Bug#1033548: 02:00 timers dont run in DST transition night

[Marc Haber]

Package: systemd
Version: 252.6-1
Severity: minor

Hi,

aide-common ships the following timer:

[Unit]
Description=Daily AIDE check

[Timer]
OnCalendar=*-*-* 02:00:00
RandomizedDelaySec=2h
Persistent=true

[Install]
WantedBy=timers.target

This didn't run in DST transition night. I think this might be caused by
the clock jumping from 01:59 to 03:00, with 02:00 not existing.

Is there a notation to have a systemd timer run even if the exact time
the timer is supposed to run doesn't happen? I guess this might also be
the case in case of a grossly misticking clock and a timesync daemon
stepping the time, for example, from 01:59:50 to 02:02:00?

Or would be probably be a better idea to trigger a timer if systemd
finds the trigger time in the past without the timer having been
triggered?

Not running at all came as kind of surprise for me.

I might be holding things wrong but I'd like your opinion.

Greetings
Marc


-- Package-specific info:

-- System Information:
Debian Release: 12.0
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'unstable'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.2.8-zgsrv20080 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8), LANGUAGE=en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages systemd depends on:
ii  libacl1            2.3.1-3
ii  libaudit1          1:3.0.9-1
ii  libblkid1          2.38.1-5+b1
ii  libc6              2.36-8
ii  libcap2            1:2.66-3
ii  libcryptsetup12    2:2.6.1-3
ii  libfdisk1          2.38.1-5+b1
ii  libgcrypt20        1.10.1-3
ii  libkmod2           30+20221128-1
ii  liblz4-1           1.9.4-1
ii  liblzma5           5.4.1-0.2
ii  libmount1          2.38.1-5+b1
ii  libp11-kit0        0.24.1-2
ii  libseccomp2        2.5.4-1+b3
ii  libselinux1        3.4-1+b5
ii  libssl3            3.0.8-1
ii  libsystemd-shared  252.6-1
ii  libsystemd0        252.6-1
ii  libzstd1           1.5.4+dfsg2-5
ii  mount              2.38.1-5+b1

Versions of packages systemd recommends:
ii  dbus [default-dbus-system-bus]  1.14.6-1
ii  ntpsec [time-daemon]            1.2.2+dfsg1-1

Versions of packages systemd suggests:
ii  libfido2-1             1.12.0-2+b1
pn  libqrencode4           <none>
pn  libtss2-esys-3.0.2-0   <none>
pn  libtss2-mu0            <none>
pn  libtss2-rc0            <none>
pn  polkitd | policykit-1  <none>
pn  systemd-boot           <none>
pn  systemd-container      <none>
pn  systemd-homed          <none>
ii  systemd-resolved       252.6-1
pn  systemd-userdbd        <none>

Versions of packages systemd is related to:
pn  dbus-user-session  <none>
pn  dracut             <none>
ii  initramfs-tools    0.142
pn  libnss-systemd     <none>
ii  libpam-systemd     252.6-1
ii  udev               252.6-1

-- no debconf information