### Description

I am using Kamailio with Mariadb module And i am get in Kamailio log some error messages: ``` "ERROR: db_mysql [km_dbase.c:122]: db_mysql_submit_query(): driver error on query: Table 'active_watchers' was not locked with LOCK TABLES (1100)" "ERROR: db_mysql [km_dbase.c:122]: db_mysql_submit_query(): driver error on query: Table 'active_watchers' was not locked with LOCK TABLES (1100)" "ERROR: db_mysql [km_dbase.c:122]: db_mysql_submit_query(): driver error on query: Table 'active_watchers' was not locked with LOCK TABLES (1100)" ``` After start debug log queries in Mariadb, i see queries in logfile like this: ``` 1141 Query SET autocommit=0 1141 Query LOCK TABLES presentity WRITE 1141 Query update `presentity` set `etag`='a.1620236063.17716.2514.101',`expires`=1625215189,`received_time`=1625214589,`priority`=205144189,`body`='<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<presence xmlns:dm="urn:ietf:params:xml:ns:pidf:data-model" xmlns:rpid="urn:ietf:params:xml:ns:pidf:rpid" xmlns:pidfonline="http://www.linphone.org/xsds/pidfonline.xsd%5C" entity="sip:name_user@office-dev.com" xmlns="urn:ietf:params:xml:ns:pidf">\n <tuple id="bephbl">\n <status>\n <basic>open</basic>\n pidfonline:online/\n </status>\n <contact priority="0.8">sip:name_user@office-dev.com</contact>\n <timestamp>2021-07-01T17:20:41Z</timestamp>\n </tuple>\n</presence>\n' where `domain`='office-dev.com' AND `username`='name_user' AND `event`='presence' AND `etag`='a.1620236063.17716.2513.100' 1141 Query select `to_user`,`to_domain`,`from_user`,`from_domain`,`watcher_username`,`watcher_domain`,`event_id`,`from_tag`,`to_tag`,`callid`,`local_cseq`,`record_route`,`contact`,`expires`,`reason`,`socket_info`,`local_contact`,`version`,`flags`,`user_agent` from `active_watchers` where `presentity_uri`='sip:name_user@office-dev.com' AND `event`='presence' AND `status`=1 AND `contact`<>'' 1141 Query COMMIT 1141 Query SET autocommit=1 1141 Query UNLOCK TABLES ``` or this one ``` 1141 Query LOCK TABLES presentity WRITE 1141 Query insert into `presentity` (`domain`,`username`,`event`,`etag`,`sender`,`body`,`received_time`,`priority`,`expires` ) values ('dev.com','+121342','presence','a.1620236063.17716.2532.0','','<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<presence xmlns:dm="urn:ietf:params:xml:ns:pidf:data-model" xmlns:rpid="urn:ietf:params:xml:ns:pidf:rpid" xmlns:pidfonline="http://www.linphone.org/xsds/pidfonline.xsd%5C" entity="sip:+121342@dev.com" xmlns="urn:ietf:params:xml:ns:pidf">\n <tuple id="wumhh7">\n <status>\n <basic>open</basic>\n pidfonline:online/\n </status>\n <contact priority="0.8">sip:+121342@dev.com</contact>\n <timestamp>2021-07-02T10:55:26Z</timestamp>\n </tuple>\n</presence>\n',1625223329,205152929,1625226929) 1141 Query select `to_user`,`to_domain`,`from_user`,`from_domain`,`watcher_username`,`watcher_domain`,`event_id`,`from_tag`,`to_tag`,`callid`,`local_cseq`,`record_route`,`contact`,`expires`,`reason`,`socket_info`,`local_contact`,`version`,`flags`,`user_agent` from `active_watchers` where `presentity_uri`='sip:+121342@dev.com' AND `event`='presence' AND `status`=1 AND `contact`<>'' 1141 Query COMMIT 1141 Query SET autocommit=1 1141 Query UNLOCK TABLES ```

This queries matches for time with reproduced errors in above kamailio log.

#### Reproduction In test lab ``` MariaDB [kamailio]> LOCK TABLES presentity WRITE; Query OK, 0 rows affected (0.00 sec)

MariaDB [kamailio]> select * from presentity; Empty set (0.00 sec)

MariaDB [kamailio]> select * from active_watcher; ERROR 1100 (HY000): Table 'active_watcher' was not locked with LOCK TABLES MariaDB [kamailio]> ``` I get same error

Also i am found in additional documentation from Mysql next: ``` A session that requires locks must acquire all the locks that it needs in a single LOCK TABLES statement. While the locks thus obtained are held, the session can access only the locked tables. ``` or from Mariadb docs

``` While a connection holds an explicit lock on a table, it cannot access a non-locked table. If you try, the following error will be produced:

ERROR 1100 (HY000): Table 'tab_name' was not locked with LOCK TABLES

``` ### Additional Information

* **Kamailio Version** *

``` Kamailio ver 5.4.5 or 5.6.0 ```

So, maybe need add additional lock for table active_watchers or need take out query select from space LOCK - UNLOCK for resolve this issue?