Microsoft KB Archive/828274

= FIX: IoBuildPartialMdl API does not propagate the device memory flag =

Article ID: 828274

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Professional
 * Microsoft Windows XP Professional

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SYMPTOMS
A device driver that uses device I/O MDL, as opposed to a regular memory MDL, and then passes the MDL to the IoBuildPartialMdl function as the SourceMdl parameter, may crash the system. The crash may occur when the resulting partial MDL is referenced later.

When the crash occurs, you may receive the following error message on the stop error screen:

Stop 0x00000050 PAGE_FAULT_IN_NONPAGED_AREA



CAUSE
There is a bug in the IoBuildPartialMdl function that does not copy an internal flag from the main MDL to the partial MDL. This causes the partial MDL to point to regular memory space instead of I/O space. Therefore, memory manager may later crash.



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:

http://go.microsoft.com/?linkid=6294451

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:

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

File information
The English version of this hotfix has the file attributes (or later) 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.

  Date         Time   Version            Size    File name --  08-Sep-2003  23:28  5.1.2600.1267   1,896,960  Ntkrnlmp.exe 08-Sep-2003 23:29  5.1.2600.1267   1,953,024  Ntkrnlpa.exe 08-Sep-2003 23:29  5.1.2600.1267   1,924,608  Ntkrpamp.exe 09-Sep-2003 00:56  5.1.2600.1267   2,049,408  Ntoskrnl.exe



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 additional 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 additional 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: kbhotfixserver kbqfe kbqfe kbbug kbwinxppresp2fix kbfix KB828274

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