From 1609809fb2a4c2ec15b7c26dc328e2e666bd5d57 Mon Sep 17 00:00:00 2001
From: practicalswift <practicalswift@users.noreply.github.com>
Date: Sun, 12 May 2019 21:48:40 +0200
Subject: [PATCH] validation: Hold cs_main when reading chainActive in
 RewindBlockIndex

---
 src/validation.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/validation.cpp b/src/validation.cpp
index b71e8daf9..3ae2292c3 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -4316,6 +4316,7 @@ bool RewindBlockIndex(const CChainParams& params) {
         return false;
     }
 
+    LOCK(cs_main);
     if (::ChainActive().Tip() != nullptr) {
         // FlushStateToDisk can possibly read ::ChainActive(). Be conservative
         // and skip it here, we're about to -reindex-chainstate anyway, so