I took a bit of time to try to reproduce, without success. Here were my
steps:

$ lxc launch ubuntu:jammy --vm jammy
Launching jammy
$ lxc exec jammy bash
root@jammy:~# apt update && apt install -y atop
...
root@jammy:~# systemctl stop systemd-timesyncd
root@jammy:~# timedatectl set-timezone Europe/Dublin
root@jammy:~# timedatectl set-time "2024-03-30 23:59:50"

In another terminal before messing with the time:
$ lxc exec jammy htop

I did not see init eating 100% CPU, the machine remained mostly idle.

Could you please provide more details on how to reproduce the bug?

** Changed in: systemd (Ubuntu Jammy)
       Status: New => Incomplete

** Changed in: systemd (Ubuntu)
       Status: Confirmed => Invalid

** Tags removed: rls-jj-incoming

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https://bugs.launchpad.net/bugs/2060082

Title:
  Dublin timezone cause systemd cpu high

Status in systemd package in Ubuntu:
  Invalid
Status in systemd source package in Jammy:
  Incomplete

Bug description:
  Systemd version(249) in Jammy Jellyfish is too old, When using the
  Dublin time zone for daylight saving time switching,the CPU usage will
  suddenly increase to 100% starting from 2024-03-31 00:00:00 and last
  for 1 hour, but return to normal at 2024-03-31 02:00:00. plz backport
  the bugfix to v249 or update 255 version in Jammy Jellyfish to fix it.
  thank you.

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