[YUNIKORN-2806] Fix deadlock in Preemptor.findEligiblePreemptionVicti…

…ms() (apache#948)

Preemptor.findEligiblePreemptionVictims() needs to disregard apps in the
current queue to avoid a recursive deadlock.

Closes: apache#948

pkg/scheduler/objects/queue.go

@@ -1769,6 +1769,9 @@ func (sq *Queue) findEligiblePreemptionVictims(results map[string]*QueuePreempti
 	if sq == nil {
 		return
 	}
+	if sq.GetQueuePath() == queuePath {
+		return
+	}
 	if sq.IsLeafQueue() {
 		// leaf queue, skip queue if preemption is disabled
 		if sq.GetPreemptionPolicy() == policies.DisabledPreemptionPolicy {