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["Davanum Srinivas \(DIMS\)" <davanum@xxxxxxxxx>]

Public bug reported:

See log stash query:
"Device allocation failed. Will retry in 2 seconds."

Example:
http://logs.openstack.org/10/163910/6/check/gate-rally-dsvm-cinder/46d89ab/logs/screen-n-cpu.txt.gz#_2015-03-30_14_55_56_941

Logs:
2015-03-30 14:55:56.940 ERROR nova.virt.disk.mount.nbd [req-df13155c-0340-4e10-aec4-2fabea382eef None None] nbd module not loaded
2015-03-30 14:55:56.940 DEBUG oslo_concurrency.lockutils [req-df13155c-0340-4e10-aec4-2fabea382eef None None] Lock "nbd-allocation-lock" released by "_inner_get_dev" :: held 0.000s inner /usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:456
2015-03-30 14:55:56.941 INFO nova.virt.disk.mount.api [req-df13155c-0340-4e10-aec4-2fabea382eef None None] Device allocation failed. Will retry in 2 seconds.
2015-03-30 14:55:58.941 DEBUG oslo_concurrency.lockutils [req-df13155c-0340-4e10-aec4-2fabea382eef None None] Lock "nbd-allocation-lock" acquired by "_inner_get_dev" :: waited 0.000s inner /usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:444
2015-03-30 14:55:58.941 ERROR nova.virt.disk.mount.nbd [req-df13155c-0340-4e10-aec4-2fabea382eef None None] nbd module not loaded

We should not even enter the loop when /sys/block/nbd0 is clearly
absent.

** Affects: nova
     Importance: Undecided
     Assignee: Davanum Srinivas (DIMS) (dims-v)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1438260

Title:
  Expensive Device allocation loop when NBD is absent

Status in OpenStack Compute (Nova):
  In Progress

Bug description:
  See log stash query:
  "Device allocation failed. Will retry in 2 seconds."

  Example:
  http://logs.openstack.org/10/163910/6/check/gate-rally-dsvm-cinder/46d89ab/logs/screen-n-cpu.txt.gz#_2015-03-30_14_55_56_941

  Logs:
  2015-03-30 14:55:56.940 ERROR nova.virt.disk.mount.nbd [req-df13155c-0340-4e10-aec4-2fabea382eef None None] nbd module not loaded
  2015-03-30 14:55:56.940 DEBUG oslo_concurrency.lockutils [req-df13155c-0340-4e10-aec4-2fabea382eef None None] Lock "nbd-allocation-lock" released by "_inner_get_dev" :: held 0.000s inner /usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:456
  2015-03-30 14:55:56.941 INFO nova.virt.disk.mount.api [req-df13155c-0340-4e10-aec4-2fabea382eef None None] Device allocation failed. Will retry in 2 seconds.
  2015-03-30 14:55:58.941 DEBUG oslo_concurrency.lockutils [req-df13155c-0340-4e10-aec4-2fabea382eef None None] Lock "nbd-allocation-lock" acquired by "_inner_get_dev" :: waited 0.000s inner /usr/local/lib/python2.7/dist-packages/oslo_concurrency/lockutils.py:444
  2015-03-30 14:55:58.941 ERROR nova.virt.disk.mount.nbd [req-df13155c-0340-4e10-aec4-2fabea382eef None None] nbd module not loaded

  We should not even enter the loop when /sys/block/nbd0 is clearly
  absent.

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