Just a quick blog, so that hopefully when you google for this you will find something and not spend hours debugging it.
I just upgraded to OpenSolaris B123, and everything worked fine, however when I logged out and back in again (something I rarely do, so it might have been present before), the machine was on it's knees. As usual I started the debugging process
show svc.configd at the top
# truss -p `pgrep svc.configd`
just showed it running door_return() a lot. This implies that something is talking to svc.configd.
On reflection I could have dtraced the door_call and door_return calls and gathered the execname of the process it was talking to, but I spotted before that, that my pid values were going up quickly. So clearly there was a process starting up, talking to svc.configd and exiting and repeating.
After a few minutes digging around I found
desktop-print-management-applet calling ospm (OpenSolaris print manager) which was doing svcprop.
A colleague then pointed me to http://defect.opensolaris.org/bz/show_bug.cgi?id=10863 which described the problem and gives a workaround
Fortunately this should be fixed soon