Add statedb error and prefetcher logs (ava-labs#218)

core/blockchain.go

@@ -1078,6 +1078,9 @@ func (bc *BlockChain) insertBlock(block *types.Block, writes bool) error {
 	// transactions and probabilistically some of the account/storage trie nodes.
 	// Process block using the parent state as reference point
 	receipts, logs, usedGas, err := bc.processor.Process(block, parent, statedb, bc.vmConfig)
+	if serr := statedb.Error(); serr != nil {
+		log.Error("statedb error encountered", "err", serr, "number", block.Number(), "hash", block.Hash())
+	}
 	if err != nil {
 		bc.reportBlock(block, receipts, err)
 		return err

core/state/trie_prefetcher.go

@@ -323,7 +323,10 @@ func (sf *subfetcher) loop() {
 					if _, ok := sf.seen[string(task)]; ok {
 						sf.dups++
 					} else {
-						sf.trie.TryGet(task)
+						_, err := sf.trie.TryGet(task)
+						if err != nil {
+							log.Error("Trie prefetcher failed fetching", "root", sf.root, "err", err)
+						}
 						sf.seen[string(task)] = struct{}{}
 					}
 				}