ndb dd - bug#17536

Fix incorrect assumption that sync(lsn) will be in order
  keep track of max sync(lsn)

storage/ndb/src/kernel/blocks/lgman.cpp

@@ -839,6 +839,7 @@ Lgman::Logfile_group::Logfile_group(const CreateFilegroupImplReq* req)
   m_last_lsn = 0;
   m_last_synced_lsn = 0;
   m_last_sync_req_lsn = 0;
+  m_max_sync_req_lsn = 0;
   m_last_read_lsn = 0;
   m_file_pos[0].m_ptr_i= m_file_pos[1].m_ptr_i = RNIL;
 
@@ -1049,6 +1050,9 @@ Logfile_client::sync_lsn(Signal* signal,
       wait.p->m_sync_lsn= lsn;
       memcpy(&wait.p->m_callback, &req->m_callback, 
 	     sizeof(SimulatedBlock::Callback));
+
+      ptr.p->m_max_sync_req_lsn = lsn > ptr.p->m_max_sync_req_lsn ?
+	lsn : ptr.p->m_max_sync_req_lsn;
     }
     
     if(ptr.p->m_last_sync_req_lsn < lsn && 
@@ -1111,16 +1115,16 @@ Lgman::force_log_sync(Signal* signal,
   }
 
   
-  Ptr<Lgman::Log_waiter> last;
-  if(list.last(last) && 
-     last.p->m_sync_lsn > force_lsn && 
-     ptr.p->m_last_sync_req_lsn < last.p->m_sync_lsn)
+  
+  Uint64 max_req_lsn = ptr.p->m_max_sync_req_lsn;
+  if(max_req_lsn > force_lsn && 
+     max_req_lsn > ptr.p->m_last_sync_req_lsn)
   {
     ndbrequire(ptr.p->m_state & Lgman::Logfile_group::LG_FORCE_SYNC_THREAD);
     signal->theData[0] = LgmanContinueB::FORCE_LOG_SYNC;
     signal->theData[1] = ptr.i;
-    signal->theData[2] = last.p->m_sync_lsn >> 32;
-    signal->theData[3] = last.p->m_sync_lsn & 0xFFFFFFFF;    
+    signal->theData[2] = max_req_lsn >> 32;
+    signal->theData[3] = max_req_lsn & 0xFFFFFFFF;    
     sendSignalWithDelay(reference(), GSN_CONTINUEB, signal, 10, 4);
   }
   else

storage/ndb/src/kernel/blocks/lgman.hpp

@@ -183,8 +183,9 @@ public:
                                   Logfile_group::LG_FLUSH_THREAD;
     
     Uint64 m_last_lsn;
-    Uint64 m_last_sync_req_lsn;
-    Uint64 m_last_synced_lsn;
+    Uint64 m_last_sync_req_lsn; // Outstanding
+    Uint64 m_last_synced_lsn;   // 
+    Uint64 m_max_sync_req_lsn;  // User requested lsn
     union {
       Uint64 m_last_read_lsn;
       Uint64 m_last_lcp_lsn;