ndb - bug#20185

  second try - handle CS_PREPARE_TO_COMMIT explicitly


storage/ndb/src/kernel/blocks/dbtc/DbtcMain.cpp:
  handle CS_PREPARE_TO_COMMIT explictly

storage/ndb/src/kernel/blocks/dbtc/DbtcMain.cpp

@@ -7093,16 +7093,21 @@ Dbtc::nodeFailCheckTransactions(Signal* signal,
   for (transPtr.i = transPtrI; transPtr.i < capiConnectFilesize; transPtr.i++)
   {
     ptrCheckGuard(transPtr, capiConnectFilesize, apiConnectRecord); 
+    Uiint32 state = transPtr.p->apiConnectstate;
     if (transPtr.p->m_transaction_nodes.get(failedNodeId))
     {
       jam();
       
+      // avoid assertion in timeoutfoundlab
+      if (state != CS_PREPARE_TO_COMMIT)
+      {
 	// Force timeout regardless of state      
 	c_appl_timeout_value = 1;
 	setApiConTimer(transPtr.i, TtcTimer - 2, __LINE__);
 	timeOutFoundLab(signal, transPtr.i, ZNODEFAIL_BEFORE_COMMIT);
 	c_appl_timeout_value = TapplTimeout;
       }
+    }
     
     // Send CONTINUEB to continue later
     signal->theData[0] = TcContinueB::ZNF_CHECK_TRANSACTIONS;