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[OpenStack Infra <1686703@xxxxxxxxxxxxxxxxxx>]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/nova/+/877410

** Changed in: nova
       Status: Won't Fix => In Progress

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https://bugs.launchpad.net/bugs/1686703

Title:
  Error in finish_migration results in image deletion on source with no
  copy

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  ML post describing the issue here:

    http://lists.openstack.org/pipermail/openstack-
  dev/2017-April/115989.html

  User was resizing an instance whose glance image had been deleted. An
  ssh failure occurred in finish_migration, which runs on the
  destination, attempting to copy the image out of the image cache on
  the source. This left the instance and migration in an error state on
  the destination, but with no copy of the image on the destination.
  Cache manager later ran on the source and expired the image from the
  image cache there, leaving no remaining copies. At this point the
  user's instance was unrecoverable.

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