[Bug 2060082] Re: Dublin timezone cause systemd cpu high

[Ivan Vučica]

Encountered last night (2025-03-30) on Debian 12 on systemd package
252.36-1~deb12u1. 100% CPU usage by /sbin/init stopped either by
stopping .timer units manually or by waiting until clock changed
00:59:59Z -> 02:00:00+0100.

This is evidenced by one of the multiple affected machines logs showing
.timer-covered .service units stopped restarting exactly at that time.

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Title:
  Dublin timezone cause systemd cpu high

Status in systemd package in Ubuntu:
  Confirmed

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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