When a Windows Server 2008-based terminal server is running under a heavy load for a long time (about eight hours), an error occurs in the memory manager. In this situation, you receive the following Stop error message:
This issue occurs because of a race condition that is triggered when the memory manager deals with certain kinds of images. Specifically, a thread in one terminal server session searches for an entry in the Viphook.dll file. At the same time, a thread in another terminal server session deletes this entry. Because of this synchronization issue, the first thread returns a value of NULL.
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. 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.
To apply this hotfix, the computer must be running one of the following operating systems:
Windows Server 2008
Windows Vista Service Pack 1 (SP1)
Restart requirement
You must restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other previously released hotfixes.
Registry information
To use this hotfix, you do not have to make any changes to the registry.
File information
The English version of this hotfix has the file attributes (or later file attributes) 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 item in Control Panel.
Windows Server 2008 and Windows Vista SP1, x86-based versions
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