** Changed in: nova/kilo
   Importance: Undecided => High

** Changed in: nova
       Status: Incomplete => Fix Released

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https://bugs.launchpad.net/bugs/1457527

Title:
  Image-cache deleting active swap backing images

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) kilo series:
  Fix Released

Bug description:
  Version: 1:2015.1.0-0ubuntu1~cloud0 (Kilo)

  I am having issues with backing images of disk.swap being deleted from
  the image cache.

  Here is part of the nova-compute log, although multiple instances have
  disk.swap with swap_256 as the base image, the image cache repeatedly
  tries to delete it:

  2015-05-14 08:08:15.080 4319 INFO nova.virt.libvirt.imagecache 
[req-967c82af-329e-42ff-aade-f4af2b4ba732 - - - - -] Base or swap file too 
young to remove: /var/lib/nova/instances/_base/swap_256
  2015-05-14 08:48:46.209 4319 INFO nova.virt.libvirt.imagecache 
[req-967c82af-329e-42ff-aade-f4af2b4ba732 - - - - -] Base or swap file too 
young to remove: /var/lib/nova/instances/_base/swap_256
  2015-05-14 09:29:00.814 4319 INFO nova.virt.libvirt.imagecache 
[req-967c82af-329e-42ff-aade-f4af2b4ba732 - - - - -] Base or swap file too 
young to remove: /var/lib/nova/instances/_base/swap_256
  2015-05-14 10:09:14.351 4319 INFO nova.virt.libvirt.imagecache 
[req-967c82af-329e-42ff-aade-f4af2b4ba732 - - - - -] Removing base or swap 
file: /var/lib/nova/instances/_base/swap_256
  2015-05-14 16:14:21.340 6479 INFO nova.virt.libvirt.imagecache 
[req-1d61428f-0b8b-4bae-9293-42ac99dc3f58 - - - - -] Base or swap file too 
young to remove: /var/lib/nova/instances/_base/swap_256
  2015-05-14 16:55:21.195 6479 INFO nova.virt.libvirt.imagecache 
[req-1d61428f-0b8b-4bae-9293-42ac99dc3f58 - - - - -] Base or swap file too 
young to remove: /var/lib/nova/instances/_base/swap_256
  2015-05-14 17:36:12.260 6479 INFO nova.virt.libvirt.imagecache 
[req-1d61428f-0b8b-4bae-9293-42ac99dc3f58 - - - - -] Base or swap file too 
young to remove: /var/lib/nova/instances/_base/swap_256

  I am NOT using shared storage for the instances directory, it is
  sitting on the local filesystem, and instances on the same host node
  are using the swap base file that the image cache is deleting.

  As far as I can tell, it is attempting to delete it immediately after
  the swap image is created. Swap backing images of the form
  swap_512_512 are not deleted though (as opposed to just swap_512; I
  couldn't figure out what the difference is).

  Reproduce: Create volume with swap disk
  Temporary solution: image_cache_manager_interval = -1

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