Looks like this still needs to be worked out upstream.

** Bug watch added: github.com/systemd/systemd/issues #10179
   https://github.com/systemd/systemd/issues/10179

** Also affects: systemd via
   https://github.com/systemd/systemd/issues/10179
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1838329

Title:
  Cryptswap periodically fails to mount at boot due to missing a udev
  notification

Status in systemd:
  Unknown
Status in systemd package in Ubuntu:
  New

Bug description:
  On some systems, cryptsetup-based encrypted swap partitions cause
  systemd to get stuck at boot. This is a timing-sensitive Heisenbug, so
  the rate of occurrence varies from one system to another. Some
  hardware will not experience the issue at all, others will only
  occasionally experience the issue, and then there are the unlucky who
  are unable to boot at all, no matter how many times they restart.

  The workaround is for the cryptsetup-generator to generate cryptswap
  service entries that call `udevadm trigger` after `mkswap`. This will
  ensure that the udev event is triggered, so that systemd is notified
  that the encrypt swap partition is ready to activate. This patch has
  already been submitted upstream to systemd, but it was not accepted
  because it is a workaround for the side effect of systemd not seeing
  the udev event upon creating the swap partition.

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