DNS Server service leaks memory when you perform Zone Transfer operations in Windows Server 2008 R2

Applies to: Windows Server 2008 R2 DatacenterWindows Server 2008 R2 EnterpriseWindows Server 2008 R2 Foundation More

Symptoms


Consider the following scenario:
  • You install the DNS Server role on a computer that is running Windows Server 2008 R2.
  • You perform some Zone Transfer operations for lots of zones on the DNS server.

In this scenario, memory usage of the DNS Server service keeps increasing. After a while, the available memory is exhausted on the computer. Therefore, all running applications and services on the computer stop responding.

Cause


This issue occurs because of a memory leak. When the DNS Server service does not successfully add a zone transfer response package to the DNS secondary queue, the service does not release allocated memory for the packet. Therefore, the memory leak occurs.

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: 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.
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.

Registry information

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

Restart requirement

To avoid a restart of the computer, you have to stop the DNS Server service before you install this hotfix package.

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 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
    6.1.760
    0.20xxx
    Windows Server 2008 R2RTMLDR
  • 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
Cache.dnsNot applicable3,19810-Jun-200920:31Not applicable
Dns.exe6.1.7600.20874696,32006-Jan-201106:29x64
Dnsserver.events.xmlNot applicable60910-Jun-200920:31Not applicable

Workaround


To work around this issue, restart the DNS Server service.

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 nameAmd64_a3f3b0a13d94c231d1d2c005794899c9_31bf3856ad364e35_6.1.7600.20874_none_27d167e735d6f677.manifest
File versionNot applicable
File size710
Date (UTC)07-Jan-2011
Time (UTC)06:36
PlatformNot applicable
File nameAmd64_microsoft-windows-dns-server-service_31bf3856ad364e35_6.1.7600.20874_none_aa8e4b22095bfed0.manifest
File versionNot applicable
File size158,131
Date (UTC)06-Jan-2011
Time (UTC)07:13
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size1,671
Date (UTC)07-Jan-2011
Time (UTC)06:36
PlatformNot applicable