[Bug 271292] kernel panic while dd'ing a USB disk to a ZFS directory

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 07 May 2023 18:44:13 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271292

--- Comment #6 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Graham Perrin from comment #4)

zpool get should report disabled vs. enabled vs. active.

But I'll note that I referenced it because of it being a
pool level issue, not just zfs, and one that also leads
to incompatibility with older openzfs vintages. Even if
it is just enabled, there is no way back to disabled,
unless one has a zpool checkpoint that predates the
zpool upgrade and can revert to the checkpoint. (snapshots
need not be sufficient for pool feature problems.)

However, this openzfs import also had other corruption
generation problems not involving the block cloning
feature misbehavior. If one has snapshots predating the
corruptions that one can revert to being based on, these
may allow avoiding those specific corruptions. But that
will not deal with block cloning problems if some occured.

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