required sync added

src/main/java/org/redisson/connection/MasterSlaveEntry.java

@@ -291,9 +291,11 @@ public class MasterSlaveEntry {
                 this.config.getSlaveSubscriptionConnectionMinimumIdleSize(),
                 this.config.getSlaveSubscriptionConnectionPoolSize(), connectionManager, mode);
         if (freezed) {
+            synchronized (entry) {
                 entry.setFreezed(freezed);
                 entry.setFreezeReason(FreezeReason.SYSTEM);
             }
+        }
         return slaveBalancer.add(entry);
     }
 
@@ -350,9 +352,11 @@ public class MasterSlaveEntry {
 
     public void unfreeze() {
         masterEntry.resetFailedAttempts();
+        synchronized (masterEntry) {
             masterEntry.setFreezed(false);
             masterEntry.setFreezeReason(null);
         }
+    }
 
     public void shutdownMasterAsync() {
         if (!active.compareAndSet(true, false)) {