resolve keefe's comment

core/blockchain.go

@@ -602,6 +602,8 @@ func (bc *BlockChain) tryRewindBadBlocks() {
 		log.Warn("current block verified failed, rewind to its parent", "height", block.NumberU64(), "hash", block.Hash())
 		bc.futureBlocks.Remove(block.Hash())
 		bc.badBlockCache.Add(block.Hash(), time.Now())
+		bc.diffLayerCache.Remove(block.Hash())
+		bc.diffLayerRLPCache.Remove(block.Hash())
 		bc.reportBlock(block, nil, errStateRootVerificationFailed)
 		bc.setHeadBeyondRoot(block.NumberU64()-1, common.Hash{})
 	}

core/state/statedb.go

@@ -172,10 +172,7 @@ func newStateDB(root common.Hash, db Database, snaps *snapshot.Tree) (*StateDB,
 	tr, err := db.OpenTrie(root)
 	// return error when 1. failed to open trie and 2. the snap is not nil and done verification
 	if err != nil && (sdb.snap == nil || snapVerified) {
-		if err != nil {
-			return nil, err
-		}
-		return nil, fmt.Errorf("no available state")
+		return nil, err
 	}
 	sdb.trie = tr
 	return sdb, nil