[Qemu-devel] [Bug 1307225] Re: Running a virtual machine on a Haswell system produces machine check events

[cvbkf]

I can confirm this.

Using qemu-kvm for three virtual machines on Ubuntu 14.04 LTS using a
Intel i7-4770 Haswell based server.

dmesg: 
[63429.847437] mce: [Hardware Error]: Machine check events logged
[65996.795630] mce: [Hardware Error]: Machine check events logged

mcelog:
Hardware event. This is not a software error.
MCE 0
CPU 2 BANK 0
TIME 1406265172 Fri Jul 25 07:12:52 2014
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

It's the same error everytime, only APICID and CPU numbers are different. 
The mce errors did not happen until i migrated the virtual machines from 
another system, the haswell-server was up for three days without any incidents, 
now, while running qemu-kvm there is a mce error every 6-12 hours. 
After the first errors, i called the support of my server provider, they first 
exchanged RAM, upgraded BIOS... 
Then, they replaced the whole server, only swapping my harddisks to the new 
one. But even that didn't help, i still got MCE errors. The harddisks where 
replaced too, one at a time (to resync raid). Now, i have a completely swapped 
hardware, but the MCE errors are still popping up.

system information attached

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1307225

Title:
  Running a virtual machine on a Haswell system produces machine check
  events

Status in QEMU:
  New

Bug description:
  I'm running a virtual Windows SBS 2003 installation on a Xeon E3
  Haswell system running Gentoo Linux. First, I used Qemu 1.5.3 (the
  latest stable version on Gentoo). I got a lot of machine check events
  ("mce: [Hardware Error]: Machine check events logged") in dmesg that
  always looked like (using mcelog):

  Hardware event. This is not a software error.
  MCE 0
  CPU 3 BANK 0
  TIME 1397455091 Mon Apr 14 07:58:11 2014
  MCG status:
  MCi status:
  Corrected error
  Error enabled
  MCA: Internal parity error
  STATUS 90000040000f0005 MCGSTATUS 0
  MCGCAP c09 APICID 6 SOCKETID 0
  CPUID Vendor Intel Family 6 Model 60

  I found this discussion on the vmware community:
  https://communities.vmware.com/thread/452344

  It seems that this is (at least partly) caused by the Qemu machine. I
  switched to Qemu 1.7.0, the first version to use "pc-i440fx-1.7". With
  this version, the errors almost disappeared, but from time to time, I
  still get machine check events. Anyways, they so not seem to affect
  neither the vm, nor the host.

  The Haswell machine has been set up and running for several days
  without a single error message. They only appear when the VM is
  running. so I think this is actually some problem with the Haswell
  architecture (and not a real hardware error).

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1307225/+subscriptions