bug#17295 - ndb - error while reading REDO log

  fix corruption due to page 0, file 0 gets released


ndb/src/kernel/blocks/dblqh/DblqhMain.cpp:
  Make sure that page 0, file 0 isnt released

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

@@ -14767,7 +14767,9 @@ void Dblqh::execSr(Signal* signal)
           signal->theData[4] = logFilePtr.p->currentFilepage;
           signal->theData[5] = logFilePtr.p->currentMbyte;
           signal->theData[6] = logPagePtr.p->logPageWord[ZCURR_PAGE_INDEX];
-          sendSignal(cownref, GSN_DEBUG_SIG, signal, 7, JBA);
+	  signal->theData[7] = ~0;
+	  signal->theData[8] = __LINE__;
+          sendSignal(cownref, GSN_DEBUG_SIG, signal, 9, JBA);
           return;
         }//if
       }//if
@@ -14833,7 +14835,8 @@ void Dblqh::execSr(Signal* signal)
       signal->theData[5] = logFilePtr.p->currentFilepage;
       signal->theData[6] = logPagePtr.p->logPageWord[ZCURR_PAGE_INDEX];
       signal->theData[7] = logWord;
-      sendSignal(cownref, GSN_DEBUG_SIG, signal, 8, JBA);
+      signal->theData[8] = __LINE__;
+      sendSignal(cownref, GSN_DEBUG_SIG, signal, 9, JBA);
       return;
       break;
     }//switch
@@ -14862,8 +14865,9 @@ void Dblqh::execDEBUG_SIG(Signal* signal)
 
   char buf[100];
   BaseString::snprintf(buf, 100, 
-	   "Error while reading REDO log.\n"
+	   "Error while reading REDO log. from %d\n"
 	   "D=%d, F=%d Mb=%d FP=%d W1=%d W2=%d",
+	   signal->theData[8],
 	   signal->theData[2], signal->theData[3], signal->theData[4],
 	   signal->theData[5], signal->theData[6], signal->theData[7]);
 
@@ -15439,6 +15443,10 @@ void Dblqh::readSrFourthZeroLab(Signal* signal)
   // to read a page from file. 
   lfoPtr.p->lfoState = LogFileOperationRecord::WRITE_SR_INVALIDATE_PAGES;
 
+  /**
+   * Make sure we dont release zero page
+   */
+  seizeLogpage(signal);
   invalidateLogAfterLastGCI(signal);
   return;
 }//Dblqh::readSrFourthZeroLab()