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issue while detaching volume (FC type) from instance

Hey all, lately I added a second tier for my cinder backend, an FC storage type. all the setup goes well the service was up and I was able to execute any task related to the capability of the driver. just except detach and apparently it also affected when the instance goes for a reboot. the same main error that shown

"Stdout: u'Jul 15 02:46:50 | /dev/disk/by-id/dm-uuid-mpath-20024f400554505a0: map in use\nJul 15 02:46:50 | failed to remove multipath map /dev/disk/by-id/dm-uuid-mpath-20024f400554505a0\n' Stderr: u'': ProcessExecutionError: Unexpected error while running command. 2019-07-15 02:47:30.904 8111 INFO nova.compute.manager [req-28dce3d5-3412-412e-9bc7-a0be5e921bf9 3a67a05137e5a2e48c975dab3ed0d493c890ae27f5f343f567a59a487a465ce5 7d91af2e9c8c4dc392f61437ad932ba2 - d70a4991744248d9a6733356e668dfc6 d70a4991744248d9a6733356e668dfc6] [instance: 1649960c-dbff-4776-b6a5-c0719af2a130] Successfully reverted task state from reboot_started_hard on failure for instance. 2019-07-15 02:47:30.947 8111 ERROR oslo_messaging.rpc.server [req-28dce3d5-3412-412e-9bc7-a0be5e921bf9 3a67a05137e5a2e48c975dab3ed0d493c890ae27f5f343f567a59a487a465ce5 7d91af2e9c8c4dc392f61437ad932ba2 - d70a4991744248d9a6733356e668dfc6 d70a4991744248d9a6733356e668dfc6] Exception during message handling: ProcessExecutionError: Unexpected error while running command. Command: multipath -f /dev/disk/by-id/dm-uuid-mpath-20024f400554505a0 "

as a workaround, I running "echo 1 > /sys/bus/scsi/drivers/sd/$DEVICE/delete" and then seems he succeeded to run after "multipath -f"

Anyone also interrupts in this issue and can help me here? Thanks.

I running queens 17.1.9 deployed by openstack-ansible