Microsoft KB Archive/305661

= Retried COM Function Calls That Use IMessageFilter May Cause a Leak =

Article ID: 305661

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q305661



SYMPTOMS
An event handle leak and a memory leak may occur when you are using IMessageFilter to handle incoming COM calls. Use the hotfix that is described in this article only if all of the following conditions exist:
 * The client implements IMessageFilter and SERVERCALL_RETRYLATER is returned in the implemented IMessageFilter::HandleInComingCall function.
 * The IMessageFilter::HandleInComing call in the client is called as a result of the COM layer synchronizing calls because of cross-apartment communication. An example of this is a single-threaded apartment (STA) client process calling out a multiple-threaded apartment (MTA) COM server process and the MTA COM server process calling back into the STA client process
 * The client that implements IMessageFilter is running on Windows NT 4.0. If the client is running on Microsoft Windows 2000, the leak does not occur.
 * The client process has a visible handle leak that you can observe by using a process-monitoring tool such as Windows Task Manager.
 * The client process has a visible memory leak that you can observe by using a process-monitoring tool such as Windows Task Manager.



CAUSE
This issue is caused by a problem in the COM run-time in Windows NT 4.0.



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.

To resolve this problem, 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 usual 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  Platform -  29-Aug-2001  20:44  4.0.1381.7102    701,200  Ole32.dll  i386 29-Aug-2001 20:44  4.0.1381.7102    107,280  Rpcss.exe  i386 24-Aug-2001 03:26  4.0.1381.7102  1,239,824  Ole32.dll  Alpha 24-Aug-2001 03:26  4.0.1381.7102    183,568  Rpcss.exe  Alpha NOTE: Because of file dependencies, this hotfix requires Microsoft Windows NT 4.0 Service Pack 6a.



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

Keywords: kbhotfixserver kbqfe kbbug kbenv kbfix kbqfe KB305661

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