[Bug 1795764] Re: systemd: core: Fix edge case when processing /proc/self/mountinfo

[Eric Desrochers]

I think the "|| true;" is a good test to validate but I might have to
find something more viable to SRU.

I'll see how upstream populate MOUNT(u)->just_mounted, and try to mimic
that as well instead of forcing "true" implicitly.

This is where I'm at the moment.

Stay tuned.

- Eric

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https://bugs.launchpad.net/bugs/1795764

Title:
  systemd: core: Fix edge case when processing /proc/self/mountinfo

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Confirmed

Bug description:
  From the PR:
  Currently, if there are two /proc/self/mountinfo entries with the same
  mount point path, the mount setup flags computed for the second of
  these two entries will overwrite the mount setup flags computed for
  the first of these two entries. This is the root cause of issue #7798.
  This patch changes mount_setup_existing_unit to prevent the
  just_mounted mount setup flag from being overwritten if it is set to
  true. This will allow all mount units created from /proc/self/mountinfo
  entries to be initialized properly.

  One line fix in https://github.com/systemd/systemd/pull/7811/files

  Referenced issue: https://github.com/systemd/systemd/issues/7798

  Related kubernetes issue:
  https://github.com/kubernetes/kubernetes/issues/57345

  systemd v237 has this fix, but we'd like to have it fixed in 16.04.

  [Other Informations]

  It only affect systemd for Xenial, later release already has the fix:

  $ git describe --contains 65d36b495
  v237~140

  ==>  systemd | 229-4ubuntu21.4  | xenial-updates          
       systemd | 237-3ubuntu10.3  | bionic-updates  
       systemd | 239-7ubuntu9     | cosmic

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