kern/55272: userland watchdog process may be outstalled

[martin%NetBSD.org@localhost]

>Number:         55272
>Category:       kern
>Synopsis:       userland watchdog process may be outstalled
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon May 18 15:55:00 +0000 2020
>Originator:     Martin Husemann
>Release:        NetBSD 9.99.63
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD unpluged.duskware.de 9.99.63 NetBSD 9.99.63 (UNPLUGED) #322: Mon May 18 14:20:23 CEST 2020 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/evbarm/compile/UNPLUGED evbarm
Architecture: earm
Machine: evbarm
>Description:
Since some weeks a userland watchdog with something like:

	wdogctl=YES wdogctl_flags="-u mvsoctmr0"

in /etc/rc.conf may be outstalled by running busy tests, like the libarchive
test program. The timer has 21 second period.

>How-To-Repeat:
See above, just run atf tests (cd /usr/tests && atf-run)

>Fix:
n/a