I'm seeing these MCE messages too. 

My hardware is i7 4790K on a Gigabyte Z97X Gaming GT motherboard.

I run a mixture of Linux and Windows (client and server editions) guests. Hipervisor is kvm. I'm seeing these MCE messages since I virtualized a Windows Server 2008 R2 SP1. Neither Windows XP nor Windows 8.1 guests showed any messages.

For a few minutes I was worried my hardware was faulty, but this bug reports somewhat gives me hope the hardware is OK.

Pasted below is my /var/log/mcelog 



mcelog: failed to prefill DIMM database from DMI data
Hardware event. This is not a software error.
MCE 0
CPU 0 BANK 0 
TIME 1440943174 Sun Aug 30 10:59:34 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 0 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 1
CPU 0 BANK 0 
TIME 1441015741 Mon Aug 31 07:09:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 0 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 0
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 1
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 2
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 3
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 4
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 5
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 6
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 7
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 8
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 9
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 10
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 11
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 12
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 13
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 0
CPU 2 BANK 0 
TIME 1441064341 Mon Aug 31 20:39:01 2015
MCG status:
MCi status:
Corrected error
Error enabled
MCA: Internal parity error
STATUS 90000040000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60
Hardware event. This is not a software error.
MCE 0
CPU 2 BANK 0 
TIME 1441064371 Mon Aug 31 20:39:31 2015
MCG status:
MCi status:
Error overflow
Corrected error
Error enabled
MCA: Internal parity error
STATUS d0000200000f0005 MCGSTATUS 0
MCGCAP c09 APICID 4 SOCKETID 0 
CPUID Vendor Intel Family 6 Model 60