Article ID: 826929
Article Last Modified on 10/25/2005
APPLIES TO
- Microsoft Message Queuing 2.0
SYMPTOMS
A stop error may occur in the Mqac.sys driver after you apply the Microsoft Message Queuing hotfix that is discussed in the following Microsoft Knowledge Base article:
822835 Event ID 2085 "Unable to Create Message File ..."
CAUSE
This problem occurs because a race condition on the client side of a remote read operation permits a cursor to be closed before the remote read operation closes.
RESOLUTION
Hotfix Information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.
To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
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.
Restart Requirement
You must restart your computer after you apply this hotfix.
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 --------------------------------------------------------------------------------------- 15-Aug-2003 16:01 5.3.18.6 637,800 Windows2000-kb826929-x86-enu-symbols.exe 15-Aug-2003 16:03 5.3.18.6 1,006,440 Windows2000-kb826929-x86-enu.exe 14-Aug-2003 23:07 5.0.0.778 281,360 Mq1repl.dll 17-Jun-2003 14:33 5.0.0.778 14,096 Mq1sync.exe 14-Aug-2003 16:02 5.0.0.782 76,144 Mqac.sys 14-Aug-2003 23:07 5.0.0.782 217,360 Mqads.dll 30-Oct-2002 13:43 5.0.0.761 25,360 Mqbkup.exe 14-Aug-2003 23:07 5.0.0.778 76,560 Mqdscli.dll 14-Aug-2003 23:07 5.0.0.773 42,256 Mqdssrv.dll 21-Oct-2002 17:31 5.0.0.759 98,064 Mqmig.exe 14-Aug-2003 23:07 5.0.0.759 265,488 Mqmigrat.dll 14-Aug-2003 23:07 5.0.0.740 222,480 Mqoa.dll 14-Aug-2003 23:07 5.0.0.762 8,464 Mqperf.dll 14-Aug-2003 23:07 5.0.0.782 429,328 Mqqm.dll 14-Aug-2003 23:07 5.0.0.778 102,672 Mqrt.dll 14-Aug-2003 23:07 5.0.0.776 70,928 Mqsec.dll 14-Aug-2003 23:07 5.0.0.781 400,656 Mqsnap.dll 14-Aug-2003 23:07 5.0.0.762 23,824 Mqupgrd.dll 14-Aug-2003 23:07 5.0.0.782 110,864 Mqutil.dll 14-Aug-2003 23:07 5.0.0.748 64,784 Msmq.cpl
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
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 Naming Schema for Microsoft Windows Hotfix Packages
Note This hotfix must be installed on any system running the Message Queuing service where the client is performing a remote read operation.
A remote read operation on the client side has the following phases:
- A packet is received from the remote side. At this point, the packet remains on the remote side.
- The packet is given to the Mqac.sys driver so that the run time returns from the MQReceiveMessage function.
- The remote side is notified to delete the packet.
If the application calls the MQCloseCursor function immediately after it returns from MQReceiveMessage to close the remote cursor and this call reaches the server side before phase 3, notification occurs without a valid cursor. If notification occurs without a valid cursor, the stop error may occur. This hotfix adds a critical section on the client side to make sure that the MQCloseCursor function reaches the server side after phase 3.
Additional query words: MSMQ
Keywords: kbbug kbfix kbqfe kbwin2000presp5fix kbhotfixserver KB826929
