xfstest generic/042 run failed

I really do not know where is wrong:

root@ubuntu ~/xfstests# ./check generic/042

FSTYP         -- xfs (non-debug)
PLATFORM      -- Linux/x86_64 test 4.12.0-rc6
MKFS_OPTIONS  -- -f -bsize=4096 /dev/sda4

MOUNT_OPTIONS -- /dev/sda4 /fs/scratch

generic/042 - output mismatch (see ~/xfstests/results//generic/042.out.bad)

    --- tests/generic/042.out	2017-05-31 18:15:23.000000000 +0800
    +++ ~/xfstests/results//generic/042.out.bad	2017-06-28 11:02:01.111749909 +0800
    @@ -5,6 +5,16 @@
     fpunch
     wrote 65536/65536 bytes at offset 0
     XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
    +0000000 cdcd cdcd cdcd cdcd cdcd cdcd cdcd cdcd
    +*
    +000f000 0000 0000 0000 0000 0000 0000 0000 0000
    +*
    ...
    (Run 'diff -u tests/generic/042.out ~/xfstests/results//generic/042.out.bad'  to see the entire diff)

Ran: generic/042
Failures: generic/042
Failed 1 of 1 tests

falloc -k can work, but fpunch and fzero -k can not. I have little knowledge about them, could you help me?

Thanks
Dai Xiang