are there reasons for sun.nio.ch.WindowsSelectorImpl.setWakeupSocket0 to hang

Question

With JDK 1.6.024, we see threads consuming near 100% CPU in setWakeupSocket0() for a socket connection. This native method is called from setWakeupSocket() which in turn is the private part of wakeup() in this particular SelectorImpl. What could cause this method to get stuck for minutes?

Update Feb, 2019: We also see prolonged execution times with late versions JDK 1.8.