TiDB panics when using both the plugins 'Audit Log' and 'Extends Audit Log' simultaneously

[aytrack]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

1. deploy a enterprise tidb cluster with audit log plugin
2. enable audit log plugin and extends audit log

select audit_log_create_filter('all', '{}');
select audit_log_create_rule('%@%', 'all');
set global tidb_audit_enabled = 1;

insert into mysql.tidb_audit_table_access (user, db, tbl, access_type) values ('test', '.*', '.*', ''), ('^qa$', '.*', '.*', '');
flush tidb plugins audit;
create user test;

3. connet the tidb cluster with user test and execute sql

use test

2. What did you expect to see? (Required)

both old and new audit log should record correctlly.

3. What did you see instead (Required)

tidb panic. If grant the privileges to the user, it will works.

mysql> use test;
ERROR 1105 (HY000): runtime error: invalid memory address or nil pointer dereference

tidb log

[2023/05/17 09:33:13.475 +00:00] [ERROR] [conn.go:1057] ["connection running loop panic"] [conn=4494121837139070629] [lastSQL="Use test"] [err="runtime error: invalid memory address or nil pointer dereference"] [stack="github.com/pingcap/tidb/server.(*clientConn).Run.func1
	/home/jenkins/agent/workspace/build-tidb-release-7.1/tidb/server/conn.go:1060
runtime.gopanic
	/usr/local/go/src/runtime/panic.go:884
runtime.panicmem
	/usr/local/go/src/runtime/panic.go:260
runtime.sigpanic
	/usr/local/go/src/runtime/signal_unix.go:837
github.com/pingcap/tidb/server.(*stmtEventInfo).ensureStmtContextOriginalSQL
	/home/jenkins/agent/workspace/build-tidb-release-7.1/tidb/server/extension.go:239
github.com/pingcap/tidb/server.(*stmtEventInfo).SQLDigest
	/home/jenkins/agent/workspace/build-tidb-release-7.1/tidb/server/extension.go:170
github.com/pingcap/tidb/extension/enterprise/audit.newStmtEventEntry.func1
	/home/jenkins/agent/workspace/build-tidb-release-7.1/tidb/extension/enterprise/audit/entry.go:388
github.com/pingcap/tidb/extension/enterprise/audit.(*LogEntry).Log
	/home/jenkins/agent/workspace/build-tidb-release-7.1/tidb/extension/enterprise/audit/entry.go:470
github.com/pingcap/tidb/extension/enterprise/audit.(*LogManager).GetSessionHandler.func2
	/home/jenkins/agent/workspace/build-tidb-release-7.1/tidb/extension/enterprise/audit/manager.go:659
github.com/pingcap/tidb/extension.(*SessionExtensions).OnStmtEvent
	/home/jenkins/agent/workspace/build-tidb-release-7.1/tidb/extension/session.go:145
github.com/pingcap/tidb/server.(*clientConn).onExtensionStmtEnd
	/home/jenkins/agent/workspace/build-tidb-release-7.1/tidb/server/extension.go:99
github.com/pingcap/tidb/server.(*clientConn).dispatch
	/home/jenkins/agent/workspace/build-tidb-release-7.1/tidb/server/conn.go:1343
github.com/pingcap/tidb/server.(*clientConn).Run
	/home/jenkins/agent/workspace/build-tidb-release-7.1/tidb/server/conn.go:1138
github.com/pingcap/tidb/server.(*Server).onConn
	/home/jenkins/agent/workspace/build-tidb-release-7.1/tidb/server/server.go:677"]
[2023/05/17 09:36:25.598 +00:00] [INFO] [domain.go:2634] ["refreshServerIDTTL succeed"] [serverID=2043690] ["lease id"=54ca882879068c09]

4. What is your TiDB version? (Required)

+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| tidb_version()                                                                                                                                                                                                                                                                                |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Release Version: v7.1.0
Edition: Enterprise
Git Commit Hash: 6d29491cec48777cf80f3fa24cf70b3ae9d1cd87
Git Branch: heads/refs/tags/v7.1.0
UTC Build Time: 2023-05-16 13:11:57
GoVersion: go1.20.3
Race Enabled: false
TiKV Min Version: 6.2.0-alpha
Check Table Before Drop: false
Store: tikv |
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

[lcwangchao]

This bug is introduced by #42651