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

[Bill]

The `journalctl -xb` output is attached.  The error is noted at time
"Aug 29 11:12:19".  I had to press Ctrl-D at the right moment during
boot so that I could get this output.  For clarity, I removed the
"nofail" to get this error again, and it is reproducible by
adding/removing "nofail".

** Attachment added: "journalctl.txt"
   https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1987573/+attachment/5612388/+files/journalctl.txt

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

Status in systemd package in Ubuntu:
  Incomplete

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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