[vitaliyf]

This may or may not be related, but there is a Xen advisory embargoed until Thursday (see https://xenbits.xen.org/xsa/) and I am aware of at least one VM provider who scheduled emergency VM reboots across their entire fleet this week because the issue cannot be addressed through hot-patching.

[snom380]

I got around 10% of our Xen instances scheduled for reboot on Jan 4th, mostly long running instances. It's the first time I've seen that many instances scheduled at once.

[VectorLock]

Also got a large number of instances with scheduled reboot on Jan 4th in older AZs.