Using LVM on a cinder volume exposes the data to the host

Issue

The following issues may appear on the computes or the controllers in the environment

• LVM appears to be see volume groups from my guests
• LVM is reporting that there are duplicate volume group names

• Volume detachments fail because the multipath device is still used

  2021-07-12 12:34:56.789 8 ERROR oslo_messaging.rpc.server [...] Exception during message handling: ProcessExecutionError: Unexpected error while running command.
  Command: multipath -f <wwn>
  Exit code: 1
  Stdout: u'Jul 12 12:34:56 | <wwn>1: map in use\nJul 12 12:34:56 | failed to remove multipath map <wwn>\n'
  Stderr: u''
  

• My guests fail to boot due to problems with LVM

• The LVM on my guest machine is in a partial state due to a missing disk that actually exists
• Cinder actions fail on devices that have LVM built on them

• Cinder snapshots fail to remove correctly

  Nov 22 16:22:52 overcloud-volume01 cinder-volume[28404]: Stdout: u"Unexpected error while running command.\nCommand: sudo cinder-rootwrap /etc/cinder/rootwrap.conf lvremove --config activation { retry_deactivation = 1} devices { ignore_suspended_devices = 1} -f cinder-volumes/_snapshot-<UUID>\nExit code: 5\nStdout: u''\nStderr: u'File descriptor 7 (/dev/urandom) leaked on lvremove invocation. Parent PID 39750: /usr/bin/python2\\n  Logical volume cinder-volumes/_snapshot-<UUID> is used by another device.\\n'"