[CentOS-virt] Xen C6 kernel 4.9.13 and testing 4.9.15 only reboots.

Updating my CentOS 6.8 Xen server with new 4.9.13 kernel yields a kernel
boot message of a few like "APIC ID MISMATCH" and the system reboots
immediately without any other bits of info. This is on a Dell R710 with
64GB RAM and 2x 6-core Intel CPU's.
As an additional test, I installed and attempted to run the current
"testing" kernel of 4.9.16 with the exact same results.

Anyone have an idea? The 3.18.x series runs without issue of course.

Thanks

PJ
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