kern/55466: can not complete a full test run

[martin%NetBSD.org@localhost]

>Number:         55466
>Category:       kern
>Synopsis:       can not complete a full test run
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 06 15:40:00 +0000 2020
>Originator:     Martin Husemann
>Release:        NetBSD 9.99.69
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD space-truckin.duskware.de 9.99.69 NetBSD 9.99.69 (GENERIC) #90: Mon Jul 6 11:46:24 CEST 2020 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/evbarm/compile/GENERIC evbarm
Architecture: earmv7hfeb
Machine: evbarm
>Description:

When doing a full test run there is a high chance it locks up here:

sbin/ifconfig/t_bridge (542/873): 1 test cases
    manybridges:

top shows a rump_server process busy looping and console is totaly
dead.   

Killing the rump_server process (with -9) unlocks the console again.

If not doing a full test run, but just:

cd /usr/tests/sbin/ifconfig && atf-run t_bridge | atf-report

everything works as expected:
Tests root: /usr/tests/sbin/ifconfig

t_bridge (1/1): 1 test cases
    manybridges: [38.488706s] Passed.
[38.490496s]

Summary for 1 test programs:
    1 passed test cases.
    0 failed test cases.
    0 expected failed test cases.
    0 skipped test cases.


Note that this test does not use RUMP at all, so the leftover rump_server
process must be from some earlier test program.

>How-To-Repeat:
s/a

>Fix:
n/a