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Live Migration failure: internal error: unexpected migration status in cancelling

Hello everyone,

I'm getting the following error when live migrating instances from an host to another:

Live Migration failure: internal error: unexpected migration status in cancelling

To start the live migration I use the following command:

openstack server migrate --block-migration --disk-overcommit 509aa926-f78e-44fc-b70d-01daaaadddff5 --live compute22.nest.org --wait

The migration fails randomly, sometimes at 20%, others at 80%... If I execute the migration command multiple times the VM will eventually be migrated.

I've tried to increase the nova log level but the error doesn't get any clearer.

Any ideas on how to get more information on this error or how to solve it?

Thank you and best regards,

Vincenzo