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
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https://bugs.launchpad.net/bugs/1842437
Title:
Xenial: libblkid: fix false-positive/misdetection of nilfs2 filesystem
with udev
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