[Bug 1819728] Re: Please backport "fix race between daemon-reload and other commands #8803" to 16.04 (for UC16) and 18.04 (for UC18)

[Michael Vogt]

The xenial build of the updated systemd was tested using a full spread
run with no regressions and a new test was added in
https://github.com/snapcore/snapd/pull/6595 to test that the regression
is fixed

This test shows that core/edge is fixed but core/beta which does not yet
has the fix is hanging (as expected).

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Title:
  Please backport "fix race between daemon-reload and other commands
  #8803" to 16.04 (for UC16) and 18.04 (for UC18)

Status in systemd package in Ubuntu:
  New
Status in systemd source package in Xenial:
  New
Status in systemd source package in Bionic:
  New

Bug description:
  [Impact]
  On Ubuntu Core we recently hit the a race in daemon-reload and systemctl twice. This race is fixed in systemd upstream: "fix race between daemon-reload and other commands #8803".

  [TEST CASE]
  To reproduce its enough to run:

  for i in $(seq 50); do
    systemctl daemon-reload &
    systemctl start ssh &
  done

  This will result in "systemctl start ssh" hanging in ppoll. With the
  patch applied the hangs go away.

  [REGRESSION POTENTIAL]
  Low, this change is already in the systemd upstream and in use cosmic and later.

  The upstream fix is https://github.com/systemd/systemd/pull/8803

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