create_and_list_snapshots.josn failed due to snapshot deleted when status is not available

Snapshot status is deleting after creating 162s , when status is not available,

Times is 100 and concurrency is 32
cinder_volume_create_timeout is 600
cinder_volume_create_prepoll_delay is 2
cinder_volume_create_poll_interval is 2

create_and_list_snapshots.json----94%
+---------------------------------------------------------------------------------------------------------------------------+
| Response Times (sec) |
+------------------------+-----------+--------------+--------------+--------------+-----------+-----------+---------+-------+
| Action | Min (sec) | Median (sec) | 90%ile (sec) | 95%ile (sec) | Max (sec) | Avg (sec) | Success | Count |
+------------------------+-----------+--------------+--------------+--------------+-----------+-----------+---------+-------+
| cinder.create_snapshot | 6.06 | 22.135 | 33.73 | 42.354 | 133.317 | 25.118 | 94.0% | 100 |
| cinder.list_snapshots | 0.031 | 0.124 | 0.242 | 0.277 | 0.389 | 0.133 | 100.0% | 94 |
| total | 6.093 | 22.288 | 33.881 | 42.446 | 133.415 | 25.252 | 94.0% | 100 |
+------------------------+-----------+--------------+--------------+--------------+-----------+-----------+---------+-------+

2016-07-13 15:13:25.294 3366 INFO cinder.volume.manager [req-bd055dc8-aae1-400e-8150-2fc8e1480760 c589c5e7ed664d9fb0911432152fa585 e14fefb660a440d3b5acd4a84f65286b - - -] snapshot 73a7b18b-11c1-456e-bc15-480216f26a08: creating
2016-07-13 15:16:07.414 3366 INFO cinder.volume.manager [req-a9cf5050-b2b1-4d95-81de-e1aea53915b2 c589c5e7ed664d9fb0911432152fa585 e14fefb660a440d3b5acd4a84f65286b - - -] snapshot 73a7b18b-11c1-456e-bc15-480216f26a08: deleting