On Mon, May 05, 2014 at 08:26:04PM +0200, Marcin Gibuła wrote: > >>is it possible to have kvmclock jumping forward? > >> > >>Because I've reproducible case when at about 1 per 20 vm restores, VM > >>freezes for couple of hours and then resumes with date few hundreds years > >>ahead. Happens only with kvmclock. > >> > >>And this patch seems to fix very similar issue so maybe it's all the same > >>bug. > > > >I'm fairly sure it is the exact same bug. Jumping backward is like jumping > >forward by a biiiiig amount :) > > Hi, > > I've tested your path on my test VM... don't know if it's pure luck > or not, but it didn't hang with over 70 restores. > > The message "KVM Clock migrated backwards, using later time" fires > every time, but VM is healthy after resume.
What is the host clocksource? (cat /sys/devices/system/clocksource/clocksource0/current_clocksource). And kernel version?
