(now I just need to find out why 'courierldapaliasd' is consuming ~50% of
my CPU, even though 'truss -f' only shows it sleeping...)
That means that the process is stuck in an internal infinite loop.
Definitely not good.
Is this a known problem, or just something out of whack on my box? Is
there something I can do to isolate the cause?
I have not heard of this before. To isolate the cause, compile with the -g
flag, and manually install courierldapaliasd by hand. Then you should be
able to attach a debugger to the process and get a stack traceback.