[Bug 1858412] Autopkgtest regression report (systemd/229-4ubuntu21.28)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted systemd (229-4ubuntu21.28) for xenial have finished running.
The following regressions have been reported in tests triggered by the package:

udisks2/2.1.7-1ubuntu1 (amd64)
multipath-tools/0.5.0+git1.656f8865-5ubuntu2.5 (armhf)
nplan/0.32~16.04.7 (amd64)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/xenial/update_excuses.html#systemd

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/1858412

Title:
  systemd vacuuming does not work for remote journals

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Committed
Status in systemd source package in Bionic:
  Fix Committed
Status in systemd source package in Disco:
  Won't Fix
Status in systemd source package in Eoan:
  Fix Committed

Bug description:
  [impact]

  attempting to vacuum journals using -D with the 'root' (in journald
  terms) journal directory fails to perform any vacuuming.  This can
  lead to journal files continually increasing in size and filling up
  the filesystem.

  [test case]

  see original description below.

  [regession potential]

  this removes a check in the code when iterating journal directories
  during vacuuming, so any regression would likely occur during
  vacuuming, possibly causing failure to vacuum.

  [scope]

  this is fixed upstream by commit
  c488660e6edb3c1375ab62514a8df035c3d712bf which is included starting in
  version 244, so this is already included in Focal.  This is needed for
  Eoan, Bionic, and Xenial.

  [original description]

  systemd has an issue in regard to vacuuming remote journals:
  https://github.com/systemd/systemd/issues/2376 - this affects 18.04 as
  this version still has this problem.

  Steps to reproduce on "Description:     Ubuntu 18.04.3 LTS":

  root at 1:~# du -hs /var/log/journal/remote/
  8.6G	/var/log/journal/remote/
  root at 1:~# journalctl -D /var/log/journal/remote --vacuum-size=100M
  root at 1:~# du -hs /var/log/journal/remote/
  8.6G	/var/log/journal/remote/

  Would it be possible to backport this trivial patch
  https://github.com/systemd/systemd/pull/13924 into 18.04?

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