Microsoft KB Archive/160650

= Blue Screen When Closing Kernel Mode Handles from User Mode =

Article ID: 160650

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 Q160650



SYMPTOMS
User mode programs that close a handle that was opened up by a kernel mode component may cause a blue screen error message.



CAUSE
In Windows NT 3.51, if this happened, the handle became invalid. In Windows NT 4.0, if a kernel mode component closed an already closed handle, a blue screen error would occur. A user mode application has no way of knowing who closed the handle. A user mode application should never close a handle opened by that application in kernel mode.



STATUS
Microsoft has confirmed this to be a problem in Microsoft Windows NT version 4.0.

This problem was corrected in the latest Microsoft Windows NT 4.0 U.S. Service Pack. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Keywords: KB160650

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