System not booting after upgrade 14.3->14.4 with "ZFS: unsupported feature: com.klarasystems: vdev_zaps_v2"

Reply: Frank Leonhardt : "Re: System not booting after upgrade 14.3->14.4 with "ZFS: unsupported feature: com.klarasystems: vdev_zaps_v2""
Reply: Mark G.: "Re: System not booting 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 09:28:20 UTC

Hi all,

Was doing an upgrade from 14.3-R7 to 14.4, and after the freebsd-update
install, the reboot fails with "ZFS: unsupported feature:
com.klarasystems: vdev_zaps_v2"

Any idea what that feature is, and how to recover?

	Julf