diff -urNad mysql-5.7.18/storage/innobase/page/page0cur.cc mysql-5.7.18.new/storage/innobase/page/page0cur.cc
--- mysql-5.7.18/storage/innobase/page/page0cur.cc	2017-03-18 15:45:14.000000000 +0800
+++ mysql-5.7.18.new/storage/innobase/page/page0cur.cc	2017-06-14 17:41:10.000000000 +0800
@@ -645,8 +645,16 @@
 			goto up_rec_match;
 		}
 	}
-
-	if (mode <= PAGE_CUR_GE) {
+  /* if find the key in the no-leaf node(cmp = 0), do not use 
+   * the pre-node for searching, just use the up_rec, because 
+   * if the row is the first one on a page, use pre-node will
+   * lock the supremum , keys like below:
+   * (infimum, 1,2,...,supremum),(infimum, 5,6,..., supremum),
+   * if do "select * from tbl where id = 5 for update", if use pre-node
+   * for searching, the supremum & id=5, will be locked, but if the 
+   * id = 5 is not the first row of that page, only id=5 will be locked,
+   * different locations maybe resulting difference*/
+	if (mode <= PAGE_CUR_GE || cmp == 0) {
 		page_cur_position(up_rec, block, cursor);
 	} else {
 		page_cur_position(low_rec, block, cursor);