Microsoft KB Archive/930012

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Article ID: 930012

Article Last Modified on 11/15/2007


  • Microsoft XML Core Services 6.0


In an application that uses Microsoft XML Core Services (MSXML) 6.0, you try to open a Document Object Model (DOM) document, or you try to close a DOM document. When you do this, the application may stop responding.

Note This problem also occurs in an application that uses Microsoft XML Core Services (MSXML) 4.0 Service Pack 2 (SP2) or a version of MSXML that is earlier than MSXML 4.0 SP2.


This problem occurs when the DOM document uses more than 256 threads to manipulate MSXML objects. MSXML uses semaphore objects to make sure that only one thread is performing garbage collection at a time. When more than 256 threads must access one semaphore object, the semaphore object may not function correctly, and the application may stop responding.


Hotfix information

A supported hotfix is now 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 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:


The following list contains prerequisites for the hotfix:

  • MSXML 6.0 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 hotfixes.

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.

File name File version File size Date Time Platform
Msxml6.dll 6.10.1132.0 1,319,776 22-Mar-2007 17:35 x86
Msxml6r.dll 6.0.3883.0 79,872 22-Mar-2007 17:31 x86


To work around this problem, reduce the number of threads that manipulate MSXML objects in the application at the same time. Reduce the number of threads to fewer than 256. A thread must exit completely before an associated MSXML object is released for garbage collection.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


For more 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

Keywords: kbbug kbfix kbqfe kbprb kbpubtypekc kbexpertiseinter kbexpertisebeginner kbhotfixserver KB930012