Locks fixes:

- trylock for updateDarksendProgress, checkBalanceChanged, "block"
- trylock+wait for UnlockCoins, SendDarksendDenominate, ProcessNewBlock, ActivateBestChain
- move trylock in DoAutomaticDenominating lower

src/darksend.cpp

@@ -432,9 +432,13 @@ bool CDarksendPool::SetCollateralAddress(std::string strAddress){
 // Unlock coins after Darksend fails or succeeds
 //
 void CDarksendPool::UnlockCoins(){
-    LOCK(pwalletMain->cs_wallet);
+    while(true) {
+        TRY_LOCK(pwalletMain->cs_wallet, lockWallet);
+        if(!lockWallet) {MilliSleep(10); continue;}
         BOOST_FOREACH(CTxIn v, lockedCoins)
                 pwalletMain->UnlockCoin(v.prevout);
+        break;
+    }
 
     lockedCoins.clear();
 }
@@ -1155,14 +1159,16 @@ void CDarksendPool::SendDarksendDenominate(std::vector<CTxIn>& vin, std::vector<
 
         LogPrintf("Submitting tx %s\n", tx.ToString());
 
-        {
+        while(true){
-            LOCK(cs_main);
+            TRY_LOCK(cs_main, lockMain);
+            if(!lockMain) { MilliSleep(10); continue;}
             if(!AcceptableInputs(mempool, state, CTransaction(tx), false, NULL, false, true)){
                 LogPrintf("dsi -- transaction not valid! %s \n", tx.ToString());
                 UnlockCoins();
                 SetNull();
                 return;
             }
+            break;
         }
     }
 
@@ -1352,25 +1358,24 @@ void CDarksendPool::ClearLastMessage()
 //
 bool CDarksendPool::DoAutomaticDenominating(bool fDryRun, bool ready)
 {
+    if(!fEnableDarksend) return false;
+    if(fMasterNode) return false;
+    if(state == POOL_STATUS_ERROR || state == POOL_STATUS_SUCCESS) return false;
+    if(GetEntriesCount() > 0) {
+        strAutoDenomResult = _("Mixing in progress...");
+        return false;
+    }
+
     TRY_LOCK(cs_darksend, lockDS);
     if(!lockDS) {
         strAutoDenomResult = _("Lock is already in place.");
         return false;
     }
 
-    LOCK(cs_darksend);
-
     if(!masternodeSync.IsBlockchainSynced()) {
         strAutoDenomResult = _("Can't mix while sync in progress.");
         return false;
     }
-    if(!fEnableDarksend) return false;
-    if(fMasterNode) return false;
-    if(state == POOL_STATUS_ERROR || state == POOL_STATUS_SUCCESS) return false;
-    if(GetEntriesCount() > 0) {
-        strAutoDenomResult = _("Mixing in progress...");
-        return false;
-    }
 
     if (!fDryRun && pwalletMain->IsLocked()){
         strAutoDenomResult = _("Wallet is locked.");

src/main.cpp

@@ -2616,8 +2616,10 @@ bool ActivateBestChain(CValidationState &state, CBlock *pblock) {
         boost::this_thread::interruption_point();
 
         bool fInitialDownload;
-        {
+        while(true) {
-            LOCK(cs_main);
+            TRY_LOCK(cs_main, lockMain);
+            if(!lockMain) { MilliSleep(10); continue; }
+
             pindexMostWork = FindMostWorkChain();
 
             // Whether we have anything to do at all.
@@ -2629,6 +2631,7 @@ bool ActivateBestChain(CValidationState &state, CBlock *pblock) {
 
             pindexNewTip = chainActive.Tip();
             fInitialDownload = IsInitialBlockDownload();
+            break;
         }
         // When we reach this point, we switched to a new tip (stored in pindexNewTip).
 
@@ -3261,8 +3264,10 @@ bool ProcessNewBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, CDis
     // Preliminary checks
     bool checked = CheckBlock(*pblock, state);
 
-    {
+    while(true) {
-        LOCK(cs_main);
+        TRY_LOCK(cs_main, lockMain);
+        if(!lockMain) { MilliSleep(10); continue; }
+
         MarkBlockAsReceived(pblock->GetHash());
         if (!checked) {
             return error("%s : CheckBlock FAILED", __func__);
@@ -3277,6 +3282,7 @@ bool ProcessNewBlock(CValidationState &state, CNode* pfrom, CBlock* pblock, CDis
         CheckBlockIndex();
         if (!ret)
             return error("%s : AcceptBlock FAILED", __func__);
+        break;
     }
 
     if (!ActivateBestChain(state, pblock))
@@ -4876,12 +4882,6 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
         CBlock block;
         vRecv >> block;
 
-        TRY_LOCK(cs_main, lockMainBlock);
-        if(!lockMainBlock && masternodeSync.IsBlockchainSynced()) {
-            LogPrintf("block -- failed to lock cs_main - %s\n", block.GetHash().ToString());
-            return false;
-        }
-
         CInv inv(MSG_BLOCK, block.GetHash());
         LogPrint("net", "received block %s peer=%d\n", inv.hash.ToString(), pfrom->id);
 
@@ -4894,7 +4894,8 @@ bool static ProcessMessage(CNode* pfrom, string strCommand, CDataStream& vRecv,
             pfrom->PushMessage("reject", strCommand, state.GetRejectCode(),
                                state.GetRejectReason().substr(0, MAX_REJECT_MESSAGE_LENGTH), inv.hash);
             if (nDoS > 0) {
-                Misbehaving(pfrom->GetId(), nDoS);
+                TRY_LOCK(cs_main, lockMain);
+                if(lockMain) Misbehaving(pfrom->GetId(), nDoS);
             }
         }
 

src/qt/overviewpage.cpp

@@ -318,11 +318,10 @@ void OverviewPage::updateDarksendProgress()
 
     if(!pwalletMain) return;
 
-    int64_t nBalance = pwalletMain->GetBalance();
     QString strAmountAndRounds;
     QString strAnonymizeDarkcoinAmount = BitcoinUnits::formatHtmlWithUnit(nDisplayUnit, nAnonymizeDarkcoinAmount * COIN, false, BitcoinUnits::separatorAlways);
 
-    if(nBalance == 0)
+    if(currentBalance == 0)
     {
         ui->darksendProgress->setValue(0);
         ui->darksendProgress->setToolTip(tr("No inputs detected"));
@@ -336,9 +335,24 @@ void OverviewPage::updateDarksendProgress()
         return;
     }
 
-    int64_t nDenominatedUnconfirmedBalance = pwalletMain->GetDenominatedBalance(true);
+    CAmount nDenominatedConfirmedBalance;
-    int64_t nMaxToAnonymize = pwalletMain->GetAnonymizableBalance() +
+    CAmount nDenominatedUnconfirmedBalance;
-            pwalletMain->GetAnonymizedBalance() + nDenominatedUnconfirmedBalance;
+    CAmount nAnonymizableBalance;
+    CAmount nNormalizedAnonymizedBalance;
+    double nAverageAnonymizedRounds;
+
+    {
+        TRY_LOCK(cs_main, lockMain);
+        if(!lockMain) return;
+
+        nDenominatedConfirmedBalance = pwalletMain->GetDenominatedBalance();
+        nDenominatedUnconfirmedBalance = pwalletMain->GetDenominatedBalance(true);
+        nAnonymizableBalance = pwalletMain->GetAnonymizableBalance();
+        nNormalizedAnonymizedBalance = pwalletMain->GetNormalizedAnonymizedBalance();
+        nAverageAnonymizedRounds = pwalletMain->GetAverageAnonymizedRounds();
+    }
+
+    CAmount nMaxToAnonymize = nAnonymizableBalance + currentAnonymizedBalance + nDenominatedUnconfirmedBalance;
 
     // If it's more than the anon threshold, limit to that.
     if(nMaxToAnonymize > nAnonymizeDarkcoinAmount*COIN) nMaxToAnonymize = nAnonymizeDarkcoinAmount*COIN;
@@ -371,16 +385,16 @@ void OverviewPage::updateDarksendProgress()
     // completeness of full amount anonimization
     float anonFullPart = 0;
 
-    int64_t denominatedBalance = pwalletMain->GetDenominatedBalance() + nDenominatedUnconfirmedBalance;
+    CAmount denominatedBalance = nDenominatedConfirmedBalance + nDenominatedUnconfirmedBalance;
     denomPart = (float)denominatedBalance / nMaxToAnonymize;
     denomPart = denomPart > 1 ? 1 : denomPart;
     denomPart *= 100;
 
-    anonNormPart = (float)pwalletMain->GetNormalizedAnonymizedBalance() / nMaxToAnonymize;
+    anonNormPart = (float)nNormalizedAnonymizedBalance / nMaxToAnonymize;
     anonNormPart = anonNormPart > 1 ? 1 : anonNormPart;
     anonNormPart *= 100;
 
-    anonFullPart = (float)pwalletMain->GetAnonymizedBalance() / nMaxToAnonymize;
+    anonFullPart = (float)currentAnonymizedBalance / nMaxToAnonymize;
     anonFullPart = anonFullPart > 1 ? 1 : anonFullPart;
     anonFullPart *= 100;
 
@@ -404,7 +418,7 @@ void OverviewPage::updateDarksendProgress()
                           tr("Anonymized") + ": %4%<br/>" +
                           tr("Denominated inputs have %5 of %n rounds on average", "", nDarksendRounds))
             .arg(progress).arg(denomPart).arg(anonNormPart).arg(anonFullPart)
-            .arg(pwalletMain->GetAverageAnonymizedRounds());
+            .arg(nAverageAnonymizedRounds);
     ui->darksendProgress->setToolTip(strToolPip);
 }
 
@@ -486,7 +500,7 @@ void OverviewPage::toggleDarksend(){
         settings.setValue("hasMixed", "hasMixed");
     }
     if(!fEnableDarksend){
-        int64_t balance = pwalletMain->GetBalance();
+        int64_t balance = currentBalance;
         float minAmount = 1.49 * COIN;
         if(balance < minAmount){
             QString strMinAmount(BitcoinUnits::formatWithUnit(nDisplayUnit, minAmount));

src/qt/sendcoinsdialog.cpp

@@ -580,6 +580,9 @@ void SendCoinsDialog::setBalance(const CAmount& balance, const CAmount& unconfir
 
 void SendCoinsDialog::updateDisplayUnit()
 {
+    TRY_LOCK(cs_main, lockMain);
+    if(!lockMain) return;
+
     setBalance(model->getBalance(), model->getUnconfirmedBalance(), model->getImmatureBalance(), model->getAnonymizedBalance(),
                    model->getWatchBalance(), model->getWatchUnconfirmedBalance(), model->getWatchImmatureBalance());
     CoinControlDialog::coinControl->useDarkSend = ui->checkUseDarksend->isChecked();

src/qt/walletmodel.cpp

@@ -146,6 +146,9 @@ void WalletModel::pollBalanceChanged()
 
 void WalletModel::checkBalanceChanged()
 {
+    TRY_LOCK(cs_main, lockMain);
+    if(!lockMain) return;
+
     CAmount newBalance = getBalance();
     CAmount newUnconfirmedBalance = getUnconfirmedBalance();
     CAmount newImmatureBalance = getImmatureBalance();