Microsoft KB Archive/913996

= FIX: Error message when you use the debugger in Visual Studio 2005 to debug an MFC class library application: &quot;Managed Debugging Assistant 'LoaderLock' has detected a problem in ''&quot; =

Article ID: 913996

Article Last Modified on 5/11/2007

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APPLIES TO


 * Microsoft Visual Studio 2005 Standard Edition
 * Microsoft Visual Studio 2005 Professional Edition
 * Microsoft Visual Studio 2005 Team System Architect Edition
 * Microsoft Visual Studio 2005 Team System Developer Edition
 * Microsoft Visual Studio 2005 Team System Test Edition
 * Microsoft Visual Studio 2005 Team Foundation

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SYMPTOMS
When you use the debugger in Microsoft Visual Studio 2005 to debug a Microsoft Foundation Classes (MFC) class library application, you may receive an error message that is similar to the following:

Managed Debugging Assistant 'LoaderLock' has detected a problem in ' '. Additional Information: Attempting managed execution inside OS Loader lock. Do not attempt to run managed code inside a DllMain or image initialization function since doing so can cause the application to hang.

Note This problem does not occur when you run the same MFC class library application outside the debugger.



CAUSE
This problem occurs because of the way in which the debugger in Visual Studio 2005 runs managed applications that use Microsoft Foundation Classes version 8.0 in one or more DLL files.

For more information about how to load mixed DLL files, visit the following Microsoft Developer Network (MSDN) Web site:

http://msdn2.microsoft.com/en-us/library/aa290048(vs.71).aspx



Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Visual Studio 2005 service pack that contains this hotfix.

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

http://support.microsoft.com/contactus/?ws=support

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 usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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 tool in Control Panel.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; 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

Keywords: kbfix kbpubtypekc kbqfe kbhotfixserver KB913996

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