Microsoft KB Archive/323571

= FIX: STI Application Stops Responding When You Try to Use UnLockDevice to Unlock the Device =

Article ID: 323571

Article Last Modified on 9/27/2005

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APPLIES TO


 * Microsoft Windows XP Professional

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This article was previously published under Q323571



SYMPTOMS
In certain instances, a Still Image Architecture (STI) application that successfully locked a device may stop responding (hang) indefinitely when you use the UnLockDevice method to try to unlock the device.



CAUSE
This problem occurs because the Windows Image Acquisition (WIA) service is deadlocked at this time and cannot process any more WIA or STI requests.



RESOLUTION
To resolve this problem, obtain the latest service pack for 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

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 -  11-Jun-2002  10:29   5.2.2.8        3,584   Spmsg.dll 19-Jun-2002 15:48   5.1.2600.48   61,952   Sti.dll 11-Jun-2002 15:50   5.1.2600.48  314,368   Wiaservc.dll



STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows XP Service Pack 1.



MORE INFORMATION
This problem occurs because of a bad assumption about which thread ID the lock belongs to. The WIA service uses the thread ID of the remote procedure call (RPC) instead of the thread ID of the client. Because RPC uses a thread pool, incoming requests may be processed on different threads, which causes the thread ID mismatch.

Keywords: kbbug kbfix kbshell kbqfe kbwinxpsp1fix kbhotfixserver KB323571

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