some ATF test runs leave h_ps_strings2 process running
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 07 09:50:00 +0000 2020
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current
>Organization:
>Environment:
System: NetBSD
Architecture: i386
Machine: i386
>Description:

Several recent ATF test runs on my i386 testbed have left a
h_ps_strings2 process running after the tests have completed.

The first occurrence was using sources from 2019.12.24.23.41.05,
and in 2020 it has happened in 5 runs out of 11 so far.

This is on real 8-core hardware.  I have not seen it happen in qemu.

The console log output from the first occurrence is here:

  http://www.gson.org/netbsd/bugs/build/i386-baremetal/2019/2019.12.24.23.41.05/test.log

Search for "arg0000" to find the process in case.

>How-To-Repeat:

>Fix: