Description of problem:
This should have been a straight forward conversion of a vdo stacked on md.

SCENARIO - multi_device_md_raid_lvm_import_vdo_convert: Test the conversion of a vdo stack on a multi device md raid volume
'echo y | mdadm --create --verbose /dev/md/lvm_import_vdo_sanity --level=1 --raid-devices=2 /dev/sde1 /dev/sdd1'
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store '/boot' on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=0.90
mdadm: size set to 1952840640K
mdadm: automatically enabling write-intent bitmap on large array
Continue creating array? mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md/lvm_import_vdo_sanity started.
vdo create --force --name lvm_import_vdo_sanity --vdoLogicalSize 500G --device /dev/md/lvm_import_vdo_sanity
Creating VDO lvm_import_vdo_sanity
The VDO volume can address 1 TB in 929 data slabs, each 2 GB.
It can grow to address at most 16 TB of physical storage in 8192 slabs.
If a larger maximum size might be needed, use bigger slabs.
Starting VDO lvm_import_vdo_sanity
Starting compression on VDO lvm_import_vdo_sanity
VDO instance 11 volume is ready at /dev/mapper/lvm_import_vdo_sanity

lvm_import_vdo --yes /dev/disk/by-id/md-uuid-d31d6734:f9e1b5da:18436589:110ca7da
Stopping VDO lvm_import_vdo_sanity
vdo: ERROR - Device lvm_import_vdo_sanity could not be converted; vdoprepareforlvm: Failed to convert the UDS index for usage with LVM: UDS Error: Index not saved cleanly
vdo: ERROR - vdoprepareforlvm: Failed to convert the UDS index for usage with LVM: UDS Error: Index not saved cleanly
Converting VDO lvm_import_vdo_sanity
lvm_import_vdo failed to convert volume on top of md raid)

May 2 11:30:50 hayes-01 qarshd[428633]: Running cmdline: vdo create --force --name lvm_import_vdo_sanity --vdoLogicalSize 500G --device /dev/md/lvm_import_vdo_sanity
May 2 11:30:55 hayes-01 kernel: kvdo11:dmsetup: underlying device, REQ_FLUSH: supported, REQ_FUA: supported
May 2 11:30:55 hayes-01 kernel: kvdo11:dmsetup: Using write policy async automatically.
May 2 11:30:55 hayes-01 kernel: kvdo11:dmsetup: loading device 'lvm_import_vdo_sanity'
May 2 11:30:55 hayes-01 kernel: kvdo11:dmsetup: zones: 1 logical, 1 physical, 1 hash; base threads: 5
May 2 11:30:56 hayes-01 kernel: kvdo11:dmsetup: starting device 'lvm_import_vdo_sanity'
May 2 11:30:56 hayes-01 systemd[1]: Starting Start VDO volume backed by md127...
May 2 11:30:56 hayes-01 kernel: kvdo11:journalQ: VDO commencing normal operation
May 2 11:30:56 hayes-01 kernel: kvdo11:dmsetup: Setting UDS index target state to online
May 2 11:30:56 hayes-01 kernel: uds: kvdo11:dedupeQ: creating index: dev=/dev/disk/by-id/md-uuid-d31d6734:f9e1b5da:18436589:110ca7da offset=4096 size=2781704192
May 2 11:30:56 hayes-01 kernel: kvdo11:dmsetup: device 'lvm_import_vdo_sanity' started
May 2 11:30:56 hayes-01 kernel: kvdo11:dmsetup: resuming device 'lvm_import_vdo_sanity'
May 2 11:30:56 hayes-01 kernel: kvdo11:dmsetup: device 'lvm_import_vdo_sanity' resumed
May 2 11:30:57 hayes-01 kernel: kvdo11:packerQ: compression is enabled
May 2 11:30:57 hayes-01 UDS/vdodmeventd[428683]: INFO (vdodmeventd/428683) VDO device lvm_import_vdo_sanity is now registered with dmeventd for monitoring
May 2 11:30:57 hayes-01 dmeventd[407530]: Monitoring VDO pool lvm_import_vdo_sanity.
May 2 11:30:57 hayes-01 vdo-by-dev[428676]: vdo: WARNING - VDO service lvm_import_vdo_sanity already started; no changes made
May 2 11:30:57 hayes-01 vdo[428676]: WARNING - VDO service lvm_import_vdo_sanity already started; no changes made
May 2 11:30:57 hayes-01 vdo-by-dev[428676]: Starting VDO lvm_import_vdo_sanity
May 2 11:30:57 hayes-01 vdo-by-dev[428676]: VDO instance 11 volume is ready at /dev/mapper/lvm_import_vdo_sanity
May 2 11:30:57 hayes-01 systemd[1]: Started Start VDO volume backed by md127.
May 2 11:30:57 hayes-01 systemd[1]: qarshd@10223-10.15.104.49:5016-10.2.17.116:37910.service: Succeeded.
May 2 11:30:57 hayes-01 systemd[1]: Started qarsh Per-Connection Server (10.2.17.116:37932).
May 2 11:30:57 hayes-01 qarshd[428694]: Talking to peer ::ffff:10.2.17.116:37932 (IPv6)
May 2 11:30:58 hayes-01 qarshd[428694]: Running cmdline: cat /etc/vdoconf.yml
May 2 11:30:58 hayes-01 systemd[1]: qarshd@10224-10.15.104.49:5016-10.2.17.116:37932.service: Succeeded.
May 2 11:30:58 hayes-01 systemd[1]: Started qarsh Per-Connection Server (10.2.17.116:37936).
May 2 11:30:58 hayes-01 qarshd[428699]: Talking to peer ::ffff:10.2.17.116:37936 (IPv6)
May 2 11:30:58 hayes-01 kernel: uds: kvdo11:dedupeQ: Using 16 indexing zones for concurrency.
May 2 11:30:59 hayes-01 qarshd[428699]: Running cmdline: lvm_import_vdo --yes /dev/disk/by-id/md-uuid-d31d6734:f9e1b5da:18436589:110ca7da
May 2 11:30:59 hayes-01 UDS/vdodmeventd[428775]: INFO (vdodmeventd/428775) VDO device lvm_import_vdo_sanity is now unregistered from dmeventd
May 2 11:30:59 hayes-01 dmeventd[407530]: No longer monitoring VDO pool lvm_import_vdo_sanity.
May 2 11:30:59 hayes-01 kernel: kvdo11:dmsetup: suspending device 'lvm_import_vdo_sanity'
May 2 11:30:59 hayes-01 kernel: kvdo11:dmsetup: device 'lvm_import_vdo_sanity' suspended
May 2 11:30:59 hayes-01 kernel: kvdo11:dmsetup: stopping device 'lvm_import_vdo_sanity'
May 2 11:30:59 hayes-01 kernel: kvdo11:dmsetup: device 'lvm_import_vdo_sanity' stopped
May 2 11:30:59 hayes-01 UDS/vdoprepareforlvm[428784]: NOTICE (vdoprepareforlv/428784) loading index: /dev/disk/by-id/md-uuid-d31d6734:f9e1b5da:18436589:110ca7da offset=4096
May 2 11:30:59 hayes-01 UDS/vdoprepareforlvm[428784]: INFO (vdoprepareforlv/428784) Using 1 indexing zone for concurrency.
May 2 11:31:00 hayes-01 UDS/vdoprepareforlvm[428784]: ERROR (vdoprepareforlv/428784) index could not be loaded: UDS Error: Index not saved cleanly (1069)
May 2 11:31:00 hayes-01 UDS/vdoprepareforlvm[428784]: CRITICAL (vdoprepareforlv/428784) fatal error in makeIndex: UDS Error: Index not saved cleanly (1069)
May 2 11:31:00 hayes-01 UDS/vdoprepareforlvm[428784]: ERROR (vdoprepareforlv/428784) failed to create index: Unrecoverable error: UDS Error: Index not saved cleanly (132141)
May 2 11:31:00 hayes-01 UDS/vdoprepareforlvm[428784]: ERROR (vdoprepareforlv/428784) Failed to make router: Unrecoverable error: UDS Error: Index not saved cleanly (132141)
May 2 11:31:00 hayes-01 UDS/vdoprepareforlvm[428784]: ERROR (vdoprepareforlv/428784) Failed loading index: Unrecoverable error: UDS Error: Index not saved cleanly (132141)
May 2 11:31:00 hayes-01 UDS/vdoprepareforlvm[428784]: WARN (vdoprepareforlv/428784) Error closing index: UDS Error: Index session not known (1035)
May 2 11:31:00 hayes-01 vdo[428781]: ERROR - Device lvm_import_vdo_sanity could not be converted; vdoprepareforlvm: Failed to convert the UDS index for usage with LVM: UDS Error: Index not saved cleanly
May 2 11:31:00 hayes-01 vdo[428781]: ERROR - vdoprepareforlvm: Failed to convert the UDS index for usage with LVM: UDS Error: Index not saved cleanly

Version-Release number of selected component (if applicable):
kernel-4.18.0-372.5.1.el8 BUILT: Mon Mar 28 10:29:22 CDT 2022
lvm2-2.03.14-3.el8 BUILT: Tue Jan 4 14:54:16 CST 2022
lvm2-libs-2.03.14-3.el8 BUILT: Tue Jan 4 14:54:16 CST 2022

vdo-6.2.6.14-14.el8 BUILT: Fri Feb 11 14:43:08 CST 2022
kmod-kvdo-6.2.6.14-84.el8 BUILT: Tue Mar 22 07:41:18 CDT 2022