Reduce chances of deadlock in the scheduler

tasks/exec.go

@@ -26,7 +26,7 @@ func executeEnable() {
 		if notiferCh != nil {
 			go func() {
 				for val := range notiferCh {
-					tryBeginTask(int(val), true)
+					go tryBeginTask(int(val), true)
 				}
 				notiferCh = nil
 			}()

tasks/schedule.go

@@ -124,7 +124,7 @@ func scheduleUnfinished() {
 		return
 	}
 	for _, task := range tasks {
-		beginTask(task)
+		go beginTask(task)
 	}
 }