I could reproduce this in a DevStack deployment on Ubuntu 12.04 LTS.

## Glance images folder

vkmc@havana:/opt/stack/data/glance/images$ ls -la
total 33052
drwxrwxr-x 2 vkmc vkmc     4096 Jul  3 12:22 .
drwxrwxr-x 4 vkmc vkmc     4096 Jul  3 12:09 ..
-rw-r----- 1 vkmc vkmc        0 Jul  3 12:22 1aa74a9a-67d0-4005-b78e-0936be8770aa <-
-rw-r----- 1 vkmc vkmc  4955792 Jul  3 12:11 2fb167b6-b0c4-4d78-8667-cefd077433a6
-rw-r----- 1 vkmc vkmc 25165824 Jul  3 12:12 b0b77bb0-36c5-465b-a102-9e282e908b8f
-rw-r----- 1 vkmc vkmc  3714968 Jul  3 12:11 be71ae20-15c5-4dd0-b1d8-44de8afe044d
vkmc@havana:/opt/stack/data/glance/images$ ls -la
total 42000
drwxrwxr-x 2 vkmc vkmc     4096 Jul  3 12:22 .
drwxrwxr-x 4 vkmc vkmc     4096 Jul  3 12:09 ..
-rw-r----- 1 vkmc vkmc  9159168 Jul  3 12:22 1aa74a9a-67d0-4005-b78e-0936be8770aa <-
-rw-r----- 1 vkmc vkmc  4955792 Jul  3 12:11 2fb167b6-b0c4-4d78-8667-cefd077433a6
-rw-r----- 1 vkmc vkmc 25165824 Jul  3 12:12 b0b77bb0-36c5-465b-a102-9e282e908b8f
-rw-r----- 1 vkmc vkmc  3714968 Jul  3 12:11 be71ae20-15c5-4dd0-b1d8-44de8afe044d


## image_locations table after bug reproduction

It's present in the Glance image_locations table

mysql> select * from image_locations;
+----+--------------------------------------+---------------------------------------------------------------------------+---------------------+---------------------+------------+---------+
| id | image_id                             | value                                                                     | created_at          | updated_at          | deleted_at | deleted |
+----+--------------------------------------+---------------------------------------------------------------------------+---------------------+---------------------+------------+---------+
|  1 | 2fb167b6-b0c4-4d78-8667-cefd077433a6 | file:///opt/stack/data/glance/images/2fb167b6-b0c4-4d78-8667-cefd077433a6 | 2013-07-03 15:11:58 | 2013-07-03 15:11:58 | NULL       |       0 |
|  2 | be71ae20-15c5-4dd0-b1d8-44de8afe044d | file:///opt/stack/data/glance/images/be71ae20-15c5-4dd0-b1d8-44de8afe044d | 2013-07-03 15:11:59 | 2013-07-03 15:11:59 | NULL       |       0 |
|  3 | b0b77bb0-36c5-465b-a102-9e282e908b8f | file:///opt/stack/data/glance/images/b0b77bb0-36c5-465b-a102-9e282e908b8f | 2013-07-03 15:12:01 | 2013-07-03 15:12:01 | NULL       |       0 |
|  4 | 1aa74a9a-67d0-4005-b78e-0936be8770aa | file:///opt/stack/data/glance/images/1aa74a9a-67d0-4005-b78e-0936be8770aa | 2013-07-03 15:22:39 | 2013-07-03 15:22:39 | NULL       |       0 |  <-
+----+--------------------------------------+---------------------------------------------------------------------------+---------------------+---------------------+------------+---------+
4 rows in set (0.00 sec)

## image-list after bug reproduction

But, it's not in the image-list

vkmc@havana:/opt/stack/data/glance/images$ glance image-list
+--------------------------------------+---------------------------------+-------------+------------------+----------+--------+
| ID                                   | Name                            | Disk Format | Container Format | Size     | Status |
+--------------------------------------+---------------------------------+-------------+------------------+----------+--------+
| b0b77bb0-36c5-465b-a102-9e282e908b8f | cirros-0.3.1-x86_64-uec         | ami         | ami              | 25165824 | active |
| 2fb167b6-b0c4-4d78-8667-cefd077433a6 | cirros-0.3.1-x86_64-uec-kernel  | aki         | aki              | 4955792  | active |
| be71ae20-15c5-4dd0-b1d8-44de8afe044d | cirros-0.3.1-x86_64-uec-ramdisk | ari         | ari              | 3714968  | active |
+--------------------------------------+---------------------------------+-------------+------------------+----------+--------+