[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 version of this is NOT ready yet, a second run produced a
CRASH at startup on UC16 with the updated systemd.

** Patch removed: "debdiff with a port of the fix in PR#8803 for xenial"
   https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1819728/+attachment/5245665/+files/fix-systemctl-race-8803.debdiff

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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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