Github user sureshanaparti commented on the pull request:
https://github.com/apache/cloudstack/pull/830#issuecomment-162483571
@DaanHoogland , @ustcweizhou
This issue is reproduced when the volume associated vm instance has null or
invalid state (vm_state in volume_view). The code changes would guard this
situation since it should not block volume listing.
mysql> SELECT id, name, volume_type, state, vm_state FROM cloud.volume_view
where vm_state is null;
+----+----------------------+-------------+----------+----------+
| id | name | volume_type | state | vm_state |
+----+----------------------+-------------+----------+----------+
| 57 | ROOT-57 | ROOT | Expunged | NULL |
| 69 | mytestvolume | DATADISK | Ready | NULL |
| 71 | DATA-69 | DATADISK | Expunged | NULL |
| 73 | DATA-70 | DATADISK | Expunged | NULL |
| 78 | testvolcreated | DATADISK | Ready | NULL |
| 81 | test2volume | DATADISK | Destroy | NULL |
| 83 | testvol07 | DATADISK | Ready | NULL |
| 87 | testattachvolcreated | DATADISK | Ready | NULL |
+----+----------------------+-------------+----------+----------+
8 rows in set (0.00 sec)
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