a temp patch for fixing IBD issues for all side-chains

app/protocol/flows/v4/blockrelay/ibd.go

@@ -13,7 +13,9 @@ import (
 	"github.com/kaspanet/kaspad/infrastructure/config"
 	"github.com/kaspanet/kaspad/infrastructure/logger"
 	"github.com/kaspanet/kaspad/infrastructure/network/netadapter/router"
+	"github.com/kaspanet/kaspad/util/difficulty"
 	"github.com/pkg/errors"
+	"math/big"
 	"time"
 )
 
@@ -77,14 +79,37 @@ func (flow *handleIBDFlow) runIBDIfNotRunning(block *externalapi.DomainBlock) er
 	}()
 
 	highHash := consensushashing.BlockHash(block)
-	log.Debugf("IBD started with peer %s and highHash %s", flow.peer, highHash)
-	log.Debugf("Syncing blocks up to %s", highHash)
-	log.Debugf("Trying to find highest shared chain block with peer %s with high hash %s", flow.peer, highHash)
+	log.Criticalf("IBD started with peer %s and highHash %s", flow.peer, highHash)
+	log.Criticalf("Syncing blocks up to %s", highHash)
+	log.Criticalf("Trying to find highest shared chain block with peer %s with high hash %s", flow.peer, highHash)
 	highestSharedBlockHash, highestSharedBlockFound, err := flow.findHighestSharedBlockHash(highHash)
 	if err != nil {
 		return err
 	}
-	log.Debugf("Found highest shared chain block %s with peer %s", highestSharedBlockHash, flow.peer)
+	log.Criticalf("Found highest shared chain block %s with peer %s", highestSharedBlockHash, flow.peer)
+
+	if highestSharedBlockFound {
+		virtualSelectedParent, err := flow.Domain().Consensus().GetVirtualSelectedParent()
+		if err != nil {
+			return err
+		}
+		virtualSelectedParentHeader, err := flow.Domain().Consensus().GetBlockHeader(virtualSelectedParent)
+		if err != nil {
+			return err
+		}
+		if virtualSelectedParentHeader.DAAScore() > block.Header.DAAScore()+2641*3 {
+			virtualDifficulty := difficulty.CalcWork(virtualSelectedParentHeader.Bits())
+			var virtualSub, difficultyMul big.Int
+			if difficultyMul.Mul(virtualDifficulty, big.NewInt(180)).
+				Cmp(virtualSub.Sub(virtualSelectedParentHeader.BlueWork(), block.Header.BlueWork())) < 0 {
+				log.Criticalf("Stopped IBD because it is coming from a deep (%d DAA score depth) "+
+					"side-chain which split at %s and has lower blue work (%d, %d)",
+					virtualSelectedParentHeader.DAAScore()-block.Header.DAAScore(),
+					highestSharedBlockHash, virtualSelectedParentHeader.BlueWork(), block.Header.BlueWork())
+				return nil
+			}
+		}
+	}
 
 	shouldDownloadHeadersProof, shouldSync, err := flow.shouldSyncAndShouldDownloadHeadersProof(block, highestSharedBlockFound)
 	if err != nil {
@@ -324,7 +349,7 @@ func (flow *handleIBDFlow) syncPruningPointFutureHeaders(consensus externalapi.C
 				return nil
 			}
 			for _, header := range ibdBlocksMessage.BlockHeaders {
-				err = flow.processHeader(consensus, header)
+				_, err := flow.processHeader(consensus, header)
 				if err != nil {
 					return err
 				}
@@ -365,7 +390,7 @@ func (flow *handleIBDFlow) receiveHeaders() (msgIBDBlock *appmessage.BlockHeader
 	}
 }
 
-func (flow *handleIBDFlow) processHeader(consensus externalapi.Consensus, msgBlockHeader *appmessage.MsgBlockHeader) error {
+func (flow *handleIBDFlow) processHeader(consensus externalapi.Consensus, msgBlockHeader *appmessage.MsgBlockHeader) (bool, error) {
 	header := appmessage.BlockHeaderToDomainBlockHeader(msgBlockHeader)
 	block := &externalapi.DomainBlock{
 		Header:       header,
@@ -375,27 +400,26 @@ func (flow *handleIBDFlow) processHeader(consensus externalapi.Consensus, msgBlo
 	blockHash := consensushashing.BlockHash(block)
 	blockInfo, err := consensus.GetBlockInfo(blockHash)
 	if err != nil {
-		return err
+		return false, err
 	}
 	if blockInfo.Exists {
 		log.Debugf("Block header %s is already in the DAG. Skipping...", blockHash)
-		return nil
+		return false, nil
 	}
 	_, err = consensus.ValidateAndInsertBlock(block, false)
 	if err != nil {
 		if !errors.As(err, &ruleerrors.RuleError{}) {
-			return errors.Wrapf(err, "failed to process header %s during IBD", blockHash)
+			return false, errors.Wrapf(err, "failed to process header %s during IBD", blockHash)
 		}
 
 		if errors.Is(err, ruleerrors.ErrDuplicateBlock) {
 			log.Debugf("Skipping block header %s as it is a duplicate", blockHash)
 		} else {
 			log.Infof("Rejected block header %s from %s during IBD: %s", blockHash, flow.peer, err)
-			return protocolerrors.Wrapf(true, err, "got invalid block header %s during IBD", blockHash)
+			return false, protocolerrors.Wrapf(true, err, "got invalid block header %s during IBD", blockHash)
 		}
 	}
-
-	return nil
+	return true, nil
 }
 
 func (flow *handleIBDFlow) validatePruningPointFutureHeaderTimestamps() error {