/var/log/cinder/volume.log shows the following error when converting a glance-registered QCOW2 image to a cinder volume.
local variable 'tmp' referenced before assignment failed to copy image to volume
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Create a temporary conversion directory and grant the cinder user and group ownership:
mkdir /images/conversion
chown cinder:cinder /images/conversion
Modify the image_conversion_dir directive in /etc/cinder/cinder.conf:
image_conversion_dir=/images/conversion
Restart the cinder volume service:
systemctl restart openstack-cinder-volume.service target.service