Comment 4 for bug 1842437

original package:
--------

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

# LIBBLKID_DEBUG=all udevadm test-builtin blkid /sys/block/loop0/loop0p1
...
4924: libblkid: LOWPROBE: [28] ext4:
4924: libblkid: LOWPROBE: reuse buffer: off=1024 len=1024 pr=0x55fe3cbdcec0
4924: libblkid: LOWPROBE: magic sboff=56, kboff=1
4924: libblkid: LOWPROBE: call probefunc()
4924: libblkid: LOWPROBE: reuse buffer: off=1024 len=1024 pr=0x55fe3cbdcec0
4924: libblkid: PROBE: ext2_sb.compat = 0000003C:00000246:0000007B
4924: libblkid: LOWPROBE: assigning UUID [superblocks]
4924: libblkid: LOWPROBE: assigning VERSION [superblocks]
4924: libblkid: LOWPROBE: assigning TYPE [superblocks]
4924: libblkid: LOWPROBE: assigning USAGE [superblocks]
...
4924: libblkid: LOWPROBE: [63] nilfs2:
4924: libblkid: LOWPROBE: call probefunc()
4924: libblkid: LOWPROBE: reuse buffer: off=1024 len=1024 pr=0x55fe3cbdcec0
4924: libblkid: LOWPROBE: reuse buffer: off=1072689152 len=4096 pr=0x55fe3cbdcec0
4924: libblkid: LOWPROBE: incorrect checksum for type nilfs2, got 46498012, expected 2D2D206B
4924: libblkid: LOWPROBE: assigning SBBADCSUM [superblocks]
4924: libblkid: LOWPROBE: nilfs2: primary=0, backup=1, swap=1
4924: libblkid: LOWPROBE: assigning LABEL [superblocks]
4924: libblkid: LOWPROBE: assigning UUID [superblocks]
4924: libblkid: LOWPROBE: assigning VERSION [superblocks]
4924: libblkid: LOWPROBE: assigning TYPE [superblocks]
4924: libblkid: LOWPROBE: assigning USAGE [superblocks]
...
4924: libblkid: LOWPROBE: ERROR: superblocks chain: ambivalent result detected (2 filesystems)!
...
# echo $?
1