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The Vmwp.exe process on a Hyper-V host leaks memory in Windows 8 or Windows Server 2012


View products that this article applies to.

Symptoms

Consider the following scenario:
  • You run Windows 8 or Windows Server 2012 as a Hyper-V host.
  • You set up a Windows 7 guest virtual machine within the Hyper-V host.
  • You install a third-party management console on the Windows 7 guest virtual machine.

In this scenario, the memory heap for this virtual machine worker process (Vmwp.exe) on the Hyper-V host leaks memory and may cause system instability.

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Cause

This problem occurs because the read buffer is not freed correctly.

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Resolution

Hotfix information

A supported hotfix is available from Microsoft Support. 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, go to the following Microsoft website: 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 have Windows 8 or Windows Server 2012 installed.

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any 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 8 and Windows Server 2012 file information and notes

Important Windows 8 and Windows Server 2012 hotfixes are included in the same packages. However, only "Windows 8" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 8" 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, milestone (RTM,SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    VersionProductMilestoneService branch
    6.2.920 0.20xxxWindows 8 and Windows Server 2012RTMLDR
  • 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 8 and Windows Server 2012" 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 x86-based versions of Windows 8
File nameFile versionFile sizeDateTimePlatform
Vmrdvcore.dll6.2.9200.20866293,37630-Oct-201322:29x86
For all supported x64-based versions of Windows 8 and Windows Server 2012
File nameFile versionFile sizeDateTimePlatform
Vmrdvcore.dll6.2.9200.20866354,81630-Oct-201322:28x64

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Status

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

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Additional file information

Additional file information for Windows 8 and for Windows Server 2012

Additional files for all supported x86-based versions of Windows 8
File namePackage_1_for_kb2905600~31bf3856ad364e35~x86~~6.2.1.0.mum
File versionNot Applicable
File size1,851
Date (UTC)31-Oct-2013
Time (UTC)07:27
PlatformNot Applicable
File namePackage_2_for_kb2905600~31bf3856ad364e35~x86~~6.2.1.0.mum
File versionNot Applicable
File size1,841
Date (UTC)31-Oct-2013
Time (UTC)07:27
PlatformNot Applicable
File namePackage_for_kb2905600_rtm~31bf3856ad364e35~x86~~6.2.1.0.mum
File versionNot Applicable
File size1,980
Date (UTC)31-Oct-2013
Time (UTC)07:27
PlatformNot Applicable
File nameX86_80e89acad08c198f6fce2517ea3e642a_31bf3856ad364e35_6.2.9200.20866_none_20e42b6b7cfa1bbe.manifest
File versionNot Applicable
File size708
Date (UTC)31-Oct-2013
Time (UTC)07:27
PlatformNot Applicable
File nameX86_microsoft-hyper-v-integration-rdv-core_31bf3856ad364e35_6.2.9200.20866_none_54acebcfe4ea12a4.manifest
File versionNot Applicable
File size1,841
Date (UTC)31-Oct-2013
Time (UTC)00:18
PlatformNot Applicable
Additional files for all supported x64-based versions of Windows 8 and Windows Server 2012
File nameAmd64_a04924bedd96eab8502a36831986ba97_31bf3856ad364e35_6.2.9200.20866_none_b8760b48d31c5c7d.manifest
File versionNot Applicable
File size712
Date (UTC)31-Oct-2013
Time (UTC)07:27
PlatformNot Applicable
File nameAmd64_microsoft-hyper-v-integration-rdv-core_31bf3856ad364e35_6.2.9200.20866_none_b0cb87539d4783da.manifest
File versionNot Applicable
File size1,843
Date (UTC)31-Oct-2013
Time (UTC)02:34
PlatformNot Applicable
File namePackage_1_for_kb2905600~31bf3856ad364e35~amd64~~6.2.1.0.mum
File versionNot Applicable
File size1,861
Date (UTC)31-Oct-2013
Time (UTC)07:27
PlatformNot Applicable
File namePackage_2_for_kb2905600~31bf3856ad364e35~amd64~~6.2.1.0.mum
File versionNot Applicable
File size1,851
Date (UTC)31-Oct-2013
Time (UTC)07:27
PlatformNot Applicable
File namePackage_for_kb2905600_rtm~31bf3856ad364e35~amd64~~6.2.1.0.mum
File versionNot Applicable
File size1,992
Date (UTC)31-Oct-2013
Time (UTC)07:27
PlatformNot Applicable

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References

See the terminology Microsoft uses to describe software updates for more information.

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Keywords: kbbug, kbsurveynew, kbexpertiseinter, kbautohotfix, kbhotfixserver, kbqfe, kb, kbfix

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Article Info
Article ID : 2905600
Revision : 1
Created on : 1/7/2017
Published on : 12/12/2013
Exists online : False
Views : 212