on our site with Moodle 3.5.1+ (Build: 20180831), for the last couple of days, our cron job periodically gave me this error:
Exception ignored in shutdown function array (
0 =>
core\lock\postgres_lock_factory::__set_state(array(
'dblockid' => -627482549,
'db' =>
pgsql_native_moodle_database::__set_state(array(
'pgsql' => NULL,
'last_error_reporting' => 0,
'savepointpresent' => false,
'cursorcount' => 1,
'database_manager' => NULL,
'temptables' =>
pgsql_native_moodle_temptables::__set_state(array(
'mdb' => NULL,
'prefix' => 'mdl_',
'temptables' =>
array (
),
)),
'tables' => NULL,
'dbhost' => '[deleted]',
'dbuser' => '[deleted]',
'dbpass' => '[deleted]',
'dbname' => '[deleted]',
'prefix' => 'mdl_',
'dboptions' =>
array (
'dbpersist' => 0,
'dbsocket' => '',
'dbport' => 5433,
),
'external' => false,
'reads' => 44,
'writes' => 0,
'queriestime' => 8009.0717916488647,
'debug' => 0,
'last_sql' => 'SELECT pg_advisory_unlock($1, $2) AS unlocked',
'last_params' =>
array (
0 => -627482549,
1 => 17106,
),
'last_type' => 1,
'last_extrainfo' => NULL,
'last_time' => 1537967611.248033,
'loggingquery' => false,
'used_for_db_sessions' => false,
'transactions' =>
array (
),
'force_rollback' => false,
'settingshash' => NULL,
'metacache' => NULL,
'metacachetemp' => NULL,
'disposed' => NULL,
'fix_sql_params_i' => 2,
'inorequaluniqueindex' => 1,
'skiplogging' => false,
)),
'type' => 'cron',
'openlocks' =>
array (
17106 => 1,
),
)),
1 => 'auto_release',
):error reading database
the site seems normal and responsive though, our DB admin also reported no problems.