validation: Pass in chainman to UnloadBlockIndex

src/init.cpp

@@ -1559,7 +1559,7 @@ bool AppInitMain(const util::Ref& context, NodeContext& node, interfaces::BlockA
                 chainman.m_total_coinstip_cache = nCoinCacheUsage;
                 chainman.m_total_coinsdb_cache = nCoinDBCache;
 
-                UnloadBlockIndex(node.mempool.get());
+                UnloadBlockIndex(node.mempool.get(), chainman);
 
                 // new CBlockTreeDB tries to delete the existing file, which
                 // fails if it's still open from the previous loop. Close it first:

src/qt/test/apptests.cpp

@@ -84,8 +84,11 @@ void AppTests::appTests()
     // Reset global state to avoid interfering with later tests.
     LogInstance().DisconnectTestLogger();
     AbortShutdown();
-    UnloadBlockIndex(/* mempool */ nullptr);
-    WITH_LOCK(::cs_main, g_chainman.Reset());
+    {
+        LOCK(cs_main);
+        UnloadBlockIndex(/* mempool */ nullptr, g_chainman);
+        g_chainman.Reset();
+    }
 }
 
 //! Entry point for BitcoinGUI tests.

src/test/util/setup_common.cpp

@@ -187,7 +187,7 @@ TestingSetup::~TestingSetup()
     m_node.connman.reset();
     m_node.banman.reset();
     m_node.args = nullptr;
-    UnloadBlockIndex(m_node.mempool.get());
+    UnloadBlockIndex(m_node.mempool.get(), *m_node.chainman);
     m_node.mempool.reset();
     m_node.scheduler.reset();
     m_node.chainman->Reset();

src/validation.cpp

@@ -4605,10 +4605,10 @@ void CChainState::UnloadBlockIndex() {
 // May NOT be used after any connections are up as much
 // of the peer-processing logic assumes a consistent
 // block index state
-void UnloadBlockIndex(CTxMemPool* mempool)
+void UnloadBlockIndex(CTxMemPool* mempool, ChainstateManager& chainman)
 {
     LOCK(cs_main);
-    g_chainman.Unload();
+    chainman.Unload();
     pindexBestInvalid = nullptr;
     pindexBestHeader = nullptr;
     if (mempool) mempool->clear();

src/validation.h

@@ -159,7 +159,7 @@ void LoadExternalBlockFile(const CChainParams& chainparams, FILE* fileIn, FlatFi
 /** Ensures we have a genesis block in the block tree, possibly writing one to disk. */
 bool LoadGenesisBlock(const CChainParams& chainparams);
 /** Unload database information */
-void UnloadBlockIndex(CTxMemPool* mempool);
+void UnloadBlockIndex(CTxMemPool* mempool, ChainstateManager& chainman);
 /** Run an instance of the script checking thread */
 void ThreadScriptCheck(int worker_num);
 /**