From 7e0fb355e0b04d628d95b1a8e88fe0a3d195002c Mon Sep 17 00:00:00 2001
From: Gary Rong <garyrong0905@gmail.com>
Date: Tue, 3 Mar 2026 12:38:08 -0600
Subject: [PATCH] miner: close the state prefetcher at avoid thread leaks

---
 miner/worker.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/miner/worker.go b/miner/worker.go
index 1f3a3a63bf..e924ca9c86 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -78,6 +78,11 @@ func (env *environment) txFitsSize(tx *types.Transaction) bool {
 	return env.size+tx.Size() < params.MaxBlockSize-maxBlockSizeBufferZone
 }
 
+// discard terminates the background threads before discarding it.
+func (env *environment) discard() {
+	env.state.StopPrefetcher()
+}
+
 const (
 	commitInterruptNone int32 = iota
 	commitInterruptNewHead
@@ -125,6 +130,7 @@ func (miner *Miner) generateWork(genParam *generateParams, witness bool) *newPay
 	if err != nil {
 		return &newPayloadResult{err: err}
 	}
+	defer work.discard()
 
 	// Check withdrawals fit max block size.
 	// Due to the cap on withdrawal count, this can actually never happen, but we still need to