v4.15 Final: GOOD

root@ubuntu:~# uname -r
4.15.0-041500-generic
root@ubuntu:~# mount /dev/sda /mnt 
root@ubuntu:~# grep sda /proc/mounts 
/dev/sda /mnt btrfs rw,relatime,space_cache,subvolid=5,subvol=/ 0 0
root@ubuntu:~# SPARSE="-S"; rm -rf /mnt/tmp; md5sum /usr/bin/python3.6; mkdir 
-p /mnt/tmp; cp -a /usr/bin/python3.6 /mnt/tmp; tar -C /mnt/tmp $SPARSE -czf 
/mnt/test.tgz .; tar $SPARSE -xzf /mnt/test.tgz -O | md5sum
e4121d2f3126b8c364bfa1aaa82371a3  /usr/bin/python3.6
e4121d2f3126b8c364bfa1aaa82371a3  -

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https://bugs.launchpad.net/bugs/1757565

Title:
  btrfs and tar sparse truncate archives

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