Open Stack

Hey Stackers,

We've noticed while administering the TryStack site that VMs tend to get 
into a stuck 'building' VM state, but we haven't been able to track down 
exactly what might be causing the problems. Hoping I can get some 
insight from folks running Diablo-based clouds.

Here is what the Nova database has recorded for VMs in the building or 
error VM states:

mysql> select vm_state, task_state, count(*) from instances where 
vm_state in ('building', 'error') group by vm_state, task_state order by 
count(*) desc;
+----------+------------+----------+
| vm_state | task_state | count(*) |
+----------+------------+----------+
| building | deleting   |      128 |
| building | networking |       40 |
| building | scheduling |       26 |
| error    | spawning   |       10 |
| building | spawning   |        1 |
+----------+------------+----------+
5 rows in set (0.01 sec)


As you can see, the majority of stuck VMs are in a "building" vm_state 
but with a "deleting" task_state.

Could someone elaborate how something is in a "deleting" task state 
during a build process?

Thanks in advance for any hints!
-jay