fix(miner): avoid XDPoS-only paths on non-XDPoS engines

miner/worker.go

@@ -248,6 +248,15 @@ func (w *worker) start() {
 	for agent := range w.agents {
 		agent.Start()
 	}
+
+	// Verify config and engine
+	var xdposEngine *XDPoS.XDPoS
+	if engine, ok := w.engine.(*XDPoS.XDPoS); ok {
+		xdposEngine = engine
+	}
+	if w.config != nil && w.config.XDPoS != nil && xdposEngine == nil {
+		log.Warn("XDPoS config enabled but consensus engine is not XDPoS")
+	}
 }
 
 func (w *worker) stop() {
@@ -287,8 +296,12 @@ func (w *worker) update() {
 
 	// timeout waiting for v1 initial value
 	minePeriod := 2
-	MinePeriodCh := w.engine.(*XDPoS.XDPoS).MinePeriodCh
-	NewRoundCh := w.engine.(*XDPoS.XDPoS).NewRoundCh
+	var minePeriodCh <-chan int
+	var newRoundCh <-chan types.Round
+	if xdposEngine, ok := w.engine.(*XDPoS.XDPoS); ok {
+		minePeriodCh = xdposEngine.MinePeriodCh
+		newRoundCh = xdposEngine.NewRoundCh
+	}
 
 	timeout := time.NewTimer(time.Duration(minePeriod) * time.Second)
 	defer timeout.Stop()
@@ -321,7 +334,7 @@ func (w *worker) update() {
 	for {
 		// A real event arrived, process interesting content
 		select {
-		case v := <-MinePeriodCh:
+		case v := <-minePeriodCh:
 			log.Info("[worker] update wait period", "period", v)
 			minePeriod = v
 			w.resetCh <- time.Duration(minePeriod) * time.Second
@@ -340,7 +353,7 @@ func (w *worker) update() {
 			w.resetCh <- resetTime
 
 		// Handle new round
-		case <-NewRoundCh:
+		case <-newRoundCh:
 			w.commitNewWork()
 			resetTime := getResetTime(w.chain, minePeriod)
 			w.resetCh <- resetTime
@@ -664,21 +677,28 @@ func (w *worker) checkPreCommitWithLock() (*types.Block, bool) {
 // checkPreCommit checks whether a new work commit is needed,
 // returns the parent block and shouldReturn.
 func (w *worker) checkPreCommit() (*types.Block, bool) {
-	c := w.engine.(*XDPoS.XDPoS)
+	var xdposEngine *XDPoS.XDPoS
+	if engine, ok := w.engine.(*XDPoS.XDPoS); ok {
+		xdposEngine = engine
+	}
 	var parent *types.Block
 	currentHeader := w.chain.CurrentBlock()
 	// Guard against nil header (early startup or uninitialised chain).
 	if currentHeader == nil {
 		return nil, true
 	}
-	if c != nil {
-		parent = c.FindParentBlockToAssign(w.chain, currentHeader)
+	if xdposEngine != nil {
+		parent = xdposEngine.FindParentBlockToAssign(w.chain, currentHeader)
 	} else {
 		parent = w.chain.GetBlock(currentHeader.Hash(), currentHeader.Number.Uint64())
 	}
 	if parent == nil {
 		return nil, true
 	}
+	if w.config.XDPoS != nil && xdposEngine == nil {
+		log.Debug("XDPoS config enabled but consensus engine is not XDPoS")
+		return parent, true
+	}
 	if parent.Hash().Hex() == w.lastParentBlockCommit {
 		return parent, true
 	}
@@ -689,8 +709,8 @@ func (w *worker) checkPreCommit() (*types.Block, bool) {
 	// Only try to commit new work if we are mining
 	if atomic.LoadInt32(&w.mining) == 1 {
 		// check if we are right after parent's coinbase in the list
-		if w.config.XDPoS != nil {
-			ok, err := c.YourTurn(w.chain, parent.Header(), w.coinbase)
+		if w.config.XDPoS != nil && xdposEngine != nil {
+			ok, err := xdposEngine.YourTurn(w.chain, parent.Header(), w.coinbase)
 			if err != nil {
 				log.Warn("Failed when trying to commit new work", "err", err)
 				return parent, true

miner/worker_test.go

@@ -0,0 +1,132 @@
+// Copyright 2026 The XDPoSChain Authors
+// This file is part of the XDPoSChain library.
+//
+// The XDPoSChain library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The XDPoSChain library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the XDPoSChain library. If not, see <http://www.gnu.org/licenses/>.
+
+package miner
+
+import (
+	"math/big"
+	"testing"
+	"time"
+
+	"github.com/XinFinOrg/XDPoSChain/common"
+	"github.com/XinFinOrg/XDPoSChain/consensus/XDPoS/utils"
+	"github.com/XinFinOrg/XDPoSChain/consensus/ethash"
+	"github.com/XinFinOrg/XDPoSChain/core"
+	"github.com/XinFinOrg/XDPoSChain/core/rawdb"
+	"github.com/XinFinOrg/XDPoSChain/core/types"
+	"github.com/XinFinOrg/XDPoSChain/core/vm"
+	"github.com/XinFinOrg/XDPoSChain/event"
+	"github.com/XinFinOrg/XDPoSChain/params"
+)
+
+func newBlockingSubscription() event.Subscription {
+	return event.NewSubscription(func(unsub <-chan struct{}) error {
+		<-unsub
+		return nil
+	})
+}
+
+func TestWorkerUpdateNonXDPoSStaysRunning(t *testing.T) {
+	worker := &worker{
+		engine:       ethash.NewFaker(),
+		chainHeadSub: newBlockingSubscription(),
+		chainSideSub: newBlockingSubscription(),
+		resetCh:      make(chan time.Duration, 1),
+	}
+
+	done := make(chan struct{})
+	started := make(chan struct{})
+	go func() {
+		close(started)
+		worker.update()
+		close(done)
+	}()
+	select {
+	case <-started:
+		// worker.update has started; proceed with timing checks.
+	case <-time.After(time.Second):
+		t.Fatal("worker.update did not start in time")
+	}
+
+	select {
+	case <-done:
+		t.Fatal("worker.update returned before unsubscribe")
+	default:
+		// Expected: update is still running until subscription error.
+	}
+	worker.chainHeadSub.Unsubscribe()
+
+	select {
+	case <-done:
+		// Expected: update exits after subscription error.
+	case <-time.After(time.Second):
+		t.Fatal("worker.update did not return after unsubscribe")
+	}
+}
+
+func TestWorkerCheckPreCommitXDPoSMismatch(t *testing.T) {
+	config := &params.ChainConfig{
+		ChainID: big.NewInt(1),
+		XDPoS: &params.XDPoSConfig{
+			V2: &params.V2{
+				SwitchBlock: big.NewInt(0),
+				AllConfigs: map[uint64]*params.V2Config{
+					0: {MinePeriod: 2},
+				},
+			},
+		},
+	}
+	signer := common.HexToAddress("0x0000000000000000000000000000000000000001")
+	extraData := make([]byte, 0, utils.ExtraVanity+common.AddressLength+utils.ExtraSeal)
+	extraData = append(extraData, make([]byte, utils.ExtraVanity)...)
+	extraData = append(extraData, signer.Bytes()...)
+	extraData = append(extraData, make([]byte, utils.ExtraSeal)...)
+	genesis := &core.Genesis{
+		Config:     config,
+		GasLimit:   params.TargetGasLimit,
+		Difficulty: big.NewInt(1),
+		Alloc:      types.GenesisAlloc{},
+		ExtraData:  extraData,
+	}
+	db := rawdb.NewMemoryDatabase()
+	if _, err := genesis.Commit(db); err != nil {
+		t.Fatalf("failed to commit genesis: %v", err)
+	}
+	engine := ethash.NewFaker()
+	chain, err := core.NewBlockChain(db, nil, genesis, engine, vm.Config{})
+	if err != nil {
+		t.Fatalf("failed to create blockchain: %v", err)
+	}
+	defer chain.Stop()
+
+	worker := &worker{
+		config:      config,
+		engine:      engine,
+		chain:       chain,
+		announceTxs: true,
+	}
+
+	parent, shouldReturn := worker.checkPreCommitWithLock()
+	if parent == nil {
+		t.Fatal("expected parent block, got nil")
+	}
+	if !shouldReturn {
+		t.Fatal("expected checkPreCommitWithLock to skip when XDPoS config is enabled but engine is not XDPoS")
+	}
+	if parent.Number().Sign() != 0 {
+		t.Fatalf("expected genesis parent, got number %v", parent.Number())
+	}
+}