When you have a change tracking enabled database in SQL Server, you may encounter a situation where you may see continuous error 22123 for the same tablename recorded in the error log that resemble the following:
Error: 22123, Severity: 16, State: 1.
Change Tracking autocleanup is blocked on side table of "tablename". If the failure persists, check whether the table "tablename is blocked by any process.
A fix for this issue is included in the following updates for SQL Server:
With this fix, you will not see continuous messages any longer. The frequency of the error 22123 messages, if any, will not be more than once every 30 minutes. To completely eliminate these messages, enable trace flag 8293.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.