Bug #26825 MySQL Server Crashes in high load

Bug #26997  	mysqld segfault when in single user mode


sql/ha_ndbcluster.cc:
  make sure error is always set even if no proper error code from ndb
storage/ndb/src/ndbapi/NdbDictionaryImpl.cpp:
  add error code for failing send signal (typically single user mode)
storage/ndb/src/ndbapi/ndberror.c:
  added error code for failing send signal and timeout waiting for node failure

sql/ha_ndbcluster.cc

@@ -6093,9 +6093,16 @@ int ndbcluster_discover(handlerton *hton, THD* thd, const char *db,
     {
       const NdbError err= dict->getNdbError();
       if (err.code == 709 || err.code == 723)
+      {
         error= -1;
+        DBUG_PRINT("info", ("ndb_error.code: %u", ndb_error.code));
+      }
       else
+      {
+        error= -1;
         ndb_error= err;
+        DBUG_PRINT("info", ("ndb_error.code: %u", ndb_error.code));
+      }
       goto err;
     }
     DBUG_PRINT("info", ("Found table %s", tab->getName()));

storage/ndb/src/ndbapi/NdbDictionaryImpl.cpp

@@ -1753,6 +1753,7 @@ NdbDictInterface::dictSignal(NdbApiSignal* sig,
 	       m_transporter->sendSignal(sig, node));
     if(res != 0){
       DBUG_PRINT("info", ("dictSignal failed to send signal"));
+      m_error.code = 4007;
       continue;
     }    
     
@@ -1770,6 +1771,7 @@ NdbDictInterface::dictSignal(NdbApiSignal* sig,
      */
     if(ret_val == -2) //WAIT_NODE_FAILURE
     {
+      m_error.code = 4013;
       continue;
     }
     if(m_waiter.m_state == WST_WAIT_TIMEOUT)

storage/ndb/src/ndbapi/ndberror.c

@@ -149,10 +149,12 @@ ErrorBundle ErrorCodes[] = {
   /**
    * Unknown result
    */
+  { 4007, DMEC, UR, "Send to ndbd failed" },
   { 4008, DMEC, UR, "Receive from NDB failed" },
   { 4009, DMEC, UR, "Cluster Failure" },
   { 4012, DMEC, UR, 
     "Request ndbd time-out, maybe due to high load or communication problems"}, 
+  { 4013, DMEC, UR, "Request timed out in waiting for node faiulure"}, 
   { 4024, DMEC, UR, 
     "Time-out, most likely caused by simple read or cluster failure" },