There were no error logs in vdsm and supervdsm.

And I found that the 
[org.ovirt.engine.core.bll.storage.disk.managedblock.DisconnectManagedBlockStorageDeviceCommand]
 and 
[org.ovirt.engine.core.vdsbroker.vdsbroker.DetachManagedBlockStorageVolumeVDSCommand]
 functions are being called when the disk is detached from ovirt vm.

However, in the log I gave first, there is no part where the correspoding 
functions are called, isn't it a bug?

Here is the engine log where detaching the disk:

2021-08-23 10:29:43,972+09 INFO  
[org.ovirt.engine.core.bll.storage.disk.HotUnPlugDiskFromVmCommand] (default 
task-176) [2538ba78-6916-431c-b3bc-b98b26515842] Lock Acquired to object 
'EngineLock:{exclusiveLocks='[f17702e4-ba97-4f95-a6d4-b89de003bd26=DISK]', 
sharedLocks='[59a7461c-72fe-4e01-86a7-c70243f31596=VM]'}'
2021-08-23 10:29:44,054+09 INFO  
[org.ovirt.engine.core.bll.storage.disk.HotUnPlugDiskFromVmCommand] 
(EE-ManagedThreadFactory-engine-Thread-149928) 
[2538ba78-6916-431c-b3bc-b98b26515842] Running command: 
HotUnPlugDiskFromVmCommand internal: false. Entities affected :  ID: 
59a7461c-72fe-4e01-86a7-c70243f31596 Type: VMAction group CONFIGURE_VM_STORAGE 
with role type USER
2021-08-23 10:29:44,076+09 INFO  
[org.ovirt.engine.core.vdsbroker.vdsbroker.HotUnPlugDiskVDSCommand] 
(EE-ManagedThreadFactory-engine-Thread-149928) 
[2538ba78-6916-431c-b3bc-b98b26515842] START, HotUnPlugDiskVDSCommand(HostName 
= host, 
HotPlugDiskVDSParameters:{hostId='29dc5d53-7ec5-4a38-aaf1-c6eaf32b0094', 
vmId='59a7461c-72fe-4e01-86a7-c70243f31596', 
diskId='f17702e4-ba97-4f95-a6d4-b89de003bd26'}), log id: 1c39f09a
2021-08-23 10:29:44,078+09 INFO  
[org.ovirt.engine.core.vdsbroker.vdsbroker.HotUnPlugDiskVDSCommand] 
(EE-ManagedThreadFactory-engine-Thread-149928) 
[2538ba78-6916-431c-b3bc-b98b26515842] Disk hot-unplug: <?xml version="1.0" 
encoding="UTF-8"?><hotunplug>
  <devices>
    <disk>
      <alias name="ua-f17702e4-ba97-4f95-a6d4-b89de003bd26"/>
    </disk>
  </devices>
</hotunplug>

2021-08-23 10:29:44,218+09 INFO  
[org.ovirt.engine.core.vdsbroker.vdsbroker.HotUnPlugDiskVDSCommand] 
(EE-ManagedThreadFactory-engine-Thread-149928) 
[2538ba78-6916-431c-b3bc-b98b26515842] FINISH, HotUnPlugDiskVDSCommand, return: 
, log id: 1c39f09a
2021-08-23 10:29:44,471+09 INFO  
[org.ovirt.engine.core.bll.storage.disk.managedblock.DisconnectManagedBlockStorageDeviceCommand]
 (EE-ManagedThreadFactory-engine-Thread-149928) [2a452b04] Running command: 
DisconnectManagedBlockStorageDeviceCommand internal: true.
2021-08-23 10:29:44,514+09 INFO  
[org.ovirt.engine.core.vdsbroker.vdsbroker.DetachManagedBlockStorageVolumeVDSCommand]
 (EE-ManagedThreadFactory-engine-Thread-149928) [2a452b04] START, 
DetachManagedBlockStorageVolumeVDSCommand(HostName = host, 
AttachManagedBlockStorageVolumeVDSCommandParameters:{hostId='29dc5d53-7ec5-4a38-aaf1-c6eaf32b0094',
 vds='Host[host,29dc5d53-7ec5-4a38-aaf1-c6eaf32b0094]'}), log id: 2d6874a5
2021-08-23 10:29:46,683+09 INFO  
[org.ovirt.engine.core.vdsbroker.vdsbroker.DetachManagedBlockStorageVolumeVDSCommand]
 (EE-ManagedThreadFactory-engine-Thread-149928) [2a452b04] FINISH, 
DetachManagedBlockStorageVolumeVDSCommand, return: StatusOnlyReturn 
[status=Status [code=0, message=Done]], log id: 2d6874a5
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