"thin_repair" command gives error 'you cannot run this tool with these options on live metadata'

Issue

• thin_repair command fails with message "you cannot run this tool with these options on live metadata"

# thin_repair -i /dev/mapper/VG-mypool00_tmeta -o /dev/VG/newmetaLV
syscall 'open' failed: Device or resource busy
Note: you cannot run this tool with these options on live metadata.

• How to repair thinpool metadata when "/" is a thinLV in the same pool.

Filesystem            1K-blocks     Used Available Use% Mounted on
/dev/mapper/VG-root 158384576 17999660 140384916  12% /

Name              Maj Min Stat Open Targ Event  UUID                                                                      
VG-swap         253   4 L--w    2    1      0 LVM-4jvjo12345678kTPqeDAaPNa2uPDFCnLEOhTerHTMABCDEFGH85KkcdHsNd166Pm      
VG-root         253   3 L--w    1    1      0 LVM-4jvjo4fgw2OcckTPqeDAABCDEFGH123456lIdkBzoPfFex1tpHoA8Kh0AyTWVef5 

Aug 12 13:45:51 hostname lvm[880]: WARNING: Thin pool VG-mypool00-tpool metadata is now 98.05% full.
Aug 12 13:45:51 hostname lvm[880]: WARNING: Thin pool VG-mypool00-tpool data is now 91.04% full.

Aug 12 18:17:30 hostname kernel: device-mapper: thin: No free metadata blocks
Aug 12 18:17:30 hostname kernel: device-mapper: thin: 253:2: switching pool to read-only mode
Aug 12 18:17:31 hostname lvm[880]: WARNING: Thin pool VG-mypool00-tpool metadata is now 100.00% full.
Aug 12 18:17:31 hostname kernel: dm-3: writeback error on inode 470035623, offset 559415296, sector 285794304
Aug 12 18:17:31 hostname kernel: dm-3: writeback error on inode 470035624, offset 0, sector 286798720
Aug 12 18:17:31 hostname kernel: dm-3: writeback error on inode 470035623, offset 664272896, sector 285999104
Aug 12 18:17:32 hostname kernel: dm-3: writeback error on inode 470035624, offset 104857600, sector 287003520
Aug 12 18:17:32 hostname kernel: dm-3: writeback error on inode 470035623, offset 769130496, sector 286203904
Aug 12 18:17:32 hostname kernel: dm-3: writeback error on inode 470035624, offset 209715200, sector 287208320
Aug 12 18:17:32 hostname kernel: dm-3: writeback error on inode 470035623, offset 873988096, sector 286408704