core: reset txpool state on sethead (#22247)

fixes an issue where local transactions that were included in the chain before a SetHead were rejected if resubmitted, since the txpool had not reset the state to the current (older) state.

core/tx_pool.go

@@ -1137,17 +1137,17 @@ func (pool *TxPool) reset(oldHead, newHead *types.Header) {
 				// head from the chain.
 				// If that is the case, we don't have the lost transactions any more, and
 				// there's nothing to add
-				if newNum < oldNum {
-					// If the reorg ended up on a lower number, it's indicative of setHead being the cause
-					log.Debug("Skipping transaction reset caused by setHead",
-						"old", oldHead.Hash(), "oldnum", oldNum, "new", newHead.Hash(), "newnum", newNum)
-				} else {
+				if newNum >= oldNum {
 					// If we reorged to a same or higher number, then it's not a case of setHead
 					log.Warn("Transaction pool reset with missing oldhead",
 						"old", oldHead.Hash(), "oldnum", oldNum, "new", newHead.Hash(), "newnum", newNum)
-				}
 					return
 				}
+				// If the reorg ended up on a lower number, it's indicative of setHead being the cause
+				log.Debug("Skipping transaction reset caused by setHead",
+					"old", oldHead.Hash(), "oldnum", oldNum, "new", newHead.Hash(), "newnum", newNum)
+				// We still need to update the current state s.th. the lost transactions can be readded by the user
+			} else {
 				for rem.NumberU64() > add.NumberU64() {
 					discarded = append(discarded, rem.Transactions()...)
 					if rem = pool.chain.GetBlock(rem.ParentHash(), rem.NumberU64()-1); rem == nil {
@@ -1177,6 +1177,7 @@ func (pool *TxPool) reset(oldHead, newHead *types.Header) {
 				reinject = types.TxDifference(discarded, included)
 			}
 		}
+	}
 	// Initialize the internal state to the current head
 	if newHead == nil {
 		newHead = pool.chain.CurrentBlock().Header() // Special case during testing