Microsoft KB Archive/288899

= Dismounting an NTFS Volume May Cause Nonpaged Pool Memory Leak =

Article ID: 288899

Article Last Modified on 2/21/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition

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This article was previously published under Q288899



SYMPTOMS
If a volume is repeatedly mounted and dismounted, the NTFS file system may leak a small amount of nonpaged memory each time that the volume is dismounted. You can observe the leak in the NtFL pool tag by using PoolMon.exe. For additional information about how to use PoolMon.exe, click the article number below to view the article in the Microsoft Knowledge Base:

177415 How to Use Poolmon to Troubleshoot Kernel Mode Memory Leaks



CAUSE
This issue occurs because of a problem in the code that supports NTFS transaction logging.



RESOLUTION
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Windows 2000 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix should have the following file attributes or later:

  Date        Time       Version        Size     File name 3/12/2001  05:55p    5.0.2195.3364  512,272   Ntfs.sys



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:

265173 The Datacenter Program and Windows 2000 Datacenter Server Product

For additional information about how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base:

296861 Use QChain.exe to Install Multiple Hotfixes with One Reboot

An attempt to gain access to an unmounted volume indirectly causes the volume to be mounted. Therefore, a program might encounter this leak if the program dismounts a volume by using the DeviceIoControl function with FSCTL_DISMOUNT_VOLUME IOCTL, and then attempts to gain access to the drive again later. The leak might also occur if one program dismounts the volume and another program causes the volume to be remounted (for example, in a &quot;hot-swap&quot; configuration).

For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes

Keywords: kbhotfixserver kbqfe kbapi kbbug kbfileio kbfix kbkernbase kbqfe kbwin2000presp3fix KB288899

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