Package: systemd-timesyncd Version: 259.7-3gl1+bp2150
To whom it may concern, We experienced a significant system clock issue on several Debian virtual machines using systemd-timesyncd. The incident occurred between 2026-10-08 02:26:51 CEST and 2026-10-08 04:42:53 CEST, corresponding to 2026-10-08 00:26:51 UTC and 2026-10-08 02:42:53 UTC. Environment * Operating system: Debian 14(forky) * Virtualization: QEMU/KVM managed by libvirt * Clock source: kvm-clock * NTP client: systemd-timesyncd Observed behavior The affected virtual machines experienced an apparent forward clock jump of approximately 33 days. The machines then operated with the incorrect future date for approximately two hours and sixteen minutes. Afterward, systemd-timesyncd corrected the clock backward by exactly: -2851200 seconds This is equal to: -33 days Our clock-jump monitor reported: JUMP -2851200.0s at epoch 1791427373; ntp_synced=yes The correction occurred at approximately: 2026-10-08 02:42:53 UTC 2026-10-08 04:42:53 CEST Journal evidence The journal contains the following messages: Nov 10 00:26:34 systemd-resolvedClock change detected. Flushing caches. Oct 08 02:42:36 systemd-resolvedClock change detected. Flushing caches. Oct 08 02:42:36 systemd-journaldTime jumped backwards, rotating. NTP config All of the machines which were affected were synced against the following IP 152.53.239.75 Could you please check if there was everything ok with the NTP server? Thank you in advance Kind regards Krisztián Körmöndi DEUTSCHE TELEKOM AG Deutsche Telekom Systems Solutions Slovakia s.r.o. Enterprise Application Services- Open Sovereign Cloud Krisztián Körmöndi DevOps Engineer Moldavska cesta 8B, 04001 Kosice; Slovakia Web: www.deutschetelekomitsolutions.sk<https://www.deutschetelekomitsolutions.sk/> LIFE IS FOR SHARING. The compulsory statement can be found here<https://www.deutschetelekomitsolutions.sk/en/compulsory-statement> [Image] Enabling more sustainability and participation. Further information on the Telekom Sustainability Initiative: https://wecare.telekom.com/en/label/
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