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

[Ubuntu Foundations Team Bug Bot]

** Tags added: patch

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

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:
  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".

  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.

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