From e6ff4afa6e2a30843c764987eb3986df699d93f2 Mon Sep 17 00:00:00 2001
From: Jared Wasinger <j-wasinger@hotmail.com>
Date: Fri, 15 Dec 2023 16:29:53 +0800
Subject: [PATCH] make newSubfetcher dump stack trace in debug log

---
 core/state/trie_prefetcher.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/state/trie_prefetcher.go b/core/state/trie_prefetcher.go
index 6ce0e4102a..21c9f1a27f 100644
--- a/core/state/trie_prefetcher.go
+++ b/core/state/trie_prefetcher.go
@@ -17,6 +17,7 @@
 package state
 
 import (
+	"runtime"
 	"sync"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -229,6 +230,10 @@ func newSubfetcher(db Database, state common.Hash, owner common.Hash, root commo
 		term:  make(chan struct{}),
 		seen:  make(map[string]struct{}),
 	}
+        b := make([]byte, 2048) // adjust buffer size to be larger than expected stack
+        n := runtime.Stack(b, false)
+        s := string(b[:n])
+        log.Trace("stack", "trace", s)
 	go sf.loop()
 	return sf
 }