It looks like thread 5 runs amok in sql_dbconn_mutex() while locking
sql_dbconn_mutex. That mutex lacks an unlock operation in 2.3.38 where
slapd logs "backsql_open_db_conn(...): duplicate connection ID". (Which
doesn't sound too good to me either, but then I don't know back-sql.)
If that's the problem, it was fixed in OpenLDAP 2.3.39 for ITS#5095.
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