Package: linux-image-4.9.0-0.bpo.1-amd64-unsigned Version: 4.9.2-2~bpo8+1 Severity: important Tags: upstream Since using the linux-image-4.9.0-0.bpo.1-amd64 kernel, some of our Jessie systems running under HyperV virtualization show an enormous time divergence gradually building up over some hours (see attached graphs from our NTP monitoring). System time and NTP time converge to approx. 10 minutes every approx. 8 hours (though some machines diverge forwards and some backwards...). Especially jumping backwards in time can be critical for various applications. Additionally, Systemd prints "Time has been changed" to the syslog every 5 seconds, which is a little bit annoying. In upstream, there is a patch under development that drops in-kernel time adjustments and exposes the TimeSync messages as a PTP device for consumation by an NTP client: https://lkml.org/lkml/2017/1/30/232. I don't know whether this classifies as some kind of brokenness on some hardware (e.g. HyperV 2016)... A possible workaround of course is to just disable Time Synchronisation in the Guest Additions setting in HyperV. Best regards, Moritz -- System Information: Debian Release: 8.7 APT prefers stable-updates APT policy: (700, 'stable-updates'), (700, 'stable'), (60, 'testing') Architecture: amd64 (x86_64) Kernel: Linux 3.16.0-4-amd64 (SMP w/8 CPU cores) Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system)
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