[Bug 1788048] Re: systemd journald failed unmounting var

[Dan Streetman]

It seems like the upstream commits to fix this may have made journalctl --flush flaky and/or introduced other regressions:
https://github.com/systemd/systemd/pull/12230#issuecomment-491593897

Additionally, the fix upstream is not a trivial backport and has the potential to cause even more problems for SRU releases.
https://github.com/systemd/systemd/pull/12230/commits

As this bug is rather limited in scope (only systems with /var or
/var/log mounted separately from /) and the only potential issue I see
is /var isn't cleanly unmounted, it seems like backporting the upstream
fix may bring more problems than it solves.

Possibly there is some simpler workaround we could add for SRU releases,
but it would take some more investigation.  I'm removing myself as bug
owner here, so possibly someone else can investigate, in case I'm not
able to get back to this.

** Tags removed: ddstreet-next

** Changed in: systemd (Ubuntu Bionic)
       Status: In Progress => New

** Changed in: systemd (Ubuntu Cosmic)
       Status: In Progress => New

** Changed in: systemd (Ubuntu Disco)
       Status: In Progress => New

** Changed in: systemd (Ubuntu Eoan)
       Status: In Progress => New

** Changed in: systemd (Ubuntu Bionic)
     Assignee: Dan Streetman (ddstreet) => (unassigned)

** Changed in: systemd (Ubuntu Cosmic)
     Assignee: Dan Streetman (ddstreet) => (unassigned)

** Changed in: systemd (Ubuntu Disco)
     Assignee: Dan Streetman (ddstreet) => (unassigned)

** Changed in: systemd (Ubuntu Eoan)
     Assignee: Dan Streetman (ddstreet) => (unassigned)

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https://bugs.launchpad.net/bugs/1788048

Title:
  systemd journald failed unmounting var

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  New
Status in systemd source package in Bionic:
  New
Status in systemd source package in Cosmic:
  New
Status in systemd source package in Disco:
  New
Status in systemd source package in Eoan:
  New

Bug description:
  [impact]

  on a system with /var and/or /var/log mounted separately from /,
  shutdown can't unmount /var (or /var/log) cleanly because systemd-
  journald is using it.

  [test case]

  install a system with /var mounted separately from /

  shutdown, and notice:

  [FAILED] Failed unmounting /var.

  [regression potential]

  TBD

  [other info]

  original description:

  --

  When the system is shut down or restarted the systemd-journal does not
  disassemble the disks correctly.

  On this thread https://unix.stackexchange.com/questions/378678/why-
  do-i-get-the-error-failed-unmounting-var-during-shutdown

  I checked what editing /etc/systemd/journald.conf
  to change the Storage = line to Storage = volatile the problem is solved, but some of the logs on the shutdown are lost.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd 237-3ubuntu10.3
  ProcVersionSignature: Ubuntu 4.15.0-32.35-generic 4.15.18
  Uname: Linux 4.15.0-32-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Mon Aug 20 18:15:07 2018
  ExecutablePath: /lib/systemd/systemd-journald
  InstallationDate: Installed on 2018-08-20 (0 days ago)
  InstallationMedia: Ubuntu-Server 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  Lsusb:
   Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: innotek GmbH VirtualBox
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-32-generic root=UUID=65cb761b-4881-4031-9113-e6bb6a1437b4 ro
  SourcePackage: systemd
  SystemdDelta:
   [EXTENDED]   /lib/systemd/system/rc-local.service → /lib/systemd/system/rc-local.service.d/debian.conf
   [EXTENDED]   /lib/systemd/system/user at .service → /lib/systemd/system/user at .service.d/timeout.conf

   2 overridden configuration files found.
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.family: Virtual Machine
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH
  mtime.conffile..etc.systemd.journald.conf: 2018-08-20T18:00:58.586165

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