Symptoms

Consider the following scenario:

  • You have a computer that is running Windows Server 2008 R2 or Windows 7.

  • You install the Hyper-V role on the computer.

  • You run some virtual machines on the computer.

  • You back up the whole computer when the virtual machines are running.

In this scenario, you receive the following Stop error message:


0x0000007E (parameter1, parameter2, parameter3, parameter4)
SYSTEM_THREAD_EXCEPTION_NOT_HANDLED

Notes

  • The parameters in this error message vary, depending on the configuration of the computer.

  • Not all "0x0000007E" Stop error messages are caused by this problem.

Additionally, the following event is logged in the system event log after this problem occurs:

Cause

This problem occurs because the Volume Shadow Copy driver (Volsnap.sys) tries to access a deleted snapshot object.

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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

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, contact 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:

http://support.microsoft.com/contactus/?ws=supportNote 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 with the Hyper-V role installed.

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 English (United States) 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 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 and for Windows 7" 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 name

File version

File size

Date

Time

Platform

Volsnap.sys

6.1.7600.20778

295,296

13-Aug-2010

05:19

x64

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

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 name

Amd64_volume.inf_31bf3856ad364e35_6.1.7600.20778_none_72431c6f2ed8c8c7.manifest

File version

Not Applicable

File size

2,087

Date (UTC)

13-Aug-2010

Time (UTC)

05:49

Platform

Not Applicable

File name

Package_1_for_kb2299380~31bf3856ad364e35~amd64~~6.1.1.0.mum

File version

Not Applicable

File size

1,848

Date (UTC)

13-Aug-2010

Time (UTC)

19:52

Platform

Not Applicable

File name

Package_2_for_kb2299380~31bf3856ad364e35~amd64~~6.1.1.0.mum

File version

Not Applicable

File size

1,848

Date (UTC)

13-Aug-2010

Time (UTC)

19:52

Platform

Not Applicable

File name

Package_3_for_kb2299380~31bf3856ad364e35~amd64~~6.1.1.0.mum

File version

Not Applicable

File size

1,847

Date (UTC)

13-Aug-2010

Time (UTC)

19:52

Platform

Not Applicable

File name

Package_for_kb2299380_rtm~31bf3856ad364e35~amd64~~6.1.1.0.mum

File version

Not Applicable

File size

2,213

Date (UTC)

13-Aug-2010

Time (UTC)

19:52

Platform

Not Applicable

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