Comment 5 for bug 1842437

modified package:
--------

# dpkg -s libblkid1 | grep ^Version:
Version: 2.27.1-6ubuntu3.8+test20190903b1

# LIBBLKID_DEBUG=all udevadm test-builtin blkid /sys/block/loop0/loop0p1
...
7289: libblkid: LOWPROBE: [28] ext4:
7289: libblkid: LOWPROBE: reuse buffer: off=1024 len=1024 pr=0x5604292b7ec0
7289: libblkid: LOWPROBE: magic sboff=56, kboff=1
7289: libblkid: LOWPROBE: call probefunc()
7289: libblkid: LOWPROBE: reuse buffer: off=1024 len=1024 pr=0x5604292b7ec0
7289: libblkid: PROBE: ext2_sb.compat = 0000003C:00000246:0000007B
7289: libblkid: LOWPROBE: assigning UUID [superblocks]
7289: libblkid: LOWPROBE: assigning VERSION [superblocks]
7289: libblkid: LOWPROBE: assigning TYPE [superblocks]
7289: libblkid: LOWPROBE: assigning USAGE [superblocks]
...
7289: libblkid: LOWPROBE: [63] nilfs2:
7289: libblkid: LOWPROBE: call probefunc()
7289: libblkid: LOWPROBE: reuse buffer: off=1024 len=1024 pr=0x5604292b7ec0
7289: libblkid: LOWPROBE: reuse buffer: off=1072689152 len=4096 pr=0x5604292b7ec0
7289: libblkid: LOWPROBE: [64] exfat:
...
7289: libblkid: LOWPROBE: returning UUID value
ID_FS_UUID=bac40f54-41c7-4a5a-a3f2-87bf23546e9c
...
# echo $?
0