row0mysql.c, row0mysql.h, ha_innodb.cc, sql_table.cc, handler.h:

  Fix crash when InnoDB temp table is truncated + fix bug: do not X-lock rows under LOCK TABLES except if the table is temp


sql/handler.h:
  Fix crash when InnoDB temp table is truncated + fix bug: do not X-lock rows under LOCK TABLES except if the table is temp
sql/sql_table.cc:
  Fix crash when InnoDB temp table is truncated + fix bug: do not X-lock rows under LOCK TABLES except if the table is temp
sql/ha_innodb.cc:
  Fix crash when InnoDB temp table is truncated + fix bug: do not X-lock rows under LOCK TABLES except if the table is temp
innobase/include/row0mysql.h:
  Fix crash when InnoDB temp table is truncated + fix bug: do not X-lock rows under LOCK TABLES except if the table is temp
innobase/row/row0mysql.c:
  Fix crash when InnoDB temp table is truncated + fix bug: do not X-lock rows under LOCK TABLES except if the table is temp

innobase/include/row0mysql.h

@@ -408,6 +408,10 @@ struct row_prebuilt_struct {
 					an SQL statement: we may have to set
 					an intention lock on the table,
 					create a consistent read view etc. */
+        ibool           mysql_has_locked; /* this is set TRUE when MySQL
+			                calls external_lock on this handle
+			                with a lock flag, and set FALSE when
+			                with the F_UNLOCK flag */
 	ibool		clust_index_was_generated;
 					/* if the user did not define a
 					primary key in MySQL, then Innobase

innobase/row/row0mysql.c

@@ -320,6 +320,8 @@ row_create_prebuilt(
 
 	prebuilt->sql_stat_start = TRUE;
 
+	prebuilt->mysql_has_locked = FALSE;
+
 	prebuilt->index = NULL;
 	prebuilt->n_template = 0;
 	prebuilt->mysql_template = NULL;

sql/ha_innodb.cc

@@ -3077,19 +3077,22 @@ ha_innobase::create(
       		}
   	}
 
-	error = row_table_add_foreign_constraints(trx,
-				create_info->create_statement, norm_name);
+	if (current_thd->query != NULL) {
+  	
+		error = row_table_add_foreign_constraints(trx,
+					current_thd->query, norm_name);
 
-	error = convert_error_code_to_mysql(error, NULL);
+		error = convert_error_code_to_mysql(error, NULL);
 
-	if (error) {
-		innobase_commit_low(trx);
+		if (error) {
+			innobase_commit_low(trx);
 
-		row_mysql_unlock_data_dictionary(trx);
+			row_mysql_unlock_data_dictionary(trx);
 
-  		trx_free_for_mysql(trx);
+  			trx_free_for_mysql(trx);
 
-		DBUG_RETURN(error);
+			DBUG_RETURN(error);
+		}
 	}
 
   	innobase_commit_low(trx);
@@ -3751,7 +3754,7 @@ ha_innobase::start_stmt(
 	prebuilt->hint_no_need_to_fetch_extra_cols = TRUE;
 	prebuilt->read_just_key = 0;
 
-	if (prebuilt->select_lock_type == LOCK_NONE) {
+	if (!prebuilt->mysql_has_locked) {
 	        /* This handle is for a temporary table created inside
 	        this same LOCK TABLES; since MySQL does NOT call external_lock
 	        in this case, we must use x-row locks inside InnoDB to be
@@ -3829,6 +3832,7 @@ ha_innobase::external_lock(
 
 		thd->transaction.all.innodb_active_trans = 1;
 		trx->n_mysql_tables_in_use++;
+		prebuilt->mysql_has_locked = TRUE;
 
 		if (thd->variables.tx_isolation != ISO_REPEATABLE_READ) {
 			trx->isolation_level = innobase_map_isolation_level(
@@ -3852,6 +3856,7 @@ ha_innobase::external_lock(
 		}
 	} else {
 		trx->n_mysql_tables_in_use--;
+		prebuilt->mysql_has_locked = FALSE;
 		auto_inc_counter_for_this_stat = 0;
 
 		if (trx->n_mysql_tables_in_use == 0) {

sql/handler.h

@@ -157,7 +157,6 @@ typedef struct st_ha_create_information
   ulonglong auto_increment_value;
   char *comment,*password;
   char *data_file_name, *index_file_name;
-  char *create_statement;
   uint options;					/* OR of HA_CREATE_ options */
   uint raid_type,raid_chunks;
   ulong raid_chunksize;

sql/sql_table.cc

@@ -695,7 +695,6 @@ int mysql_create_table(THD *thd,const char *db, const char *table_name,
 
   thd->proc_info="creating table";
 
-  create_info->create_statement = thd->query;
   create_info->table_options=db_options;
   if (rea_create_table(path, create_info, fields, key_count,
 		       key_info_buffer))