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Date:      Thu, 10 Dec 2020 05:11:32 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 251720] zfs receive does not accept data from old (FreeBSD 8) system.
Message-ID:  <bug-251720-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D251720

            Bug ID: 251720
           Summary: zfs receive does not accept data from old (FreeBSD 8)
                    system.
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: darius@dons.net.au

Created attachment 220419
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D220419&action=
=3Dedit
ZFS test stream (gzip'd)

Tested like so:
truncate -s 100M /tmp/zfs.1
sudo mdconfig -t vnode -f /tmp/zfs.1
sudo zpool create testtank /dev/md0
zcat test.zfssend.gz | sudo zfs recv -vd testtank
sudo zpool destroy testtank
sudo mdconfig -u md0 -d
rm /tmp/zfs.1

(test file is attached)

A bisect finds this commit is the culprit:
commit 46cdbe4a7a57c13eb35e99a5abea862ef346524f (HEAD)
Author: mmacy <mmacy@FreeBSD.org>
Date:   Sun Aug 12 00:45:53 2018 +0000

   MFV/ZoL: Implement large_dnode pool feature

   commit 50c957f702ea6d08a634e42f73e8a49931dd8055
   Author: Ned Bass <bass6@llnl.gov>
   Date:   Wed Mar 16 18:25:34 2016 -0700

       Implement large_dnode pool feature
...
Notes:
   svn path=3D/head/; revision=3D337669


I also tried creating the pool without features (ie zpool create -d) but no
change in behaviour.

Note that zstreamdump does not have any complaints about the stream.

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