Re: Failure to boot after upgrade 14.3->14.4 with "ZFS: unsupported feature: com.klarasystems: vdev_zaps_v2"

Reply: Johan Helsingius : "Re: Failure to boot after upgrade 14.3->14.4 with "ZFS: unsupported feature: com.klarasystems: vdev_zaps_v2""
In reply to: Johan Helsingius : "Failure to boot after upgrade 14.3->14.4 with "ZFS: unsupported feature: com.klarasystems: vdev_zaps_v2""
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From: Daniel Tameling <tamelingdaniel_at_gmail.com>
Date: Thu, 30 Apr 2026 19:46:30 UTC

On Thu, Apr 30, 2026 at 11:33:18AM +0200, Johan Helsingius wrote:
> I was upgrading from 14.3-r7 to 14.4, but after the
> freebsd-update -r 14.4-RELEASE upgrade,
> the reboot fails with
> "ZFS: unsupported feature: com.klarasystems: vdev_zaps_v2"
> without loading the kernel.
> 
> Any idea what that feature is, and how to recover?
> 
> 	Julf
> 
> 

Google suggests that your bootloader doesn't support the features of the root partition. Did you perhaps do a "zfs upgrade"? You need to boot from external medium and update the bootloader.
 Depending on whether you use UEFI or Bios the steps differ.

Best regards,
Daniel