Microsoft KB Archive/311538

= Computer quits with a blue-screen error in Mqac.sys on Windows 2000-based system =

Article ID: 311538

Article Last Modified on 2/19/2007

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APPLIES TO


 * Microsoft Message Queuing 2.0, when used with:
 * Microsoft Windows 2000 Standard Edition

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This article was previously published under Q311538



SYMPTOMS
When you use Microsoft Message Queuing, also known as MSMQ, 2.0, your computer may quit with a blue-screen error in the MQAC driver (Mqac.sys).



CAUSE
On a fast computer, there is a possible race condition in the driver when you send persistent messages and both of the following conditions are true:
 * The MQMessage_Deadletter parameter is set in the PROPID_M_JOURNAL property.

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 * The Time to be Received parameter is set to zero.



RESOLUTION
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Windows 2000 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/default.aspx?scid=fh;EN-US;CNTACTMS

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 typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English-language version of this fix should have the following file attributes or later:   Date           Time  Version    Size    File name ---  02/28/2001   17:54  5.0.0.720    273kb  mq1repl.dll 02/28/2001  17:47  5.0.0.720     14kb  mq1sync.dll 02/28/2001  17:47  5.0.0.733     70kb  mqac.sys 02/28/2001  17:54  5.0.0.721    210kb  mqads.dll 02/28/2001  17:47  5.0.0.720     22kb  mqbkup.exe 02/28/2001  17:54  5.0.0.720     29kb  mqcertui.dll 02/28/2001  17:54  5.0.0.720     49kb  mqclus.dll 02/28/2001  17:54  5.0.0.720     30kb  mqdbodbc.dll 02/28/2001  17:54  5.0.0.720     74kb  mqdscli.dll 02/28/2001  17:54  5.0.0.720     41kb  mqdssrv.dll 02/28/2001  17:47  5.0.0.720     96kb  mqmig.exe 02/28/2001  17:54  5.0.0.720    258kb  mqmigrat.dll 02/28/2001  17:54  5.0.0.720    219kb  mqoa.dll 02/28/2001  17:54  5.0.0.720      8kb  mqperf.dll 02/28/2001  17:54  5.0.0.733    406kb  mqqm.dll 02/28/2001  17:54  5.0.0.720      9kb  mqrperf.dll 02/28/2001  17:54  5.0.0.733     90kb  mqrt.dll 02/28/2001  17:54  5.0.0.720     69kb  mqsec.dll 02/28/2001  17:54  5.0.0.720    391kb  mqsnap.dll 02/28/2001  17:48  5.0.0.720     14kb  mqsvc.exe 02/28/2001  17:54  5.0.0.720     24kb  mqupgrd.dll 02/28/2001  17:54  5.0.0.720    106kb  mqutil.dll 02/28/2001  17:54  5.0.0.720     64kb  msmq.cpl 02/28/2001  17:54  5.0.0.720    156kb  msmqocm.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Keywords: kbprb kbqfe KB311538

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