[Bug 1966800] Re: systemd locks up due to incorrect handling of time zone changes

[Launchpad Bug Tracker]

This bug was fixed in the package systemd - 245.4-4ubuntu3.18

---------------
systemd (245.4-4ubuntu3.18) focal; urgency=medium

  [ Nick Rosbrook ]
  * core: make sure we don't get confused when setting TERM for a tty fd
    (LP: #1959475)
    File: debian/patches/lp1959475-core-make-sure-we-don-t-get-confused-when-setting-TERM-fo.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=b10c6853050dde26665caf3b15444d768d2bc498
  * shared/calendarspec: when mktime() moves us backwards, jump forward
    (LP: #1966800)
    File: debian/patches/lp1966800-shared-calendarspec-when-mktime-moves-us-backwards-jump-f.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=1f063541e44f6ff1a6904676d4264a2e49a09594
  * network: do not remove localhost address (LP: #1979951)
    File: debian/patches/lp1979951-network-do-not-remove-localhost-address.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=87f872b8c5451f353601fb606e7fd7a479217cef
  * units: remove the restart limit on the modprobe at .service (LP: #1982462)
    File: debian/patches/lp1982462-units-remove-the-restart-limit-on-the-modprobe-.service.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=68353ffaf3539e6a58ef62a8b50850f56eae29ea

  [ Mustafa Kemal Gilor ]
  * d/p/lp1978079-efi-pstore-not-cleared-on-boot.patch: pstore: Run after
    modules are loaded. Thanks to Alexander Graf <graf at amazon.com>.
    (LP: #1978079)
    Author: Mustafa Kemal Gilor
    File: debian/patches/lp1978079-efi-pstore-not-cleared-on-boot.patch
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=6e60756f2079d6408abdb967127a1d9b9a0eba8c

 -- Nick Rosbrook <nick.rosbrook at canonical.com>  Wed, 31 Aug 2022
11:27:33 -0400

** Changed in: systemd (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1966800

Title:
  systemd locks up due to incorrect handling of time zone changes

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Focal:
  Fix Released
Status in systemd package in Fedora:
  Unknown

Bug description:
  [Impact]

  This bug can cause systemd timers to lock up systems using the
  Europe/Dublin timezone if certain OnCalendar values are used. If the
  timer is enabled at boot, this bug prevents the system from booting.
  If the timer is started later, systemd becomes unresponsive.

  [Test Plan]

  * Create a systemd service and corresponding timer scheduled for 01:00
  on Sundays:

  $ cat /etc/systemd/system/lp-1966800-reproducer.timer
   [Unit]
   Description=LP 1966800 reproducer

   [Timer]
   OnCalendar=Sun *-*-* 01:00:00
   Persistent=true

   [Install]
   WantedBy=timers.target

   $ cat /etc/systemd/system/lp-1966800-reproducer.service
   [Service]
   ExecStart=/usr/bin/echo "LP 1966800 reproducer"

   $ systemctl daemon-reload

  * Set the date to 21 March, 2021 in the Europe/Dublin timezone (need
  to disable NTP first):

   $ timedatectl set-ntp false
   $ timedatectl set-time "2021-03-21"
   $ timedatectl set-timezone Europe/Dublin

  * Try to start the timer, and observe that systemd becomes
  unresponsive. This command will time out, as will `systemctl status`
  etc.

   $ systemctl start lp-1966800-reproducer.timer

  [Where problems could occur]

  The patch makes changes in the calendar spec code, which is used by
  systemd timers to determine the next time to trigger a timer. If this
  patch breaks something, it would be related to the triggering of
  systemd timers.

  [Original Description]

  Recently on systems in Ireland, systemd became unresponsive due the
  change from GMT to Irish Standard Time. This is due to Ireland being
  unique in having their standard time during the summer, unlike most
  regions.

  Related to: https://bugzilla.redhat.com/show_bug.cgi?id=1941335
  Fixed by: https://github.com/systemd/systemd-stable/commit/a8b66ca9af811148b67ee952ab32748f88b8bba3

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