Does time sync cause 'sleep' to hang?

[arb]

A simple csh loop to check on time synchronisation does this:

while (1)
  echo `date` vs `rdate otherhost`
  sleep 2
end

But after some time it just stops working (no more output) and has to be quit with Ctrl-C. The only thing I can think is the sleep has hung due to a time synchronisation event. Does that sound plausible?

Time sync is being performed with this:

VBoxService -v -v -f --enable-timesync --timesync-interval 1000 --timesync-set-threshold 1000 --timesync-set-start

[arb]

It looks as though it's the rdate command which is hanging so maybe my speculation is incorrect.

[Frank Mehnert]

You set the threshold for hard-setting the time to one second. That means that the time will be most likely set very often. If you set the date manually, you will probably experience the same behavior.