Merge #11107: Fix races in AppInitMain and others with lock and atomic bools

c626dcb50 Make fUseCrypto atomic (MeshCollider)
731065b11 Consistent parameter names in txdb.h (MeshCollider)
35aeabec6 Make fReindex atomic to avoid race (MeshCollider)
58d91af59 Fix race for mapBlockIndex in AppInitMain (MeshCollider)

Pull request description:

  Fixes https://github.com/bitcoin/bitcoin/issues/11106

  Also makes fReindex atomic as suggested in @TheBlueMatt comment below, and makes fUseCrypto atomic as suggested in 10916

  d291e7635b just renames the parameters in the txdb header file to make them consistent with those used in the cpp file, noticed it when looking for uses of fReindex

Tree-SHA512: b378aa7289fd505b76565cd4d48dcdc04ac5540283ea1c80442170b0f13cb6df771b1a94dd54b7fec3478a7b4668c224ec9d795f16937782724c5d020edd3a42

src/init.cpp

@@ -1643,9 +1643,16 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
 
     // ********************************************************* Step 11: start node
 
+    int chain_active_height;
+
     //// debug print
-    LogPrintf("mapBlockIndex.size() = %u\n",   mapBlockIndex.size());
-    LogPrintf("nBestHeight = %d\n",                   chainActive.Height());
+    {
+        LOCK(cs_main);
+        LogPrintf("mapBlockIndex.size() = %u\n", mapBlockIndex.size());
+        chain_active_height = chainActive.Height();
+    }
+    LogPrintf("nBestHeight = %d\n", chain_active_height);
+
     if (gArgs.GetBoolArg("-listenonion", DEFAULT_LISTEN_ONION))
         StartTorControl(threadGroup, scheduler);
 
@@ -1661,7 +1668,7 @@ bool AppInitMain(boost::thread_group& threadGroup, CScheduler& scheduler)
     connOptions.nMaxOutbound = std::min(MAX_OUTBOUND_CONNECTIONS, connOptions.nMaxConnections);
     connOptions.nMaxAddnode = MAX_ADDNODE_CONNECTIONS;
     connOptions.nMaxFeeler = 1;
-    connOptions.nBestHeight = chainActive.Height();
+    connOptions.nBestHeight = chain_active_height;
     connOptions.uiInterface = &uiInterface;
     connOptions.m_msgproc = peerLogic.get();
     connOptions.nSendBufferMaxSize = 1000*gArgs.GetArg("-maxsendbuffer", DEFAULT_MAXSENDBUFFER);

src/txdb.h

@@ -115,12 +115,12 @@ public:
     CBlockTreeDB& operator=(const CBlockTreeDB&) = delete;
 
     bool WriteBatchSync(const std::vector<std::pair<int, const CBlockFileInfo*> >& fileInfo, int nLastFile, const std::vector<const CBlockIndex*>& blockinfo);
-    bool ReadBlockFileInfo(int nFile, CBlockFileInfo &fileinfo);
+    bool ReadBlockFileInfo(int nFile, CBlockFileInfo &info);
     bool ReadLastBlockFile(int &nFile);
-    bool WriteReindexing(bool fReindex);
-    bool ReadReindexing(bool &fReindex);
+    bool WriteReindexing(bool fReindexing);
+    bool ReadReindexing(bool &fReindexing);
     bool ReadTxIndex(const uint256 &txid, CDiskTxPos &pos);
-    bool WriteTxIndex(const std::vector<std::pair<uint256, CDiskTxPos> > &list);
+    bool WriteTxIndex(const std::vector<std::pair<uint256, CDiskTxPos> > &vect);
     bool WriteFlag(const std::string &name, bool fValue);
     bool ReadFlag(const std::string &name, bool &fValue);
     bool LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex);

src/validation.cpp

@@ -69,7 +69,7 @@ CWaitableCriticalSection csBestBlock;
 CConditionVariable cvBlockChange;
 int nScriptCheckThreads = 0;
 std::atomic_bool fImporting(false);
-bool fReindex = false;
+std::atomic_bool fReindex(false);
 bool fTxIndex = false;
 bool fHavePruned = false;
 bool fPruneMode = false;
@@ -3533,7 +3533,7 @@ bool static LoadBlockIndexDB(const CChainParams& chainparams)
     // Check whether we need to continue reindexing
     bool fReindexing = false;
     pblocktree->ReadReindexing(fReindexing);
-    fReindex |= fReindexing;
+    if(fReindexing) fReindex = true;
 
     // Check whether we have a transaction index
     pblocktree->ReadFlag("txindex", fTxIndex);

src/validation.h

@@ -166,7 +166,7 @@ extern const std::string strMessageMagic;
 extern CWaitableCriticalSection csBestBlock;
 extern CConditionVariable cvBlockChange;
 extern std::atomic_bool fImporting;
-extern bool fReindex;
+extern std::atomic_bool fReindex;
 extern int nScriptCheckThreads;
 extern bool fTxIndex;
 extern bool fIsBareMultisigStd;

src/wallet/crypter.h

@@ -9,6 +9,8 @@
 #include "serialize.h"
 #include "support/allocators/secure.h"
 
+#include <atomic>
+
 const unsigned int WALLET_CRYPTO_KEY_SIZE = 32;
 const unsigned int WALLET_CRYPTO_SALT_SIZE = 8;
 const unsigned int WALLET_CRYPTO_IV_SIZE = 16;
@@ -118,7 +120,7 @@ private:
 
     //! if fUseCrypto is true, mapKeys must be empty
     //! if fUseCrypto is false, vMasterKey must be empty
-    bool fUseCrypto;
+    std::atomic<bool> fUseCrypto;
 
     //! keeps track of whether Unlock has run a thorough check before
     bool fDecryptionThoroughlyChecked;