bin/52121: tests/dev/md does only work when the host has /dev/rmd* configured?

[martin%NetBSD.org@localhost]

>Number:         52121
>Category:       bin
>Synopsis:       tests/dev/md does only work when the host has /dev/rmd* configured?
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Mar 28 12:35:00 +0000 2017
>Originator:     Martin Husemann
>Release:        NetBSD 7.99.66
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD unpluged.duskware.de 7.99.66 NetBSD 7.99.66 (UNPLUGED) #54: Tue Mar 28 08:46:55 CEST 2017 martin%martins.aprisoft.de@localhost:/ssd/src/sys/arch/evbarm/compile/UNPLUGED evbarm
Architecture: earm
Machine: evbarm
>Description:

The rump test tests/dev/md fails on machines (like evbarm) that have no md(4)
driver configured. This is strange, as it explicitly fires up a rump server
for it (h_mdserv) and talks to that.

Maybe that servers rumps are misconfigured?

>How-To-Repeat:

# cat /dev/rmd0c 
cat: /dev/rmd0c: Device not configured

cd /usr/tests/dev/md
atf-run | atf-report

says:

Tests root: /usr/tests/dev/md

t_md (1/1): 1 test cases
    basic: [0.859533s] Failed: atf-check failed; see the output of the test for details
[0.863682s]


test output from running the helper rump daemon:

tc-so:Executing command [ /usr/tests/dev/md/h_mdserv /dev/rmd0c ]
tc-se:Fail: incorrect exit status: 22, expected: 0


>Fix:
n/a