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

Reply: Daniel Tameling : "Re: Failure to boot after upgrade 14.3->14.4 with "ZFS: unsupported feature: com.klarasystems: vdev_zaps_v2""
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From: Johan Helsingius <julf_at_Julf.com>
Date: Thu, 30 Apr 2026 09:33:18 UTC

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