Host has 160 cpus
When running 'virsh cpu-stats' cpu 140 output
cpu_time 0.000000000 seconds
vcpu_time 0.000000000 seconds
cpu_time 27.394963770 seconds
vcpu_time 27.394658147 seconds
The first two outputs are what's strange. This reproduced three times, always for cpu140, but, sigh, now I can't reproduce it...
Unfortunately we weren't able to either reproduce that or find any possibility for it to happen through code inspection (unless somebody is rewriting our memory, of course). I have to close this for now as there are insufficient data for us to continue. At least we have a bug to track that it already happened and if this happens again this may be reopened and we are more likely to know where to begin.
Don't hesitate to reopen this bug in case it is reproducible again.