Microsoft KB Archive/816500

= Computer Restarts After You Quickly Insert and Remove a PC Card =

Article ID: 816500

Article Last Modified on 10/27/2006

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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 Microsoft Windows XP-based computer may restart after you quickly insert and remove a PC Card media adapter, and you may receive a &quot;DRIVER_IRQL_NOT_LESS_OR_EQUAL&quot; stop error message (D1, {28, 2, 0, f91faa77}) if a debugger is attached.



CAUSE
Inserting or removing a PC Card calls several Pcmcia.sys driver functions. The Pcmcia driver also keeps track of the child devices that are attached (or removed) in private memory. The private memory is updated with the latest status of the attached (or removed) devices. However, there is a race condition in the Pcmcia driver. If you remove the device immediately after you insert it, the private memory is not initialized correctly. An attempt to access a field that is not valid in the private memory causes the &quot;DRIVER_IRQL_NOT_LESS_OR_EQUAL&quot; error message.



Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

322389 How to obtain the latest Windows XP service pack

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 Windows XP service pack that contains this hotfix.

To resolve this problem immediately, 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/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.

The English version of this fix 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   Platform 20-Mar-2003 22:28  5.1.2600.1188  115,840  Pcmcia.sys  i386 20-Mar-2003 22:28  5.1.2600.1188  308,992  Pcmcia.sys  IA64



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in Microsoft Windows XP Service Pack 2.

Keywords: kbbug kbfix kbqfe kbwinxpsp2fix kbwinxppresp2fix kbhotfixserver KB816500

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