Fix: Panic due to concurrent map r/w

statemdl/state.go

@@ -392,6 +392,12 @@ func collectStatistics() {
 	clientResponseData.ServicesState = stateCache
 	clientResponseData.QueryState = queryCache
 
+	// the marshall function reads data from clientResponseData.ServicesState and clientResponseData.QueryState
+	// as both are maps, we have passed a referrence of stateCache and queryCache respectively.
+	// The following lock guards these two underlying data structures.
+	stateMutex.Lock()
+	defer stateMutex.Unlock()
+
 	ba, marshalError := ffjson.Marshal(clientResponseData)
 	if errormdl.CheckErr(marshalError) != nil {
 		loggermdl.LogError(marshalError)