[Bug 278440] [UFS] unxz makes a file which reports wrong usage block size by /usr/bin/du

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278440

            Bug ID: 278440
           Summary: [UFS] unxz makes a file which reports wrong usage
                    block size by /usr/bin/du
           Product: Base System
           Version: 14.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: uratan@miomio.jp

A file which reports wrong(?) disk block usage size is made
when /usr/bin/unxz-ing FreeBSD install image on UFS.

See the procedure below.
  +-------------------------------------------------------------------
  |% uname -a
  |FreeBSD oxygen 14.0-RELEASE FreeBSD 14.0-RELEASE #2: Fri Apr 12 13:31:59 JST
2024     uratan@oxygen:/usr/src/sys/i386/compile/OXYGEN i386
  |% df .
  |Filesystem  1M-blocks    Used Avail Capacity  Mounted on
  |/dev/ada0p5   3666866 3313160 60356    98%    /home
  |% mount | fgrep home
  |/dev/ada0p5 on /home (ufs, NFS exported, local, noatime, soft-updates)
  |
  |% ls
  |test0/
  |% ls -l test0/
  |total 638
  |-rwxrw-r--  1 nobody nobody 668057816 Apr 18 23:28
FreeBSD-14.0-RELEASE-i386-memstick.img.xz*
  |
  |% cp -pir test0 test1
  |
  |% cd test1
  |% unxz FreeBSD-14.0-RELEASE-i386-memstick.img.xz
  |% mkdir ../test2
  |% rsync FreeBSD-14.0-RELEASE-i386-memstick.img ../test2/
  |% cd ..
  |
  |% du test*
  |638     test0               <--- has downloaded *.img.xz
>>|909     test1               <--- /usr/bin/unxz it
>>|1041    test2               <--- copy *.img by /usr/local/bin/rsync
  |
  |% ls -lh test*
  |test0:
  |total 638
  |-rwxrw-r--  1 nobody nobody  637M Apr 18 23:28
FreeBSD-14.0-RELEASE-i386-memstick.img.xz*
  |test1:
>>|total 909
>>|-rwxrw-r--  1 uratan nobody  1.0G Apr 18 23:28 FreeBSD-14.0-RELEASE-i386-memstick.img*
  |test2:
>>|total 1041
>>|-rwxr--r--  1 uratan nobody  1.0G Apr 19 00:16 FreeBSD-14.0-RELEASE-i386-memstick.img*
  |
  |% sha256 test*/Free*
  |SHA256 (test0/FreeBSD-14.0-RELEASE-i386-memstick.img.xz) =
c558a19cf17deed6b93cee28356c1d405e2488127c57b7202cc296486308ac4d
  |SHA256 (test1/FreeBSD-14.0-RELEASE-i386-memstick.img) =
dd8a5d36f424d7d6448fb1350c033025c66909ebeecf8cee03baa6f25d23a640
  |SHA256 (test2/FreeBSD-14.0-RELEASE-i386-memstick.img) =
dd8a5d36f424d7d6448fb1350c033025c66909ebeecf8cee03baa6f25d23a640
  |
  +-------------------------------------------------------------------

Is this a BUG ? of which ?

 - * - * -

note.1
  The wrongness is also copied when copying the strange file
  by /bin/cp, /usr/bin/tar or /bin/cat > xxx.

note.2
  Also redirecting with 'xzcat *.img.xz > *.img' makes strange file.

note.3
  /bin/df also reports wrong(?) size.

note.4
  This phenomenon has been happening on my current home-server
  using FreeBSD 10.2R(i386).

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