Fix incorrect balance when CreateContract is used in block-stm (ethereum#1382)

* Fix incorrect balance when CreateContract is used in block-stm

* address CR comments

Author: cffls

core/state/statedb.go

@@ -418,7 +418,6 @@ func (s *StateDB) ApplyMVWriteSet(writes []blockstm.WriteDescriptor) {
 
 			switch path.GetSubpath() {
 			case BalancePath:
-				// todo: @anshalshukla || @cffls - check balance change reason
 				s.SetBalance(addr, sr.GetBalance(addr), tracing.BalanceChangeUnspecified)
 			case NoncePath:
 				s.SetNonce(addr, sr.GetNonce(addr))
@@ -1095,9 +1094,6 @@ func (s *StateDB) createObject(addr common.Address) *stateObject {
 // consensus bug eventually.
 func (s *StateDB) CreateAccount(addr common.Address) {
 	s.createObject(addr)
-	// todo: @anshalshukla || @cffls
-	// Check the below MV Write, balance path change have been removed
-	MVWrite(s, blockstm.NewAddressKey(addr))
 }
 
 // CreateContract is used whenever a contract is created. This may be preceded
@@ -1107,13 +1103,14 @@ func (s *StateDB) CreateAccount(addr common.Address) {
 // correctly handle EIP-6780 'delete-in-same-transaction' logic.
 func (s *StateDB) CreateContract(addr common.Address) {
 	obj := s.getStateObject(addr)
+	if obj != nil {
+		obj = s.mvRecordWritten(obj)
+	}
 	if !obj.newContract {
 		obj.newContract = true
 		s.journal.append(createContractChange{account: addr})
 	}
 
-	// todo: @anshalshukla || @cffls
-	// Check the below MV Write, balance path change have been removed
 	MVWrite(s, blockstm.NewAddressKey(addr))
 }
 

core/state/statedb_test.go

@@ -813,6 +813,33 @@ func TestMVHashMapReadWriteDelete(t *testing.T) {
 	assert.Equal(t, uint256.NewInt(0), b)
 }
 
+func TestMVHashMapCreateContract(t *testing.T) {
+	t.Parallel()
+
+	db := NewDatabase(rawdb.NewMemoryDatabase())
+	mvhm := blockstm.MakeMVHashMap()
+	s, _ := NewWithMVHashmap(common.Hash{}, db, nil, mvhm)
+
+	states := []*StateDB{s}
+
+	// Create copies of the original state for each transition
+	for i := 1; i <= 4; i++ {
+		sCopy := s.Copy()
+		sCopy.txIndex = i
+		states = append(states, sCopy)
+	}
+
+	addr := common.HexToAddress("0x01")
+	states[0].SetBalance(addr, uint256.NewInt(100), tracing.BalanceChangeTransfer)
+	states[0].FlushMVWriteSet()
+
+	states[1].CreateContract(addr)
+	states[1].FlushMVWriteSet()
+
+	b := states[1].GetBalance(addr)
+	assert.Equal(t, uint256.NewInt(100), b)
+}
+
 func TestMVHashMapRevert(t *testing.T) {
 	t.Parallel()