I am regularly getting these errors in the log. According to some posts here the lock conversion is a very rare error and it happens when read transaction gets promoted to write transaction. I want to know what does it mean and why is it happening on the security database. There is nothing that should be modifying that database. And why is it happening on the page type 3, which is a transaction information page. If the security database corrupt? I tried running gfix on it but I get "no permission for direct access to security database". What should I do?

data-01 Mon Dec 7 19:00:23 2009
deadlock


data-01 Mon Dec 7 19:00:23 2009
page 776, page type 3 lock conversion denied


data-01 Mon Dec 7 19:00:23 2009
Database: /var/lib/firebird/system/security2.fdb
page 776, page type 3 lock conversion denied (215)