"0x20001" Stop error when you start a Linux VM in Windows Server 2008 R2 SP1

Applies to: Windows Server 2008 R2 Service Pack 1Windows Server 2008 R2 StandardWindows Server 2008 R2 Enterprise More

Not sure if this is the right fix? We've added this issue to our memory dump diagnostic which can confirm.

Symptoms


Consider the following scenario:
  • You install the Hyper-V role on a computer that is running Windows Server 2008 R2 Service Pack 1 (SP1) and that has Intel Xeon processors.
  • You create a virtual machine (VM) that is running version 5 or 6 of the Red Hat Enterprise Linux (RHEL) operating system.
  • You select the Migrate to a physical computer with a different processor version check box under the Processor configuration for the VM.
  • You start the VM.
In this scenario, the computer crashes. Additionally, you receive a Stop error message that resembles the following:

STOP: 0x20001 (parameter1 , parameter2 , parameter3 , parameter4 )
HYPERVISOR_ERROR
Notes
  • The parameters in this Stop error message vary, depending on the configuration of the computer.
  • Not all "0x20001" Stop errors are caused by this issue.

Cause


During early initialization of a Linux VM, the hypervisor fails while it runs an XRSTOR instruction. The hypervisor may fail after the virtual processor is created or when a virtual processor is scheduled on a particular logical processor if no other virtual processor runs before the scheduled virtual processor.

This issue is not specific to Linux VMs and may occur on Windows VMs. However, the 0x20001 Stop error is not generated when you start the Windows VM. This error is instead randomly generated after several days, weeks, or months of uptime.

Resolution


Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running Windows Server 2008 R2 Service Pack 1 (SP1). Additionally, the Hyper-V role must be installed.

For more information about how to obtain a Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
    VersionProductSR_LevelService branch
    6.1.760
    1.
    21xxx
    Windows Server 2008 R2SP1LDR
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x64-based versions of Windows Server 2008 R2
File nameFile versionFile sizeDateTimePlatform
Hvax64.exe6.1.7601.21726614,91212-May-201102:27x64
Hvboot.sys6.1.7601.21726118,14412-May-201105:20x64
Hvix64.exe6.1.7601.21726652,80012-May-201102:27x64

Workaround


To work around this issue, click to clear the Migrate to a physical computer with a different processor version check box under the Processor configuration for the VM.

Status


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information


For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

Additional file information

Additional file information for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows Server 2008 R2
File nameAmd64_0b4aaa25b4c7c95b915efe835695e509_31bf3856ad364e35_6.1.7601.21726_none_2b3a5ece1482c7d3.manifest
File versionNot applicable
File size710
Date (UTC)12-May-2011
Time (UTC)08:31
PlatformNot applicable
File nameAmd64_microsoft-hyper-v-drivers-hypervisor_31bf3856ad364e35_6.1.7601.21726_none_8ef828299548bd88.manifest
File versionNot applicable
File size4,163
Date (UTC)12-May-2011
Time (UTC)07:10
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,462
Date (UTC)12-May-2011
Time (UTC)08:31
PlatformNot applicable