issue getting plasma6 running on NetBSD

Trying to get plasma6 running on NetBSD and I currently have 1 issue 
that I can't sort out:

Both dolphin and plasmashell have a couple of minute pause at startup 
where they are unresponsive which I have tracked down to the calling of 
/usr/pkg/bin/testparm and /usr/pkg/bin/net from samba4 in kf6-kio's
src/core/ksambashare.cpp

The code should call each program as a subprocess and then parse the 
output  but instead get the output:

QProcess: Destroyed while process ("/usr/pkg/bin/testparm") is still 
running.
QProcess: Destroyed while process ("/usr/pkg/bin/net") is still running.


If I trace dolphin I see it execing testparm at 1.47 seconds in and 
testparm successfully calling exit(0) at 1.50 seconds in
then 30 seconds later dolphin writes the QProcess: Destroyed... and 
executes a kill on the testparm process
then after another 30 seconds repeats the same thing with net (1659)
which again runs to completion in less than a second this time ending 
with an exit(0xffffffff)  and 30 seconds later prints the QProcess: 
Destroyed... and executes a kill on the net process.  30 seconds after 
that dolphin start to respond to inputs.

At no point does dolphin get a SIGCHLD for either process.

ksambashare.cpp is just calling the standard QT process handling:

     QProcess process;
     process.setProcessChannelMode(QProcess::SeparateChannels);
     process.start(fullExecutablePath, args);
     // TODO: make it async in future
     process.waitForFinished();


any ideas?

The full ktrace is at
https://homepages.ecs.vuw.ac.nz/~mark/ktrace.out.xz if you want to see it.


cheers
mark