Memory leak occurs in the Spoolsv.exe process after you run an application that performs WMI queries in Windows 7 or Windows Server 2008 R2


Consider the following scenario:
  • Network printers are installed on a print server that is running Windows Server 2008 or Windows Server 2008 R2.
  • You connect to the server from a client computer that is running Windows 7 or Windows Server 2008 R2.
  • You run an application on the client computer that collects print job information by performing Windows Management Instrumentation (WMI) queries.
  • The application uses the WMI ExecNotificationQuery method.
In this scenario, a memory leak may occur in the Spoolsv.exe process. This memory leak issue occurs on the client and server-side.

Note This issue does not occur when the computers are in a domain environment.


This issue occurs because Win32spl.dll impersonates the OpenPrinter function but does not impersonate the ClosePrinter function. However, a printer handle that is allocated in the OpenPrinter function is deleted in the ClosePrinter function. Therefore, the ClosePrinter function fails, and a handle leak occurs.


To resolve this issue, apply hotfix 2796647 on the client computer.

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 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.


To apply this hotfix, you must be running one of the following operating systems:
  • Windows 7
  • Windows 7 Service Pack 1 (SP1)
  • Windows Server 2008 R2
  • Windows Server 2008 R2 Service Pack 1 (SP1)
For more information about how to obtain a Windows 7 or 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 apply this hotfix, 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


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

Номер статьи: 2796647 — последний просмотр: 13 февр. 2013 г. — редакция: 1

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