SrvFindMfcb fails to obtain lock if the file name is Null (191361)


The information in this article applies to:

  • Microsoft Windows NT Server 4.0
This article was previously published under Q191361

SYMPTOMS

You may receive a STOP 0x0000000A error message that is caused by MFCBLOCK with a random value of a null pointer.

CAUSE

This occurs because a lock is being released when the lock pointer is not initialized. While searching the Master File List to determine whether the named file is already open, SrvFindMfcb returns a NULL value if the file name string is zero length. At this time, the Lock pointer has not been initialized. On returning to the calling function, Windows NT attempts to release this lock, which causes the system to stop responding with the above error message.

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 NT 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 version of this fix should have the following file attributes or later:
   Date     Time                  Size    File Name    Platform
   ------------------------------------------------------------
   7/15/98  02:32p                466,768 Srv.sys      (Alpha)

Modification Type:MinorLast Reviewed:10/5/2005
Keywords:kbbug kbfix kbQFE KB191361
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