[Bug 1940514] Re: It will prompt "Failed to unmount /oldroot" when shutdown or reboot

[Bin Li]

Verified on 22.04, this issue is fixed.
And on 20.04, I installed finalrd 9 and plymouth 0.9.5, this issue is also gone.

Here is the patch for finalrd, but for plymouth, there are so many
changes from 0.9.4, so I gave up to find the patches, let's fix this
issue on 22.04.

diff --git a/finalrd.service b/finalrd.service
index e67d177..b31705f 100644
--- a/finalrd.service
+++ b/finalrd.service
@@ -6,6 +6,7 @@ Documentation=man:finalrd(1)
 After=local-fs.target boot.mount boot.automount
 Wants=local-fs.target
 Conflicts=shutdown.target umount.target
+Before=shutdown.target
 DefaultDependencies=no

 [Service]
diff --git a/finalrd.sh b/finalrd.sh
index cffa94b..f623f8c 100755
--- a/finalrd.sh
+++ b/finalrd.sh
@@ -25,12 +25,11 @@ mount -o remount,exec /run
 # our shutdown sequence is to be controled by systemd-shutdown which
 # will unmount all the things, and run our hooks

-LD=`grep -Eow '/.*ld-.*.so' /proc/self/maps | head -1`
 for bin in /bin/sh /lib/systemd/systemd-shutdown
 do
     rm -f /run/finalrd-libs.conf
     touch /run/finalrd-libs.conf
- for lib in `$LD --list $bin | grep -Eow "/.* "`
+ for lib in `LD_TRACE_LOADED_OBJECTS=1 $bin | grep -Eow "/.* "`
     do
         if [ "$lib" = '=>' ]
         then

** No longer affects: mdadm

** Also affects: plymouth (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: oem-priority
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/1940514

Title:
  It will prompt "Failed to unmount /oldroot" when shutdown or reboot

Status in OEM Priority Project:
  Won't Fix
Status in finalrd package in Ubuntu:
  New
Status in plymouth package in Ubuntu:
  New

Bug description:
  Summary]
  [ThinkPad]It will prompt error message after shutdown or reboot.

  [Reproduce steps]
  1. Preload Ubuntu OS 20.04.2
  2. Boot and enter to the os
  3. Shutdown or reboot the machine, it wouldn't show below error by default.
  4. Then installed finalrd, and do reboot or shutdown.

  Expected Result:
   It will not prompt error message after shutdown or reboot.
  Actual result:
   It will prompt error message after shutdown or reboot as the attached 'the page after shutdown or reboot.jpg'.

   sd-umoun[2406]: Failed to unmount /oldroot: Device or resource busy
   sd-umoun[2407]: Failed to unmount /oldroot/dev/pts: Device or resource busy
   sd-umoun[2408]: Failed to unmount /oldroot/dev: Device or resource busy
   shutdown[1]: Failed to finalize  file systems, ignoring

   We met this issue on several OEM projects, such as
  ThinkPad-P17-Gen-1, ThinkPad X13.

  [Additional information]
  Platform: ThinkPad X1 Titanium Gen1, ThinkPad X13, ThinkPad P17
  systemd:245.4-4ubuntu3.11
  finalrd: 6~ubuntu20.04.1

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