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In a diablo/kvm cluster that has been running for a long time, a user 
reported problems with some vms, tried rebooting them and eventually 
deleted them. I recently noticed messages in the nova compute log like: 
Found 13 in the database and 10 on the hypervisor.

Looking at the source code I understand that this means the instances 
have been deleted as far as the hypervisor is concerned, but nova still 
thinks they are there.
I found the offending instances in the database and they were still 
listed as in the active state even though they
had a deletion date recorded. I tried to delete them but was unable due 
to a foreign key error with virtual_interfaces. I could play around with 
deleting various things from the database but there are real users. Is 
their a documented way to "clean up" the state of the nova database in 
such situations? It seems like a bug that the database could get into 
this state.

Also, it seems that deleted instances are never removed from the 
database. Is that a bug?

  -David