Article ID: 921401
Article Last Modified on 10/11/2007
APPLIES TO
- Microsoft Windows XP Home Edition
- Microsoft Windows XP Professional
- Microsoft Windows XP Professional x64 Edition
- Microsoft Windows Server 2003, Datacenter Edition for Itanium-Based Systems
- Microsoft Windows Server 2003, Enterprise Edition for Itanium-based Systems
- Microsoft Windows Server 2003, Datacenter x64 Edition
- Microsoft Windows Server 2003, Enterprise x64 Edition
- Microsoft Windows Server 2003, Standard x64 Edition
- Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
- Microsoft Windows Server 2003, Enterprise Edition
- Microsoft Windows Server 2003, Standard Edition (32-bit x86)
- Microsoft Windows Server 2003, Web Edition
SYMPTOMS
When you use a program to capture specific Musical Instrument Digital Interface (MIDI) SYSEx messages on a computer that is running Microsoft Windows XP or Microsoft Windows Server 2003, the computer may gradually become less responsive. Eventually, the computer may stop responding.
CAUSE
This problem occurs because a leak occurs in the system non-paged memory pool. Non-paged kernel mode memory usage may increase until the memory is exhausted. If you analyze the non-paged pool tags, you can see that MXF is the largest consumer of non-paged pool. The MXF pool tag is the tag for the DirectMusic pool, or the "MIDI Transform Filter."
RESOLUTION
Windows XP 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:
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 XP, x86-based versions
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Portcls.sys | 5.1.2600.2950 | 146,048 | 12-Jul-2006 | 13:50 | x86 |
Windows XP, x64-based version
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Portcls.sys | 5.2.3790.2758 | 246,272 | 27-Jul-2006 | 15:37 | x64 |
Windows Server 2003 service pack information
To resolve this problem, obtain the latest service pack for Windows Server 2003. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
889100 How to obtain the latest service pack for Windows Server 2003
Windows Server 2003 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:
Prerequisites
To apply this hotfix, your computer must be running one of the following operating systems:
- A 32-bit version of Windows Server 2003 with Service Pack 1 (SP1)
- An Itanium-based version of Windows Server 2003 with SP1
- An x64-based version of Windows
Restart requirement
You must restart your computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace a previously released hotfix.
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 2003, x86-based versions
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Portcls.sys | 5.2.3790.2758 | 147,456 | 27-Jul-2006 | 10:56 | x86 |
Windows Server 2003, x64-based versions
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Portcls.sys | 5.2.3790.2758 | 246,272 | 27-Jul-2006 | 15:37 | x64 |
Windows Server 2003, Itanium-based versions
| File name | File version | File size | Date | Time | Platform |
|---|---|---|---|---|---|
| Portcls.sys | 5.2.3790.2758 | 467,456 | 27-Jul-2006 | 15:33 | IA-64 |
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Server 2003 Service Pack 2.
MORE INFORMATION
For more information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:
816915 New file naming schema for Microsoft Windows software update packages
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
Technical support for x64-based versions of Microsoft Windows
If your hardware came with a Microsoft Windows x64 edition already installed, your hardware manufacturer provides technical support and assistance for the Windows x64 edition. In this case, your hardware manufacturer provides support because a Windows x64 edition was included with your hardware. Your hardware manufacturer might have customized the Windows x64 edition installation by using unique components. Unique components might include specific device drivers or might include optional settings to maximize the performance of the hardware. Microsoft will provide reasonable-effort assistance if you need technical help with a Windows x64 edition. However, you might have to contact your manufacturer directly. Your manufacturer is best qualified to support the software that your manufacturer installed on the hardware. If you purchased a Windows x64 edition such as a Microsoft Windows Server 2003 x64 edition separately, contact Microsoft for technical support.
For product information about Microsoft Windows XP Professional x64 Edition, visit the following Microsoft Web site:
For product information about x64-based versions of Microsoft Windows Server 2003, visit the following Microsoft Web site:
Additional query words: MIDI SysEx DMusic memory leak Winx64 Windowsx64 64bit 64-bit
Keywords: kbbug kbqfe kbwinxppresp3fix kbexpertiseinter kbwinserv2003presp2fix kbwinserv2003sp2fix KB921401
