port-evbarm/55504: evbarm-earmv7hf testbed hangs during sbin/ifconfig/t_repeated_updown test

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

>Number:         55504
>Category:       port-evbarm
>Synopsis:       evbarm-earmv7hf testbed hangs during sbin/ifconfig/t_repeated_updown test
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-evbarm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 20 18:35:00 +0000 2020
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= c. 2020.06.26.10.14.32
>Organization:
  
>Environment:
System: NetBSD
Architecture: earmv7hf
Machine: evbarm
>Description:

The TNF evbarm-earmv7hf testbed is failing to complete the ATF tests
because the system under test hangs at the repeated_updown test case
of the sbin/ifconfig/t_repeated_updown test.  This has presumably been
the case since the test was added on source date 2020.06.25.15.41.40,
buth because the test was added while the build was broken, the first
test run demonstrating the problem was with sources from 2020.06.26.10.14.32:

  http://releng.netbsd.org/b5reports/evbarm-earmv7hf/commits-2020.06.html#2020.06.26.10.14.32

>How-To-Repeat:

>Fix: