There are bugs and BUGs
From Dmitry Yemanov:
Consider it a bughunting success story 🙂
Some time ago we’ve got a bugreport about bugcheck #205 (index bucket overfilled) appearing during the database restore on a v2.0 server. The database was big and it was hard for the customer to create a test case. Fortunately, a special build with improved tracking facilities helped and the bug has been found and fixed. So far so good.