BTRFS Error Messages on boot while detecting Disks of KVMs

[ubu]

I get these error messages on booting the pve host, this is a zvol of a Linux kvm guest:

Feb 17 18:51:42 pve kernel: BTRFS error: device /dev/zd80p2 already registered with a higher generation, found 3423 expect 114966
Feb 17 18:51:42 pve kernel: BTRFS error: device /dev/zd64p2 already registered with a higher generation, found 3770 expect 114966
Feb 17 18:51:42 pve kernel: BTRFS error: device /dev/zd96p2 already registered with a higher generation, found 51775 expect 114966

Host Kernel:
Linux pve161 6.5.11-8-pve #1 SMP PREEMPT_DYNAMIC PMX 6.5.11-8 (2024-01-30T12:27Z) x86_64 GNU/Linux

 

[esi_y]

Zvol of a guest? But that's ... btrfs errors. What hardware are the subvolumes (?) on?

 

[ubu]

No the zvol is on the host, it is the Disk for the guest, the guest has ext4, but somehow the BTRFS driver probes these filesystems, i think erronously

 

[esi_y]

No the zvol is on the host, it is the Disk for the guest, the guest has ext4, but somehow the BTRFS driver probes these filesystems, i think erronously

I see, so btrfs driver looks at zvols that contain ext4 guests and thinks it's btrfs ... sounds like an item for Bugzilla.