The system uses xattr=sa, but I did not set it myself. Like you can see
in the annex, it has been inherited from rpool everywhere and it has
been set by the installer. 

I annexed the properties
- Home of Ubuntu, which properties I did not touch at all (except
canmount) and 
- my main dataset with my VMs (rpool/vms/Vbox), where I only changed
its dnodesize and snapdir. 

The last one (rpool/vms/Vbox) I backup weekly to FreeBSD 12.1. 
For my last try-outs I did use the Home directory of Ubuntu and that
one failed. 

The only significant difference, I notice between the two datasets, is
dnodesize. I made the .zfs folder visible this year to restore a VM.

Remark: I use the experimental Ubuntu install with Root on ZFS, but I
also have an ext4 installation on the PC, so I dual boot. Kind of last
resort for the experimental install. In say October and November to be
able to update ZFS on the ext4 installation, I had to change canmount
during the update, but I think that bug has been solved. Canmount is
back at its default.


On Fri, 2020-01-31 at 13:24 +0000, Garrett Fields wrote:
> I quickly set up a VM last night and tried to recreate problem, I
> have
> been unsuccessful so far.  I'm wondering if certain dnode data
> (perhaps
> the use of xattr=sa on the Linux source) might be triggering the
> issue?
> 


** Attachment added: "properties"
   https://bugs.launchpad.net/bugs/1854982/+attachment/5324493/+files/properties

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https://bugs.launchpad.net/bugs/1854982

Title:
  Lost compatibilty for backup between Ubuntu 19.10 and FreeBSD 12.0

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