From 2b0f56898d233cefee3b17e8ad61529660f5cd92 Mon Sep 17 00:00:00 2001
From: Larry <92799281+brilliant-lx@users.noreply.github.com>
Date: Sun, 16 Apr 2023 15:36:52 +0800
Subject: [PATCH] fix: panic on using WaitGroup after it is freed (#1464)

---
 core/blockchain.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/core/blockchain.go b/core/blockchain.go
index 43d899d77e..c67ceb2097 100644
--- a/core/blockchain.go
+++ b/core/blockchain.go
@@ -1584,18 +1584,20 @@ func (bc *BlockChain) writeBlockWithState(block *types.Block, receipts []*types.
 					}
 				}
 				// Garbage collect anything below our required write retention
+				wg2 := sync.WaitGroup{}
 				for !bc.triegc.Empty() {
 					root, number := bc.triegc.Pop()
 					if uint64(-number) > chosen {
 						bc.triegc.Push(root, number)
 						break
 					}
-					wg.Add(1)
+					wg2.Add(1)
 					go func() {
 						triedb.Dereference(root.(common.Hash))
-						wg.Done()
+						wg2.Done()
 					}()
 				}
+				wg2.Wait()
 			}
 		}
 		return nil