Fix memory leak in txpool

core/tx_pool.go

@@ -1173,9 +1173,15 @@ func (pool *TxPool) runReorg(done chan struct{}, reset *txpoolResetRequest, dirt
 	// because of another transaction (e.g. higher gas price).
 	if reset != nil {
 		pool.demoteUnexecutables()
-		if reset.newHead != nil && pool.chainconfig.IsLondon(new(big.Int).Add(reset.newHead.Number, big.NewInt(1))) {
-			pendingBaseFee := misc.CalcBaseFee(pool.chainconfig, reset.newHead)
-			pool.priced.SetBaseFee(pendingBaseFee)
+		if reset.newHead != nil {
+			if pool.chainconfig.IsLondon(new(big.Int).Add(reset.newHead.Number, big.NewInt(1))) {
+				// london fork enabled, reset given the base fee
+				pendingBaseFee := misc.CalcBaseFee(pool.chainconfig, reset.newHead)
+				pool.priced.SetBaseFee(pendingBaseFee)
+			} else {
+				// london fork not enabled, reheap to "reset" the priced list
+				pool.priced.Reheap()
+			}
 		}
 	}
 	// Ensure pool.queue and pool.pending sizes stay within the configured limits.