I've just reported a bug (https://bugzilla.kernel.org/show_bug.cgi?id=195597) that hit me after recent update of btrfs-progs.
It seems to be a false-positive that resulted from the changes that aimed to fix another issue. Short version of it is following: root@nazar-pc:~# /bin/btrfs send "/media/Backup/web/2017-04-04_14:30:06" | /bin/btrfs receive "/media/Backup_backup/web" At subvol /media/Backup/web/2017-04-04_14:30:06 At subvol 2017-04-04_14:30:06 ERROR: empty stream is not considered valid I've also added Stéphane Graber to CC as the author of the recent update to Ubuntu's btrfs-progs package. I'm not subscribed to the mailing list, so keep me in copy, please. -- Sincerely, Nazar Mokrynskyi github.com/nazar-pc Tox: A9D95C9AA5F7A3ED75D83D0292E22ACE84BA40E912185939414475AF28FD2B2A5C8EF5261249 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html