Server 2012R2, VMware 5.0.X Blue screen/BSOD, Event 41, CPUID Mask Flag

by butsch 19. January 2015 19:43



You have a blue screen and Event 41 under ESX 5.0.0 when you run Server 2012 R2 because you're VMWARE Team it should run

(You ask > why does it not show up under Supported OS then. They say > VMWARE says it's supported it only shows it's not)

Well not in a validated environment for sure!

Event 41

The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.

The computer has rebooted from a bugcheck. The bugcheck was: 0x00000109 (0xa3a01f59c38d1747, 0xb3b72be0160d1792, 0x00000000c0000103, 0x0000000000000007).

A dump was saved in: C:\Windows\MEMORY.DMP. Report Id: 011915-11203-01.


Download NITSOFT BLUESCREEN and install on the Server (Just unpack and run exe) to analyses the memory dump if you

Want to be sure.


Two ways to solve this:

  1. UPGRADE VMware 5.0.0 to 5.0.1 U-something and all behind > Project 2 days
  2. Change a CPUID Mask Flag

Here is what to change if you're HAVE AMD Servers:

  1. Shutdown Server
  2. Edit Settings
  3. Options
  4. Advanced


Before change on AMD (Attention different settings for AMD and INTEL CPU)





Screenshot: This is what to change for AMD

Vmware KB 2060019

To work around this issue, manually create a CPUID mask for the affected virtual machines:


To manually create a CPUID mask for the affected virtual machines:

  • Power down the virtual machine.
  • Right-click the virtual machine and click Edit Settings.
  • Click the Options tab.
  • Select CPUID Mask under Advanced.
  • Click Advanced.
    • For Intel:
      • Under the Register column, locate the edx register under Level 80000001.
      • Paste this into the value field:


        For example,
        cpuid.80000001.edx = ----:0---:----:----:----:----:----:----


    • For AMD:
      • Select the AMD Override tab.
      • Change cpuid.80000001.edx.amd = -----------H-------------------- to
        cpuid.80000001.edx.amd = ----0---------------------------
  • Click OK to close the virtual machine properties.

Remark 12.02.2015

Under ESX 5.5.0 2068190 BOTH the INTEL and AMD Server show the FLAG AS as


without the : (Doublodots). As exmaple on an INTEL XEON X5675, 3.07HGz CPU

On a ESX Server where we could select "Server 2012 X64" as new machine.




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