You receive a memory leak in nonpaged pool memory in the CcBr - Cache Manager Bitmap

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Your Microsoft Windows 2000-based server may start to run very slowly, and it may eventually stop responding (hang). When this problem occurs, the following event is logged in the system event log:

Event ID: 2019
Description: The server was unable to allocate from the system nonpaged pool because the Pool was empty.

The problem occurs from a nonpaged pool memory leak in the Cache Manager Bitmap range, allocated memory block Tag CcBr. This problem may occur if the opened file contains several pages that have been modified or changed. The cache manager creates non embedded bitmaps of the file that are never released from memory.

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.


There are no prerequisites required.

Restart requirement

You must restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
   Date         Time   Version            Size    File name   --------------------------------------------------------------   19-Dec-2003  18:57  5.0.2195.6886      30,224  Mountmgr.sys   28-Jan-2004  18:48  5.0.2195.6894   1,700,032  Ntkrnlmp.exe        28-Jan-2004  18:48  5.0.2195.6894   1,699,392  Ntkrnlpa.exe        28-Jan-2004  18:48  5.0.2195.6894   1,720,192  Ntkrpamp.exe        28-Jan-2004  18:48  5.0.2195.6894   1,677,568  Ntoskrnl.exe     
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More information
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
816915 New file naming schema for Microsoft Windows software update packages
For additional information, 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
fssup.c CcDeleteMbcb mbcb

Article ID: 833266 - Last Review: 10/26/2013 09:22:00 - Revision: 3.0

  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Professional Edition
  • Microsoft Windows 2000 Advanced Server
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