>So to be clear this patch revert fixes the issue being caused new, but,
if the issue already >happened on your filesystem it will continue to
occur because the exception is reporting >corruption on disk. I don't
currently

I don't think that's quite correct--- like the OP I can boot an older
kernel, with a pre-regression ZFS driver (ZFS 2.02), with the same
filesystem(s) (and the same/newest userspace library and utility
versions) on the same hardware and it works quite happily, without any
error or warning messages.  I'm not at all convinced that the error
message truly indicates irreparable filesystem damage--- there may not
even be anything wrong at all with the on-disk data structures, only in
the driver's in-memory reconstruction or interpretation of them.

I hit this bug after allowing a 20.04 LTS installation to upgrade from a
5.11.0-7620-generic kernel to the 5.13.0-7614-generic in stable.  The
panics occurred on every boot attempt under 5.13.0, at the same fairly
early point in the boot process (first page of kernel messages) every
time.  Rebooting with 5.11.0 doesn't generate any errors and has been
running stably for over two weeks (as it did for months before the
failed attempt to upgrade to 5.13.0).  The 5.11.0 build reports ZFS
module version v2.0.2-1ubuntu5, while the 5.13.0 has 2.0.3-8ubuntu6.  My
zfs package family is all 0.8.3-1ubuntu12.12.

It's annoying to get a regression like this in an LTS kernel, but at
least reverting is easy and seems effective.

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https://bugs.launchpad.net/bugs/1906476

Title:
  PANIC at zfs_znode.c:335:zfs_znode_sa_init() // VERIFY(0 ==
  sa_handle_get_from_db(zfsvfs->z_os, db, zp, SA_HDL_SHARED,
  &zp->z_sa_hdl)) failed

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