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