A computer that is running Microsoft Windows Storage Server 2003, Windows Server 2003 R2, or Microsoft Windows Services for UNIX 3.5 may randomly stop responding. Additionally, you receive the following Stop error message: You may experience this problem when the following conditions are both true:

•	A Network File System (NFS) client computer is used to access a file.
•	The file has the SYSTEM attribute set by using NFS.

The Stop error is more likely to occur in the following scenario:

•	The NFS client computer modifies the file attributes of a file. For example, the NFS client computer modifies the owner attribute or the group attribute.
•	This file has had the SYSTEM attribute set.
•	The SYSTEM attribute was set by using Windows Storage Server or by using Windows Services for UNIX.

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This problem occurs because of a problem in Server for NFS. When the following conditions are true, Server for NFS does not correctly detect asynchronous I/O completion operations for metadata read operations:

•	There is a handle for a file in the Server for NFS handle cache.
•	The handle in the Server for NFS handle cache was opened for asynchronous I/O because of an earlier request to Server for NFS.
•	The metadata for the file is not present in the Windows file system cache.

Under these conditions, Server for NFS does not detect the asynchronous I/O completions for the metadata read operation when Server for NFS tries to retrieve the file attribute metadata.

Therefore, Server for NFS continues without waiting for the I/O operation to finish. Some time later, the file system finishes the I/O operation. Then, the file system writes the I/O completion status to a location on the CPU stack that existed when the I/O operation started. If the stack location has been reused, memory corruption might occur. Therefore, the computer may stop responding.

Note The SYSTEM file attribute is not directly related to the problem that is described in this article. However, if this attribute is set, a timing issue is more likely to occur. This timing issue affects the way that the NTFS file system changes the way that the I/O operation finishes. Because the problem that is mentioned in this article is related to a timing issue, a change in the behavior of NTFS could affect the way that the Server for NFS problem affects the computer.

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Hotfix information

Hotfix installation information

•	The "Server for NFS" component is now part of the Windows Server 2003 R2 operating system. Installing Services for UNIX 3.5 on a Windows Server 2003 R2-based system to get NFS functionality is no longer required. It is now an optional Windows component and can be added to an R2 system by using the Add/Remove Windows Components Wizard.
•	The storage server package can only be installed in Windows Storage Server 2003.
•	The Services for UNIX 3.5 package can be installed on any Windows 2000-based, Windows XP-based, Windows Server 2003-based computer that is running Server for NFS service from Services for UNIX 3.5 software. However, the package may not be installed on a Windows Server 2003 R2-based computer.

Windows Server 2003 R2

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, your computer must be running Windows Server 2003 R2 with Service Pack 1 (SP1) or Windows Server 2003 R2 with Service Pack 2 (SP2) and Microsoft Services for NFS.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English version of this hotfix has the file attributes (or later file attributes) 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 item in Control Panel.

Windows Storage Server 2003 R2 with Service Pack 1, x86 edition

File name	File version	File size	Date	Time	Platform	SP requirement
Nfssvr.sys	5.2.3790.3038	467,456	01-Nov-2007	11:55	x86	SP1

Windows Storage Server 2003 with SP2, x86 edition

File name	File version	File size	Date	Time	Platform	SP requirement
Nfssvr.sys	5.2.3790.4182	467,456	02-Nov-2007	15:32	x86	SP2

Windows Storage Server 2003 with SP1, x64 edition

File name	File version	File size	Date	Time	Platform	SP requirement
Nfssvr.sys	5.2.3790.3038	813,568	05-Nov-2007	02:35	x64	SP1

Windows Storage Server 2003 R2 with SP2, x64 edition

File name	File version	File size	Date	Time	Platform	SP requirement
Nfssvr.sys	5.2.3790.4182	813,568	05-Nov-2007	03:00	x64	SP2

Windows Storage Server 2003

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, your computer must be running Windows Storage Server 2003 with Service Pack 1 (SP1) or Windows Storage Server 2003 with Service Pack 2 (SP2).

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English version of this hotfix has the file attributes (or later file attributes) 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 item in Control Panel.

File name	File version	File size	Date	Time	Platform
Nfssvc.exe	8.0.2254.19	57,856	18-Jul-2007	07:33	x86
Nfssvr.sys	8.0.2254.19	449,024	18-Jul-2007	07:33	Not Applicable

Windows Services for UNIX 3.5

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To install this hotfix, you must be running Windows Services for UNIX 3.5.

Restart requirement

You must restart the computer to apply the changes after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfix.

File information

The English version of this hotfix has the file attributes (or later file attributes) 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 item in Control Panel.

File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Ntdsa.dll	5.2.3790.623	1,416,192	20-Dec-2006	09:28	x86	None	RTMGDR
Ntdsa.dll	5.2.3790.623	1,432,064	20-Dec-2006	09:30	x86	None	RTMQFE
Ws03res.dll	5.2.3790.623	67,072	19-Dec-2006	09:36	x86	None	RTMQFE
Nfssvc.exe	8.0.2254.19	57,856	26-Jul-2007	06:04	x86	None	Not Applicable
Nfssvr.sys	8.0.2254.19	448,896	26-Jul-2007	06:04	Not Applicable	None	Not Applicable
Ntdsa.dll	5.2.3790.2851	1,623,040	20-Dec-2006	09:44	x86	SP1	SP1GDR
Ntdsa.hp.dll	5.2.3790.2851	81,920	20-Dec-2006	09:44	x86	SP1	SP1GDR
Ntdsa.dll	5.2.3790.2851	1,521,664	20-Dec-2006	09:49	x86	SP1	SP1QFE
W03a2409.dll	5.2.3790.2851	27,136	19-Dec-2006	13:31	x86	SP1	SP1QFE

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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