Incus fails to bring lvm loopback pool online

Incus
1

I have an Incus 6.12 instance on Debian Trixie with a loopback LVM pool (I would have set it up to use block device, but it refused to integrate into the existing LVM, so I went for the loopback option for testing).
Today, one of the containers decided to write so much data to the pool that the underlying disk got completely filled up. So I resized the host system root partition to make enough room, everything is fine again on that front. However, Incus is not able to bring up the containers anymore:

Failed to activate LVM logical volume "/dev/incus-pool/containers_Pi--hole": Failed to run: lvchange --activate y --ignoreactivationskip /dev/incus-pool/containers_Pi--hole: exit status 5 (Check of pool incus-pool/IncusThinPool failed (status:64). Manual repair required!)

And this is where it gets strange: the path /dev/incus-pool does not even exist! The pool itself is present in /var/lib/incus/disk/incus-pool.img, and also the loopback seems to be set:

losetup -a
/dev/loop0: [65024]:525125 (/var/lib/incus/disks/incus-pool.img)

Also, LVM seems to see everything correctly:

root@zim:/home/locu# lvs
  LV                                                                      VG         Attr       LSize   Pool          Origin              Data%  Meta%  Move Log Cpy%Sync Convert
  IncusThinPool                                                           incus-pool twi---tz--  49.89g                                                                          
  containers_ArchiSteamFarm                                               incus-pool Vwi---tz-k  10.00g IncusThinPool                                                            
  containers_Jellyfin                                                     incus-pool Vwi---tz-k  10.00g IncusThinPool                                                            
  containers_Pi--hole                                                     incus-pool Vwi---tz-k  10.00g IncusThinPool                                                            
  containers_Pi--hole-current_working                                     incus-pool Vri---tz-k  10.00g IncusThinPool containers_Pi--hole                                        
  containers_tvstuff                                                      incus-pool Vwi---tz-k  10.00g IncusThinPool                                                            
  containers_tvstuff-current_working                                      incus-pool Vri---tz-k  10.00g IncusThinPool containers_tvstuff                                         
  images_c4f17b293ea6413a120b169de518c2a75c72c311281cc45ddabbcc8500be4c2e incus-pool Vwi---tz-k  10.00g IncusThinPool                                                            
  home                                                                    zim-vg     -wi-ao---- <66.30g                                                                                                                                                   
  root                                                                    zim-vg     -wi-ao---- <72.94g                                                                          
  swap_1                                                                  zim-vg     -wi-ao---- 976.00m                                                                          
root@zim:/home/locu# pvs
  PV             VG         Fmt  Attr PSize   PFree  
  /dev/loop0     incus-pool lvm2 a--  <50.00g      0 
  /dev/nvme1n1p3 zim-vg     lvm2 a--  475.96g 235.77g
root@zim:/home/locu# vgdisplay incus-pool
  --- Volume group ---
  VG Name               incus-pool
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  188
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                8
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <50.00 GiB
  PE Size               4.00 MiB
  Total PE              12799
  Alloc PE / Size       12799 / <50.00 GiB
  Free  PE / Size       0 / 0   
  VG UUID               d9kUDu-oYaI-qZ2M-LPFG-tQSn-yF9l-bKZAK1
root@zim:/home/locu# lvdisplay incus-pool
  --- Logical volume ---
  LV Name                IncusThinPool
  VG Name                incus-pool
  LV UUID                A8ycwe-K2EN-3RN9-FtJs-XM0n-r9UZ-bLoND0
  LV Write Access        read/write
  LV Creation host, time zim, 2025-04-07 13:12:43 +0200
  LV Pool metadata       IncusThinPool_tmeta
  LV Pool data           IncusThinPool_tdata
  LV Status              NOT available
  LV Size                49.89 GiB
  Current LE             12773
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
   
  --- Logical volume ---
  LV Path                /dev/incus-pool/containers_Pi--hole
  LV Name                containers_Pi--hole
  VG Name                incus-pool
  LV UUID                pufF3d-ewG4-nVbM-SwsV-3U0G-lWc0-XYxH3i
  LV Write Access        read/write
  LV Creation host, time zim, 2025-04-07 13:42:33 +0200
  LV Pool name           IncusThinPool
  LV Status              NOT available
  LV Size                10.00 GiB
  Current LE             2560
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
   
  --- Logical volume ---
  LV Path                /dev/incus-pool/containers_tvstuff
  LV Name                containers_tvstuff
  VG Name                incus-pool
  LV UUID                X72SyS-RHpi-6K7m-X6kd-d9HA-MlGw-1QUKSd
  LV Write Access        read/write
  LV Creation host, time zim, 2025-04-07 19:54:37 +0200
  LV Pool name           IncusThinPool
  LV Status              NOT available
  LV Size                10.00 GiB
  Current LE             2560
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
   
  --- Logical volume ---
  LV Path                /dev/incus-pool/containers_tvstuff-current_working
  LV Name                containers_tvstuff-current_working
  VG Name                incus-pool
  LV UUID                kWkfJp-Gxgu-iGxB-ugsE-Gu3M-mhg2-QoB8qR
  LV Write Access        read only
  LV Creation host, time zim, 2025-04-15 12:58:44 +0200
  LV Pool name           IncusThinPool
  LV Thin origin name    containers_tvstuff
  LV Status              NOT available
  LV Size                10.00 GiB
  Current LE             2560
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
   
  --- Logical volume ---
  LV Path                /dev/incus-pool/containers_Pi--hole-current_working
  LV Name                containers_Pi--hole-current_working
  VG Name                incus-pool
  LV UUID                30mOOT-jXW5-TPUH-6DsR-yPAZ-gcXZ-dd198R
  LV Write Access        read only
  LV Creation host, time zim, 2025-04-15 12:58:56 +0200
  LV Pool name           IncusThinPool
  LV Thin origin name    containers_Pi--hole
  LV Status              NOT available
  LV Size                10.00 GiB
  Current LE             2560
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
   
  --- Logical volume ---
  LV Path                /dev/incus-pool/containers_Jellyfin
  LV Name                containers_Jellyfin
  VG Name                incus-pool
  LV UUID                eYrXcG-Nmfl-UQWl-TVaA-AATA-Q6jn-v23Lzk
  LV Write Access        read/write
  LV Creation host, time zim, 2025-04-15 13:00:55 +0200
  LV Pool name           IncusThinPool
  LV Status              NOT available
  LV Size                10.00 GiB
  Current LE             2560
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
   
  --- Logical volume ---
  LV Path                /dev/incus-pool/containers_ArchiSteamFarm
  LV Name                containers_ArchiSteamFarm
  VG Name                incus-pool
  LV UUID                zLNFGL-VhRm-JC5Q-KnzD-J1WX-UnJX-cOI6Zs
  LV Write Access        read/write
  LV Creation host, time zim, 2025-04-27 21:08:45 +0200
  LV Pool name           IncusThinPool
  LV Status              NOT available
  LV Size                10.00 GiB
  Current LE             2560
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
   
  --- Logical volume ---
  LV Path                /dev/incus-pool/images_c4f17b293ea6413a120b169de518c2a75c72c311281cc45ddabbcc8500be4c2e
  LV Name                images_c4f17b293ea6413a120b169de518c2a75c72c311281cc45ddabbcc8500be4c2e
  VG Name                incus-pool
  LV UUID                McXd6w-aKd1-qIv9-ulgk-bI2x-TcLD-utzBKw
  LV Write Access        read/write
  LV Creation host, time zim, 2025-04-28 15:38:44 +0200
  LV Pool name           IncusThinPool
  LV Status              NOT available
  LV Size                10.00 GiB
  Current LE             2560
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto

I am not certain if this is related to the .img file being corrupted in some way, the LVM in the img file being broken, some updates that came in since the last reboot, or some other completely unrelated error, but I know that everything was working fine this morning with multiple containers running.

My best guess currently is that the problem lies somewhere between the loopback and LVM since the LVM data also points to /dev/incus-pool.

So: How do I do the manual repair that is requested and get everything running again?

2

So I made a little progress at least: I copied the .img file to another computer, set it up with losetup to a loopback, then created a second .img-file with some GB size, set this up as a second loop, then used this second loop to extend the pvs, did a repair on the IncusThinPool. Now /dev/incus-pool is showing up, however not the partitions that should be inside the Thinpool, only IncusThinPool_meta[0|1]. So apparently, the problem is mainly related to the LVM Thinpool. But still I am not able to at least access my data and save some of this.