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How to interpret nova instance vm_state = "error"

I see many such entries in the nova.instances sql table:

id : 3185 vm_state : error created_at : 2015-06-24 11:35:55 updated_at : 2015-07-16 09:11:54 launched_at : 2015-06-24 11:36:31 terminated_at : 2015-07-07 12:33:52 deleted_at : 2015-07-07 12:33:54 host : kvmc13.hpiscmgmt.local

My interpretation of what has happened when vm_state = "error" 1. launched_at field is null: error occurred while attempting to launch 2. launch_at is populated, but terminated_at is null: error occurred while attempting to terminate, although VM instance had been created and launched successfully. 3. terminated_at is populated, but deleted_at is null: error occurred while attempting to delete, although VM instance had been created and launched successfully. 4. launced_at, terminated_at, deleted_at all have valid timestamp entries: What does this mean? VM instance had been launched and deleted successfully? If so, what could have cause the "error" in vm_state?

Is my reasoning for 1 - 3 correct? And how do I interpret 4?

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How to interpret nova instance vm_state = "error"

I see many such entries in the nova.instances sql table:

id : 3185 3185
vm_state : error error
created_at : 2015-06-24 11:35:55 11:35:55
updated_at : 2015-07-16 09:11:54 09:11:54
launched_at : 2015-06-24 11:36:31 11:36:31
terminated_at : 2015-07-07 12:33:52 12:33:52
deleted_at : 2015-07-07 12:33:54 12:33:54
host : kvmc13.hpiscmgmt.local

My interpretation of what has happened when vm_state = "error" "error"
1. launched_at field is null: error occurred while attempting to launch launch
2. launch_at is populated, but terminated_at is null: error occurred while attempting to terminate, although VM instance had been created and launched successfully. successfully.
3. terminated_at is populated, but deleted_at is null: error occurred while attempting to delete, although VM instance had been created and launched successfully. successfully.
4. launced_at, terminated_at, deleted_at all have valid timestamp entries: What does this mean? VM instance had been launched and deleted successfully? If so, what could have cause the "error" in vm_state?

Is my reasoning for 1 - 3 correct? And how do I interpret 4?