fix cached id data race

data/txHandler.go

@@ -342,6 +342,10 @@ func (handler *TxHandler) backlogWorker() {
 					logging.Base().Warnf("Failed to release capacity to ElasticRateLimiter: %v", err)
 				}
 			}
+			// precompute transaction IDs
+			for i := range wi.unverifiedTxGroup {
+				wi.unverifiedTxGroup[i].CacheID()
+			}
 			if handler.checkAlreadyCommitted(wi) {
 				transactionMessagesAlreadyCommitted.Inc(nil)
 				if wi.capguard != nil {
@@ -531,11 +535,6 @@ func (handler *TxHandler) postProcessCheckedTxn(wi *txBacklogMsg) {
 	// at this point, we've verified the transaction, so we can safely treat the transaction as a verified transaction.
 	verifiedTxGroup := wi.unverifiedTxGroup
 
-	// precompute transaction IDs
-	for i := range verifiedTxGroup {
-		verifiedTxGroup[i].CacheID()
-	}
-
 	// save the transaction, if it has high enough fee and not already in the cache
 	err := handler.txPool.Remember(verifiedTxGroup)
 	if err != nil {