diff --git a/myisam/mi_rkey.c b/myisam/mi_rkey.c
index 70122288d6c..41c2e173b70 100644
--- a/myisam/mi_rkey.c
+++ b/myisam/mi_rkey.c
@@ -66,6 +66,7 @@ int mi_rkey(MI_INFO *info, byte *buf, int inx, const byte *key, uint key_len,
 
   if (fast_mi_readinfo(info))
     goto err;
+
   if (share->concurrent_insert)
     rw_rdlock(&share->key_root_lock[inx]);
 
@@ -77,14 +78,24 @@ int mi_rkey(MI_INFO *info, byte *buf, int inx, const byte *key, uint key_len,
   if (!_mi_search(info,keyinfo, key_buff, use_key_length,
 		  myisam_read_vec[search_flag], info->s->state.key_root[inx]))
   {
-    while (info->lastpos >= info->state->data_file_length)
+    /*
+      If we are searching for an exact key (including the data pointer)
+      and this was added by an concurrent insert,
+      then the result is "key not found".
+    */
+    if ((search_flag == HA_READ_KEY_EXACT) &&
+        (info->lastpos >= info->state->data_file_length))
+    {
+      my_errno= HA_ERR_KEY_NOT_FOUND;
+      info->lastpos= HA_OFFSET_ERROR;
+    }
+    else while (info->lastpos >= info->state->data_file_length)
     {
       /*
 	Skip rows that are inserted by other threads since we got a lock
 	Note that this can only happen if we are not searching after an
 	exact key, because the keys are sorted according to position
       */
-
       if  (_mi_search_next(info, keyinfo, info->lastkey,
 			   info->lastkey_length,
 			   myisam_readnext_vec[search_flag],
@@ -92,6 +103,7 @@ int mi_rkey(MI_INFO *info, byte *buf, int inx, const byte *key, uint key_len,
 	break;
     }
   }
+
   if (share->concurrent_insert)
     rw_unlock(&share->key_root_lock[inx]);
 
diff --git a/sql/sql_class.cc b/sql/sql_class.cc
index 66d23ada163..f8cf8a7a58e 100644
--- a/sql/sql_class.cc
+++ b/sql/sql_class.cc
@@ -477,7 +477,7 @@ bool select_send::send_data(List<Item> &items)
 {
   List_iterator_fast<Item> li(items);
   String *packet= &thd->packet;
-  DBUG_ENTER("send_data");
+  DBUG_ENTER("select_send::send_data");
 
 #ifdef HAVE_INNOBASE_DB
   /* We may be passing the control from mysqld to the client: release the
@@ -611,7 +611,7 @@ select_export::prepare(List<Item> &list)
 bool select_export::send_data(List<Item> &items)
 {
 
-  DBUG_ENTER("send_data");
+  DBUG_ENTER("select_export::send_data");
   char buff[MAX_FIELD_WIDTH],null_buff[2],space[MAX_FIELD_WIDTH];
   bool space_inited=0;
   String tmp(buff,sizeof(buff)),*res;
@@ -828,7 +828,7 @@ bool select_dump::send_data(List<Item> &items)
   String tmp(buff,sizeof(buff)),*res;
   tmp.length(0);
   Item *item;
-  DBUG_ENTER("send_data");
+  DBUG_ENTER("select_dump::send_data");
 
   if (thd->offset_limit)
   {						// using limit offset,count