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[Bug 1261442] [NEW] Spurious error from ComputeManager._run_image_cache_manager_pass

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Public bug reported:

I got the following errors in a tempest test at
http://logs.openstack.org/97/62397/1/check/check-tempest-dsvm-
full/3f7b8c3:


2013-12-16 16:07:52.189 27621 DEBUG nova.openstack.common.processutils [-] Result was 1 execute /opt/stack/new/nova/nova/openstack/common/processutils.py:172
2013-12-16 16:07:52.189 27621 ERROR nova.openstack.common.periodic_task [-] Error during ComputeManager._run_image_cache_manager_pass: Unexpected error while running command.
Command: env LC_ALL=C LANG=C qemu-img info /opt/stack/data/nova/instances/95dbf14f-3abb-42c7-94c5-dd7355ecd78a/disk
Exit code: 1
Stdout: ''
Stderr: "qemu-img: Could not open '/opt/stack/data/nova/instances/95dbf14f-3abb-42c7-94c5-dd7355ecd78a/disk': No such file or directory\n"
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task Traceback (most recent call last):
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/openstack/common/periodic_task.py", line 180, in run_periodic_tasks
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     task(self, context)
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/compute/manager.py", line 5210, in _run_image_cache_manager_pass
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     self.driver.manage_image_cache(context, filtered_instances)
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 4650, in manage_image_cache
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     self.image_cache_manager.verify_base_images(context, all_instances)
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/virt/libvirt/imagecache.py", line 603, in verify_base_images
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     inuse_backing_images = self._list_backing_images()
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/virt/libvirt/imagecache.py", line 345, in _list_backing_images
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     backing_file = virtutils.get_disk_backing_file(disk_path)
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/virt/libvirt/utils.py", line 442, in get_disk_backing_file
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     backing_file = images.qemu_img_info(path).backing_file
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/virt/images.py", line 56, in qemu_img_info
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     'qemu-img', 'info', path)
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/utils.py", line 175, in execute
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     return processutils.execute(*cmd, **kwargs)
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/openstack/common/processutils.py", line 178, in execute
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     cmd=' '.join(cmd))
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task ProcessExecutionError: Unexpected error while running command.
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task Command: env LC_ALL=C LANG=C qemu-img info /opt/stack/data/nova/instances/95dbf14f-3abb-42c7-94c5-dd7355ecd78a/disk
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task Exit code: 1
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task Stdout: ''
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task Stderr: "qemu-img: Could not open '/opt/stack/data/nova/instances/95dbf14f-3abb-42c7-94c5-dd7355ecd78a/disk': No such file or directory\n"
2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1261442

Title:
  Spurious error from ComputeManager._run_image_cache_manager_pass

Status in OpenStack Compute (Nova):
  New

Bug description:
  I got the following errors in a tempest test at
  http://logs.openstack.org/97/62397/1/check/check-tempest-dsvm-
  full/3f7b8c3:


  2013-12-16 16:07:52.189 27621 DEBUG nova.openstack.common.processutils [-] Result was 1 execute /opt/stack/new/nova/nova/openstack/common/processutils.py:172
  2013-12-16 16:07:52.189 27621 ERROR nova.openstack.common.periodic_task [-] Error during ComputeManager._run_image_cache_manager_pass: Unexpected error while running command.
  Command: env LC_ALL=C LANG=C qemu-img info /opt/stack/data/nova/instances/95dbf14f-3abb-42c7-94c5-dd7355ecd78a/disk
  Exit code: 1
  Stdout: ''
  Stderr: "qemu-img: Could not open '/opt/stack/data/nova/instances/95dbf14f-3abb-42c7-94c5-dd7355ecd78a/disk': No such file or directory\n"
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task Traceback (most recent call last):
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/openstack/common/periodic_task.py", line 180, in run_periodic_tasks
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     task(self, context)
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/compute/manager.py", line 5210, in _run_image_cache_manager_pass
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     self.driver.manage_image_cache(context, filtered_instances)
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/virt/libvirt/driver.py", line 4650, in manage_image_cache
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     self.image_cache_manager.verify_base_images(context, all_instances)
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/virt/libvirt/imagecache.py", line 603, in verify_base_images
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     inuse_backing_images = self._list_backing_images()
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/virt/libvirt/imagecache.py", line 345, in _list_backing_images
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     backing_file = virtutils.get_disk_backing_file(disk_path)
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/virt/libvirt/utils.py", line 442, in get_disk_backing_file
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     backing_file = images.qemu_img_info(path).backing_file
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/virt/images.py", line 56, in qemu_img_info
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     'qemu-img', 'info', path)
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/utils.py", line 175, in execute
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     return processutils.execute(*cmd, **kwargs)
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task   File "/opt/stack/new/nova/nova/openstack/common/processutils.py", line 178, in execute
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task     cmd=' '.join(cmd))
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task ProcessExecutionError: Unexpected error while running command.
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task Command: env LC_ALL=C LANG=C qemu-img info /opt/stack/data/nova/instances/95dbf14f-3abb-42c7-94c5-dd7355ecd78a/disk
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task Exit code: 1
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task Stdout: ''
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task Stderr: "qemu-img: Could not open '/opt/stack/data/nova/instances/95dbf14f-3abb-42c7-94c5-dd7355ecd78a/disk': No such file or directory\n"
  2013-12-16 16:07:52.189 27621 TRACE nova.openstack.common.periodic_task

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