Followup: BUG#23479595 SEGMENTATION FAULT WHEN SELECT FTS INDEX

          TABLES IN INFORMATION SCHEMA

BUG#23742339 FAILING ASSERTION: SYM_NODE->TABLE != NULL

Problem: When we access fts aux tables in information schema,the
fts aux tables are dropped by DROP DATABASE in another session.

Solution: Block DDL by s-locking dict_operation_lock.

Reviewed-by: Jimmy Yang <[email protected]>
RB: 13264
(cherry picked from commit c45124a0b582d57ac6cf20b786e0c643ec9ce941)

Author: Shaohua Wang

storage/innobase/handler/i_s.cc

@@ -3004,14 +3004,21 @@ i_s_fts_deleted_generic_fill(
 		DBUG_RETURN(0);
 	}
 
+	/* Prevent DDL to drop fts aux tables. */
+	rw_lock_s_lock(&dict_operation_lock);
+
 	user_table = dict_table_open_on_name(
 		fts_internal_tbl_name, FALSE, FALSE, DICT_ERR_IGNORE_NONE);
 
 	if (!user_table) {
+		rw_lock_s_unlock(&dict_operation_lock);
+
 		DBUG_RETURN(0);
 	} else if (!dict_table_has_fts_index(user_table)) {
 		dict_table_close(user_table, FALSE, FALSE);
 
+		rw_lock_s_unlock(&dict_operation_lock);
+
 		DBUG_RETURN(0);
 	}
 
@@ -3044,6 +3051,8 @@ i_s_fts_deleted_generic_fill(
 
 	dict_table_close(user_table, FALSE, FALSE);
 
+	rw_lock_s_unlock(&dict_operation_lock);
+
 	DBUG_RETURN(0);
 }
 
@@ -3869,10 +3878,15 @@ i_s_fts_index_table_fill(
 		DBUG_RETURN(0);
 	}
 
+	/* Prevent DDL to drop fts aux tables. */
+	rw_lock_s_lock(&dict_operation_lock);
+
 	user_table = dict_table_open_on_name(
 		fts_internal_tbl_name, FALSE, FALSE, DICT_ERR_IGNORE_NONE);
 
 	if (!user_table) {
+		rw_lock_s_unlock(&dict_operation_lock);
+
 		DBUG_RETURN(0);
 	}
 
@@ -3885,6 +3899,8 @@ i_s_fts_index_table_fill(
 
 	dict_table_close(user_table, FALSE, FALSE);
 
+	rw_lock_s_unlock(&dict_operation_lock);
+
 	DBUG_RETURN(0);
 }
 
@@ -4024,14 +4040,21 @@ i_s_fts_config_fill(
 
 	fields = table->field;
 
+	/* Prevent DDL to drop fts aux tables. */
+	rw_lock_s_lock(&dict_operation_lock);
+
 	user_table = dict_table_open_on_name(
 		fts_internal_tbl_name, FALSE, FALSE, DICT_ERR_IGNORE_NONE);
 
 	if (!user_table) {
+		rw_lock_s_unlock(&dict_operation_lock);
+
 		DBUG_RETURN(0);
 	} else if (!dict_table_has_fts_index(user_table)) {
 		dict_table_close(user_table, FALSE, FALSE);
 
+		rw_lock_s_unlock(&dict_operation_lock);
+
 		DBUG_RETURN(0);
 	}
 
@@ -4087,6 +4110,8 @@ i_s_fts_config_fill(
 
 	dict_table_close(user_table, FALSE, FALSE);
 
+	rw_lock_s_unlock(&dict_operation_lock);
+
 	DBUG_RETURN(0);
 }