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[Launchpad Bug Tracker <1323403@xxxxxxxxxxxxxxxxxx>]

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If volume backed snapshot is available for an user euca-describe-images
crashes due to 'unknown server error'.

Environment: DevStack

Steps to reproduce:

1 Create a volume backed snapshot
$ cinder create --image-id xxx 1
$ nova boot --flavor m1.nano --image xxx --block-device-mapping /dev/vda=yyy:::1 inst

2 List images to ensure the created snapshot is available.
$ glance image-list

3 Describe images by euca2ools
$ euca-describe-images
TypeError: Unknown error occurred.

nova-api.log
2014-05-26 23:16:18.070 ERROR nova.api.ec2 [req-105138c5-1b82-42ff-a5fd-4588a4262763 demo demo] Unexpected TypeError raised: int() argument must be a string or a number, 
not 'NoneType'
2014-05-26 23:16:18.071 DEBUG nova.api.ec2.faults [req-105138c5-1b82-42ff-a5fd-4588a4262763 demo demo] EC2 error response: TypeError: Unknown error occurred. ec2_error_response /opt/stack/nova/nova/api/ec2/faults.py:29

** Affects: nova
     Importance: Undecided
     Assignee: Feodor Tersin (ftersin)
         Status: New

-- 
ec2-api crashes on describing volume backed snapshot
https://bugs.launchpad.net/bugs/1323403
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