This clock jump by 2999 seconds also happened here, so per:
http://old-list-archives.xen.org/archives/html/xen-devel/2011-02/msg01557.html
we switched to clocksource=pit in /etc/default/grub's $GRUB_CMDLINE_XEN on
the dom0. This seemed to have avoided the problem, but since then, the clock
jumps started happening like this:
Dec 21 19:42:23 dom0machine kernel: [6034768.658836] Clocksource tsc unstable
(delta = -811538856601 ns)
In addition, now I checked what the said machine thinks is its clocksource:
% cat /sys/devices/system/clocksource/clocksource0/current_clocksource
/sys/devices/system/clocksource/clocksource0/available_clocksource
xen
xen
So there's neither pit nor tsc in the available list :)
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