[Bug 1820874] [NEW] [xenial] udev cannot identify fs uuid by builtin blkid (fixed in upstream)

[Konstantin Khlebnikov]

Public bug reported:

see upstream bug https://github.com/systemd/systemd/issues/6110

fix
https://github.com/poettering/systemd/commit/e2c48187ccb9668dab9f025c9c4228e97927179f

udev calls libblkid with flag BLKID_SUBLKS_BADCSUM to see all superblocks but
data in filesystem could be detected as broken superblock of other filesystem:

root at vla2-4101:~# wipefs -n /dev/sdf2 
offset               type
----------------------------------------------------------------
0xae9c36ff006        nilfs2   [filesystem]
                     LABEL:  9-627f5c82-a8f363c9-a716ffb1)	ea9a210be67212ac	ffff0ae104ca29ef	
2019-02-14 05:
                     UUID:  2c205265-6164-5365-7373-696f6e49643a

0x438                ext4   [filesystem]
                     LABEL: /yt/disk5
                     UUID:  778742b8-1ac6-45cf-a459-2f7919ba5dd4


normal blkid is fine

root at vla2-4101:~# blkid -p /dev/sdf2 
/dev/sdf2: LABEL="/yt/disk5" UUID="778742b8-1ac6-45cf-a459-2f7919ba5dd4" VERSION="1.0" TYPE="ext4" USAGE="filesystem" PART_ENTRY_SCHEME="gpt" PART_ENTRY_NAME="primary" PART_ENTRY_UUID="259f0f4b-eb1e-4c34-a03d-65d04875f10c" PART_ENTRY_TYPE="ebd0a0a2-b9e5-4433-87c0-68b6b72699c7" PART_ENTRY_NUMBER="2" PART_ENTRY_OFFSET="30720" PART_ENTRY_SIZE="23435786240" PART_ENTRY_DISK="8:80"


builtin blkid sees two different superblocks and cannot decide

root at vla2-4101:~# udevadm test-builtin blkid /class/block/sdf2
calling: test-builtin
=== trie on-disk ===
tool version:          229
file size:         6841781 bytes
header size             80 bytes
strings            1755245 bytes
nodes              5086456 bytes
Load module index
Network interface NamePolicy= disabled on kernel command line, ignoring.
timestamp of '/etc/systemd/network' changed
timestamp of '/lib/systemd/network' changed
Parsed configuration file /lib/systemd/network/99-default.link
Created link configuration context.
probe /dev/sdf2 raid offset=0
Unload module index
Unloaded link configuration context.


root at vla2-4101:~# apt-cache policy udev
udev:
  Installed: 229-4ubuntu21.17
  Candidate: 229-4ubuntu21.17

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: xenial

** Tags added: xenial

** Summary changed:

- udev cannot identify fs uuid by builtin blkid (fixed in upstream)
+ [xenial] udev cannot identify fs uuid by builtin blkid (fixed in upstream)

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https://bugs.launchpad.net/bugs/1820874

Title:
  [xenial] udev cannot identify fs uuid by builtin blkid (fixed in
  upstream)

Status in systemd package in Ubuntu:
  New

Bug description:
  see upstream bug https://github.com/systemd/systemd/issues/6110

  fix
  https://github.com/poettering/systemd/commit/e2c48187ccb9668dab9f025c9c4228e97927179f

  udev calls libblkid with flag BLKID_SUBLKS_BADCSUM to see all superblocks but
  data in filesystem could be detected as broken superblock of other filesystem:

  root at vla2-4101:~# wipefs -n /dev/sdf2 
  offset               type
  ----------------------------------------------------------------
  0xae9c36ff006        nilfs2   [filesystem]
                       LABEL:  9-627f5c82-a8f363c9-a716ffb1)	ea9a210be67212ac	ffff0ae104ca29ef	
  2019-02-14 05:
                       UUID:  2c205265-6164-5365-7373-696f6e49643a

  0x438                ext4   [filesystem]
                       LABEL: /yt/disk5
                       UUID:  778742b8-1ac6-45cf-a459-2f7919ba5dd4

  
  normal blkid is fine

  root at vla2-4101:~# blkid -p /dev/sdf2 
  /dev/sdf2: LABEL="/yt/disk5" UUID="778742b8-1ac6-45cf-a459-2f7919ba5dd4" VERSION="1.0" TYPE="ext4" USAGE="filesystem" PART_ENTRY_SCHEME="gpt" PART_ENTRY_NAME="primary" PART_ENTRY_UUID="259f0f4b-eb1e-4c34-a03d-65d04875f10c" PART_ENTRY_TYPE="ebd0a0a2-b9e5-4433-87c0-68b6b72699c7" PART_ENTRY_NUMBER="2" PART_ENTRY_OFFSET="30720" PART_ENTRY_SIZE="23435786240" PART_ENTRY_DISK="8:80"

  
  builtin blkid sees two different superblocks and cannot decide

  root at vla2-4101:~# udevadm test-builtin blkid /class/block/sdf2
  calling: test-builtin
  === trie on-disk ===
  tool version:          229
  file size:         6841781 bytes
  header size             80 bytes
  strings            1755245 bytes
  nodes              5086456 bytes
  Load module index
  Network interface NamePolicy= disabled on kernel command line, ignoring.
  timestamp of '/etc/systemd/network' changed
  timestamp of '/lib/systemd/network' changed
  Parsed configuration file /lib/systemd/network/99-default.link
  Created link configuration context.
  probe /dev/sdf2 raid offset=0
  Unload module index
  Unloaded link configuration context.

  
  root at vla2-4101:~# apt-cache policy udev
  udev:
    Installed: 229-4ubuntu21.17
    Candidate: 229-4ubuntu21.17

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