After the upgrade to kernel 4.4.49-16-default regular mce errors are produced:

[ 1400.849775] mce: [Hardware Error]: Machine check events logged
[ 1400.849780] mce: [Hardware Error]: CPU 0: Machine Check: 0 Bank 128:
0000000088040002
[ 1400.849780] mce: [Hardware Error]: TSC 374cb16baf2 mce: 
[ 1400.849781] mce: [Hardware Error]: PROCESSOR 0:306a9 TIME 1488756476 SOCKET
0 APIC 0 microcode 1c
[ 1400.849781] mce: [Hardware Error]: CPU 1: Machine Check: 0 Bank 128:
0000000088040002
[ 1400.849782] mce: [Hardware Error]: TSC 374cb16baf8 mce: 
[ 1400.849782] mce: [Hardware Error]: PROCESSOR 0:306a9 TIME 1488756476 SOCKET
0 APIC 1 microcode 1c


This is when I upgraded the kernel:
gerald6:~ # rpm -qa --last | grep kernel-default-4.4.49-16.1.x86_64
kernel-default-4.4.49-16.1.x86_64             Mon Feb 27 11:49:26 2017

The mce errors started after the upgrade/reboot:
gerald6:/var/log # for i in messages-2017* ; do xzcat $i | grep mce | grep
"Bank 128"; done | head -1
2017-02-28T13:50:11.991614+10:00 gerald6 kernel: [   12.092760] mce: [Hardware
Error]: CPU 0: Machine Check: 0 Bank 128: 0000000088030003

Hardware:
Lenovo W530
Intel(R) Core(TM) i7-3740QM CPU @ 2.70GHz
16GB RAM

There are other reports of that issue here:
https://forums.opensuse.org/showthread.php/523358-hardware-fault-Kernel-error-4-4-49-16-every-few-minutes