BUG #19146 If Backup parameters incorrectly set, the data nodes can't start.

storage/ndb/src/kernel/blocks/backup/Backup.cpp:
  If FailedToSetupFsBuffers in BACKUP block, it will send back DEFINE_BACKUP_REF to LQH.
storage/ndb/src/kernel/blocks/dblqh/DblqhMain.cpp:
  If get DEFINE_BACKUP_REF signal , LQH will crash and give some messages in error log.

storage/ndb/src/kernel/blocks/backup/Backup.cpp

@@ -2387,6 +2387,18 @@ Backup::defineBackupRef(Signal* signal, BackupRecordPtr ptr, Uint32 errCode)
   if(ptr.p->is_lcp()) 
   {
     jam();
+     if (ptr.p->ctlFilePtr == RNIL) {
+       ptr.p->m_gsn = GSN_DEFINE_BACKUP_REF;
+       ndbrequire(ptr.p->errorCode != 0);
+       DefineBackupRef* ref = (DefineBackupRef*)signal->getDataPtrSend();
+       ref->backupId = ptr.p->backupId;
+       ref->backupPtr = ptr.i;
+       ref->errorCode = ptr.p->errorCode;
+       ref->nodeId = getOwnNodeId();
+       sendSignal(ptr.p->masterRef, GSN_DEFINE_BACKUP_REF, signal,
+                  DefineBackupRef::SignalLength, JBB);
+       return;
+     }
 
     BackupFilePtr filePtr LINT_SET_PTR;
     ptr.p->files.getPtr(filePtr, ptr.p->ctlFilePtr);

storage/ndb/src/kernel/blocks/dblqh/DblqhMain.cpp

@@ -566,6 +566,26 @@ Dblqh::execDEFINE_BACKUP_REF(Signal* signal)
 {
   jamEntry();
   m_backup_ptr = RNIL;
+  DefineBackupRef* ref = (DefineBackupRef*)signal->getDataPtrSend();
+  int err_code = 0;
+  char * extra_msg = NULL;
+
+  switch(ref->errorCode){
+    case DefineBackupRef::Undefined:
+    case DefineBackupRef::FailedToSetupFsBuffers:
+    case DefineBackupRef::FailedToAllocateBuffers: 
+    case DefineBackupRef::FailedToAllocateTables: 
+    case DefineBackupRef::FailedAllocateTableMem: 
+    case DefineBackupRef::FailedToAllocateFileRecord:
+    case DefineBackupRef::FailedToAllocateAttributeRecord:
+    case DefineBackupRef::FailedInsertFileHeader: 
+    case DefineBackupRef::FailedInsertTableList: 
+      jam();
+      err_code = NDBD_EXIT_INVALID_CONFIG;
+      extra_msg = "Probably Backup parameters configuration error, Please consult the manual";
+      progError(__LINE__, err_code, extra_msg);
+  }
+
   sendsttorryLab(signal);
 }