[Bug 1862149] Re: Cinder: Extend in-use volume fails

[Chris MacNaughton]

** Also affects: cloud-archive/queens
   Importance: Undecided
       Status: New

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Title:
  Cinder: Extend in-use volume fails

Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive queens series:
  New

Bug description:
  Resizing a volume that is in use fails and the volume ends up in
  error_extending state.

  
  $ OS_VOLUME_API_VERSION=3.42 cinder -v  extend 006e4fcc-aa4d-414b-981c-5b2360d30202 33
  $ openstack volume list
  +--------------------------------------+--------------------------+-----------------+------+-----------------------------------------------+
  | ID                                   | Display Name             | Status          | Size | Attached to                                   |
  +--------------------------------------+--------------------------+-----------------+------+-----------------------------------------------+
  | 43ecd3fa-185e-49ac-99aa-d1fc569ee4ac | abcde-example-server_db  | error_extending |   30 | Attached to abcde-example-server on /dev/vdb  |
  +--------------------------------------+--------------------------+-----------------+------+-----------------------------------------------+

  
  The cinder API accepts the request but the actual resize of the qemu image file fails. 

  The cinder log file shows a Qemu file locking error

  
  /var/log/cinder/cinder-volume.log:Command: qemu-img resize /var/lib/cinder/mnt/1f1346fd5f978eba20ba745787697239/volume-43ecd3fa-185e-49ac-99aa-d1fc569ee4ac 50G
  /var/log/cinder/cinder-volume.log:Stderr: u'WARNING: Image format was not specified for \'/var/lib/cinder/mnt/1f1346fd5f978eba20ba745787697239/volume-43ecd3fa-185e-49ac-99aa-d1fc569ee4ac\' and probing guessed raw.\n         Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.\n         Specify the \'raw\' format explicitly to remove the restrictions.\nqemu-img: Could not open \'/var/lib/cinder/mnt/1f1346fd5f978eba20ba745787697239/volume-43ecd3fa-185e-49ac-99aa-d1fc569ee4ac\': Failed to get "write" lock\nIs another process using the image?\n'
  /var/log/cinder/cinder-volume.log:2020-02-06 10:13:17.087 12523 ERROR cinder.volume.manager Command: qemu-img resize /var/lib/cinder/mnt/1f1346fd5f978eba20ba745787697239/volume-43ecd3fa-185e-49ac-99aa-d1fc569ee4ac 50G
  /var/log/cinder/cinder-volume.log:2020-02-06 10:13:17.087 12523 ERROR cinder.volume.manager Stderr: u'WARNING: Image format was not specified for \'/var/lib/cinder/mnt/1f1346fd5f978eba20ba745787697239/volume-43ecd3fa-185e-49ac-99aa-d1fc569ee4ac\' and probing guessed raw.\n         Automatically detecting the format is dangerous for raw images, write operations on block 0 will be restricted.\n         Specify the \'raw\' format explicitly to remove the restrictions.\nqemu-img: Could not open \'/var/lib/cinder/mnt/1f1346fd5f978eba20ba745787697239/volume-43ecd3fa-185e-49ac-99aa-d1fc569ee4ac\': Failed to get "write" lock\nIs another process using the image?\n'

  
  The same command worked with an instance still running qemu 2.9 

  
  Used versions:
  Cinder: 12.0.9-0ubuntu1
  Qemu: 1:2.11+dfsg-1ubuntu7.21~cloud0
  libvirt: 4.0.0-1ubuntu8.14~cloud0

  I am using Quobyte as Cinder driver.

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