[Bug 1987573] [NEW] /home on btrfs subvolume shared with / stops boot; adding nofail to fstab fixes it

[Bill]

Public bug reported:

After performing `do-release-upgrade` from 20.04 to 22.04.01, the system
failed to boot with a message of:

Failed to mount /home
Dependency failed for Local File Systems.

It took some work to figure out, but adding "nofail" to the fstab line
allowed boot to proceed, and with that, the system appears to be working
without issue.

Both /boot and /home are mounted from subvolumes on the same btrfs
filesystem.  The working fstab is below:

# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
LABEL=Root              /                       btrfs   defaults,subvol=@ 0       1
LABEL=Root              /home                   btrfs   defaults,subvol=@home,nofail 0       2
LABEL=EscherBackup      /mnt/EscherBackup       btrfs   defaults        0       2
LABEL=PicassoBackup     /mnt/PicassoBackup      btrfs   defaults        0       2
LABEL=scratch           /mnt/scratch            btrfs   defaults        0       2
/dev/mapper/cryptswap1 none swap sw 0 0
/dev/mapper/cryptswap2 none swap sw 0 0

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: ubuntu-release-upgrader-core 1:22.04.13
ProcVersionSignature: Ubuntu 5.15.0-46.49-generic 5.15.39
Uname: Linux 5.15.0-46-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.1
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
Date: Wed Aug 24 20:16:42 2022
EcryptfsInUse: Yes
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to jammy on 2022-08-24 (0 days ago)
VarLogDistupgradeXorgFixuplog:
 INFO:root:/usr/bin/do-release-upgrade running
 INFO:root:No xorg.conf, exiting

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade jammy

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https://bugs.launchpad.net/bugs/1987573

Title:
  /home on btrfs subvolume shared with / stops boot; adding nofail to
  fstab fixes it

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  After performing `do-release-upgrade` from 20.04 to 22.04.01, the
  system failed to boot with a message of:

  Failed to mount /home
  Dependency failed for Local File Systems.

  It took some work to figure out, but adding "nofail" to the fstab line
  allowed boot to proceed, and with that, the system appears to be
  working without issue.

  Both /boot and /home are mounted from subvolumes on the same btrfs
  filesystem.  The working fstab is below:

  # /etc/fstab: static file system information.
  #
  # Use 'blkid' to print the universally unique identifier for a
  # device; this may be used with UUID= as a more robust way to name devices
  # that works even if disks are added and removed. See fstab(5).
  #
  # <file system> <mount point>   <type>  <options>       <dump>  <pass>
  LABEL=Root              /                       btrfs   defaults,subvol=@ 0       1
  LABEL=Root              /home                   btrfs   defaults,subvol=@home,nofail 0       2
  LABEL=EscherBackup      /mnt/EscherBackup       btrfs   defaults        0       2
  LABEL=PicassoBackup     /mnt/PicassoBackup      btrfs   defaults        0       2
  LABEL=scratch           /mnt/scratch            btrfs   defaults        0       2
  /dev/mapper/cryptswap1 none swap sw 0 0
  /dev/mapper/cryptswap2 none swap sw 0 0

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: ubuntu-release-upgrader-core 1:22.04.13
  ProcVersionSignature: Ubuntu 5.15.0-46.49-generic 5.15.39
  Uname: Linux 5.15.0-46-generic x86_64
  ApportVersion: 2.20.11-0ubuntu82.1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CrashDB: ubuntu
  Date: Wed Aug 24 20:16:42 2022
  EcryptfsInUse: Yes
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: Upgraded to jammy on 2022-08-24 (0 days ago)
  VarLogDistupgradeXorgFixuplog:
   INFO:root:/usr/bin/do-release-upgrade running
   INFO:root:No xorg.conf, exiting

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