core: make txpool operate on immutable state

miner/worker.go

@@ -71,7 +71,6 @@ type Work struct {
 	family    *set.Set       // family set (used for checking uncle invalidity)
 	uncles    *set.Set       // uncle set
 	tcount    int            // tx count in cycle
-	failedTxs types.Transactions
 
 	Block *types.Block // the new block
 
@@ -477,8 +476,6 @@ func (self *worker) commitNewWork() {
 	txs := types.NewTransactionsByPriceAndNonce(pending)
 	work.commitTransactions(self.mux, txs, self.chain, self.coinbase)
 
-	self.eth.TxPool().RemoveBatch(work.failedTxs)
-
 	// compute uncles for the new block.
 	var (
 		uncles    []*types.Header
@@ -563,6 +560,16 @@ func (env *Work) commitTransactions(mux *event.TypeMux, txs *types.TransactionsB
 			log.Trace("Gas limit exceeded for current block", "sender", from)
 			txs.Pop()
 
+		case core.ErrNonceTooLow:
+			// New head notification data race between the transaction pool and miner, shift
+			log.Trace("Skipping transaction with low nonce", "sender", from, "nonce", tx.Nonce())
+			txs.Shift()
+
+		case core.ErrNonceTooHigh:
+			// Reorg notification data race between the transaction pool and miner, skip account =
+			log.Trace("Skipping account with hight nonce", "sender", from, "nonce", tx.Nonce())
+			txs.Pop()
+
 		case nil:
 			// Everything ok, collect the logs and shift in the next transaction from the same account
 			coalescedLogs = append(coalescedLogs, logs...)
@@ -570,10 +577,10 @@ func (env *Work) commitTransactions(mux *event.TypeMux, txs *types.TransactionsB
 			txs.Shift()
 
 		default:
-			// Pop the current failed transaction without shifting in the next from the account
-			log.Trace("Transaction failed, will be removed", "hash", tx.Hash(), "err", err)
-			env.failedTxs = append(env.failedTxs, tx)
-			txs.Pop()
+			// Strange error, discard the transaction and get the next in line (note, the
+			// nonce-too-high clause will prevent us from executing in vain).
+			log.Debug("Transaction failed, account skipped", "hash", tx.Hash(), "err", err)
+			txs.Shift()
 		}
 	}