fix: use a named deadline timer in CCC stage

Author: omerfirmak

rollup/pipeline/pipeline.go

@@ -310,15 +310,20 @@ func (p *Pipeline) cccStage(candidates <-chan *BlockCandidate, deadline time.Tim
 	var deadlineReached bool
 
 	go func() {
+		deadlineTimer := time.NewTimer(time.Until(deadline))
 		defer func() {
 			close(resultCh)
+			if !deadlineReached && !deadlineTimer.Stop() {
+				<-deadlineTimer.C
+			}
 			lifetimeTimer.UpdateSince(p.start)
 		}()
 		for {
 			idleStart := time.Now()
 			select {
-			case <-time.After(time.Until(deadline)):
+			case <-deadlineTimer.C:
 				cccIdleTimer.UpdateSince(idleStart)
+				deadlineReached = true
 				// note: currently we don't allow empty blocks, but if we ever do; make sure to CCC check it first
 				if lastCandidate != nil {
 					resultCh <- &Result{
@@ -327,9 +332,6 @@ func (p *Pipeline) cccStage(candidates <-chan *BlockCandidate, deadline time.Tim
 					}
 					return
 				}
-				deadlineReached = true
-				// avoid deadline case being triggered again and again
-				deadline = time.Now().Add(time.Hour)
 			case candidate := <-candidates:
 				cccIdleTimer.UpdateSince(idleStart)
 				cccStart := time.Now()