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<pre><div style="text-align: left; text-transform: none; font-size: 14pt; color: rgb(0, 0, 0);">Package: systemd-timesyncd
Version: 259.7-3gl1+bp2150</div></pre>
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<span style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0);">To whom it may concern,</span></p>
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<span style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0);">We experienced a significant system clock issue on several Debian virtual machines using
<code>systemd-timesyncd</code>.</span></p>
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<span style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0);">The incident occurred between
<b>2026-10-08 02:26:51 CEST and 2026-10-08 04:42:53 CEST</b>, corresponding to <b>
2026-10-08 00:26:51 UTC and 2026-10-08 02:42:53 UTC</b>.</span></p>
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<span style="font-family: "Segoe UI"; font-size: 18pt; color: rgb(0, 0, 0); line-height: 1.2;">Environment</span></h3>
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<div role="presentation"><span style="text-transform: none;">Operating system: Debian 14(forky)</span></div>
</li><li style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0); line-height: 20px; align-self: start;">
<span style="text-transform: none;" role="presentation">Virtualization: QEMU/KVM managed by libvirt</span></li><li style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0); line-height: 20px; align-self: start;">
<span style="text-transform: none;" role="presentation">Clock source: <code>kvm-clock</code></span></li><li style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0); line-height: 20px; align-self: start;">
<span style="text-transform: none;" role="presentation">NTP client: <code>systemd-timesyncd</code></span></li></ul>
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<span style="font-family: "Segoe UI"; font-size: 18pt; color: rgb(0, 0, 0); line-height: 1.2;">Observed behavior</span></h3>
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<span style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0);">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.</span></p>
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<span style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0);">Afterward,
<code>systemd-timesyncd</code> corrected the clock backward by exactly:</span></p>
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<span style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0);">-2851200 seconds</span></p>
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<span style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0);">This is equal to:</span></p>
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<span style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0);">-33 days</span></p>
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<span style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0);">Our clock-jump monitor reported:</span></p>
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JUMP -2851200.0s at epoch 1791427373; ntp_synced=yes</div>
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<span style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0);">The correction occurred at approximately:</span></p>
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2026-10-08 02:42:53 UTC</div>
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2026-10-08 04:42:53 CEST</div>
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<span style="font-family: "Segoe UI"; font-size: 18pt; color: rgb(0, 0, 0); line-height: 1.2;">Journal evidence</span></h3>
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<span style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0);">The journal contains the following messages:</span></p>
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<span style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0);">Nov 10 00:26:34 systemd-resolvedClock change detected. Flushing caches.</span></p>
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<span style="font-family: "Segoe UI"; font-size: 14pt; color: rgb(0, 0, 0);">Oct 08 02:42:36 systemd-resolvedClock change detected. Flushing caches.</span></p>
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Oct 08 02:42:36 systemd-journaldTime jumped backwards, rotating.</div>
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<span style="font-family: "Segoe UI"; font-size: 18pt; color: rgb(0, 0, 0); line-height: 1.2;">NTP config </span></h3>
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<span style="font-family: "Segoe UI";">All of the machines which were affected were synced against the following IP </span><span style="font-family: Aptos; text-transform: none;">152.53.239.75</span></div>
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Could you please check if there was everything ok with the NTP server?</div>
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Thank you in advance</div>
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Kind regards</div>
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<b>Krisztián Körmöndi</b></div>
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<b>DEUTSCHE TELEKOM AG</b></div>
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Deutsche Telekom Systems Solutions Slovakia s.r.o.</div>
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Enterprise Application Services- Open Sovereign Cloud</div>
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Krisztián Körmöndi</div>
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DevOps Engineer</div>
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Moldavska cesta 8B, 04001 Kosice; Slovakia</div>
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