diff --git a/mysql-test/r/temp_table.result b/mysql-test/r/temp_table.result
index 0b6bc48c350..80d4e8cc06d 100644
--- a/mysql-test/r/temp_table.result
+++ b/mysql-test/r/temp_table.result
@@ -108,3 +108,20 @@ d	c
 bar	2
 foo	1
 drop table t1, t2;
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (i INT);
+LOCK TABLE t1 WRITE;
+CREATE TEMPORARY TABLE t1 (i INT);
+The following command should not block
+DROP TEMPORARY TABLE t1;
+DROP TABLE t1;
+CREATE TABLE t1 (i INT);
+CREATE TEMPORARY TABLE t2 (i INT);
+DROP TEMPORARY TABLE t2, t1;
+ERROR 42S02: Unknown table 't1'
+SELECT * FROM t2;
+ERROR 42S02: Table 'test.t2' doesn't exist
+SELECT * FROM t1;
+i
+DROP TABLE t1;
+End of 4.1 tests.
diff --git a/mysql-test/t/temp_table.test b/mysql-test/t/temp_table.test
index 309855d0b2d..69082840988 100644
--- a/mysql-test/t/temp_table.test
+++ b/mysql-test/t/temp_table.test
@@ -99,4 +99,50 @@ insert into t2 values (NULL, 'foo'), (NULL, 'bar');
 select d, c from t1 left join t2 on b = c where a = 3 order by d;
 drop table t1, t2;
 
-# End of 4.1 tests
+
+#
+# BUG#21096: locking issue ; temporary table conflicts.
+#
+# The problem was that on DROP TEMPORARY table name lock was acquired,
+# which should not be done.
+#
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+
+CREATE TABLE t1 (i INT);
+
+LOCK TABLE t1 WRITE;
+
+connect (conn1, localhost, root,,);
+
+CREATE TEMPORARY TABLE t1 (i INT);
+
+--echo The following command should not block
+DROP TEMPORARY TABLE t1;
+
+disconnect conn1;
+connection default;
+
+DROP TABLE t1;
+
+#
+# Check that it's not possible to drop a base table with
+# DROP TEMPORARY statement.
+#
+CREATE TABLE t1 (i INT);
+CREATE TEMPORARY TABLE t2 (i INT);
+
+--error 1051
+DROP TEMPORARY TABLE t2, t1;
+
+# Table t2 should have been dropped.
+--error 1146
+SELECT * FROM t2;
+# But table t1 should still be there.
+SELECT * FROM t1;
+
+DROP TABLE t1;
+
+
+--echo End of 4.1 tests.
diff --git a/sql/sql_table.cc b/sql/sql_table.cc
index a5cb0d45664..da66b556b5e 100644
--- a/sql/sql_table.cc
+++ b/sql/sql_table.cc
@@ -214,7 +214,7 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
   bool some_tables_deleted=0, tmp_table_deleted=0, foreign_key_error=0;
   DBUG_ENTER("mysql_rm_table_part2");
 
-  if (lock_table_names(thd, tables))
+  if (!drop_temporary && lock_table_names(thd, tables))
     DBUG_RETURN(1);
 
   for (table=tables ; table ; table=table->next)
@@ -311,7 +311,8 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
     }
   }
 
-  unlock_table_names(thd, tables);
+  if (!drop_temporary)
+    unlock_table_names(thd, tables);
   DBUG_RETURN(error);
 }