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Cannot block migrate instance with mapped volumes to caller

Hello, when I try to block migrate an instance attached to a volume, I get this exception and the migration fails:

Returning exception Migration pre-check error: Cannot block migrate instance 5f9f8015-d347-486e-9021-8ba6101bed68 with mapped volumes to caller

The block migration works when the instance is not attached and when it has a shared storage. Have you any idea what the problem is? I already tried to use the option: --block-device-mapping in nova live-migration but it did not resolve the issue.

I use liberty version of openstack.