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Error message
PDOException: SQLSTATE[40001]: Serialization failure: 1213 Deadlock found when trying to get lock; try restarting transaction: DELETE FROM {semaphore}
WHERE (name = :db_condition_placeholder_0) AND (value = :db_condition_placeholder_1) AND (expire <= :db_condition_placeholder_2) ; Array
(
[:db_condition_placeholder_0] => variable_init
[:db_condition_placeholder_1] => 10320948755c3f22a8cc2189.34605250
[:db_condition_placeholder_2] => 1547641513.8633
)
in lock_may_be_available() (line 181 of /var/www/prod/docroot/includes/lock.inc).