From b8ee2877c5433924f78258e7e89fd74b6f97cd59 Mon Sep 17 00:00:00 2001
From: Daniel Katzan <108216499+dkatzan@users.noreply.github.com>
Date: Tue, 6 Jun 2023 11:29:41 +0300
Subject: [PATCH] core/txpool: fix minor flaw in isGapped check (#27404)

This fix a minor implementation issue with the newly introduced isGapped function and it is described in ticket: https://github.com/ethereum/go-ethereum/issues/27401
---
 core/txpool/txpool.go | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/core/txpool/txpool.go b/core/txpool/txpool.go
index cbb8cc287a..ba71dfa88a 100644
--- a/core/txpool/txpool.go
+++ b/core/txpool/txpool.go
@@ -823,10 +823,12 @@ func (pool *TxPool) add(tx *types.Transaction, local bool) (replaced bool, err e
 
 // isGapped reports whether the given transaction is immediately executable.
 func (pool *TxPool) isGapped(from common.Address, tx *types.Transaction) bool {
-	// Short circuit if transaction matches pending nonce and can be promoted
-	// to pending list as an executable transaction.
+	// Short circuit if transaction falls within the scope of the pending list
+	// or matches the next pending nonce which can be promoted as an executable
+	// transaction afterwards. Note, the tx staleness is already checked in
+	// 'validateTx' function previously.
 	next := pool.pendingNonces.get(from)
-	if tx.Nonce() == next {
+	if tx.Nonce() <= next {
 		return false
 	}
 	// The transaction has a nonce gap with pending list, it's only considered