samba-tool domain backup with lmdb on btrfs fails

[Jeremy Allison]

On Tue, Feb 14, 2023 at 09:13:51PM +0100, Andreas Schneider via samba-technical wrote:
>
>I think I found it:
>
>The issue is the lmdb mdb_copy command on btrfs
>
>
>
>     def offline_mdb_copy(self, path):
>+        mdb_chksum = create_file_checksum(path)
>         mdb_copy(path, path + self.backup_ext)
>+        mdb_copy_chksum = create_file_checksum(path + self.backup_ext)
>+        if mdb_chksum != mdb_copy_chksum:
>+            raise CommandError("FATAL: MDB checksums don't match!")
>
>
>This triggers on btrfs and works on ext4!
>
>
>I will prepare a reproducer tomorrow.

Fantasic debugging Andreas ! That narrows it down perfectly.