Symptoms

Consider the following scenario:

  • You have a computer that is running Windows Server 2008, Windows Vista, Windows 7 or Windows Server 2008 R2.

  • You use Microsoft iSCSI Initiator to manage persistent Internet SCSI (iSCSI) targets.

  • You frequently add, remove, or query the persistent iSCSI targets information.

In this scenario, the handle count of the system process increases constantly. After this issue persists for some time, the memory resource is exhausted. Then you experience one or more of the following issues:

  • Many services or applications stop working.

  • The whole computer stops responding.

Then, you must restart the computer to recover from this issue.

Note If you monitor the leaked handles information, you find that all handles are registry handles. Additionally, these handles are related to persistent targets.

Cause

The issue occurs because the iSCSI driver (Msiscsi.sys) does not close all registry handles after you query the persistent iSCSI targets information. This behavior causes a handles-leak in the System process.

Resolution

Hotfix information

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 the problem described in this article. 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:

http://support.microsoft.com/contactus/?ws=supportNote 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, you must have one of the following operating systems installed on your computer:

  • Windows Vista Service Pack 1 (SP1)

  • Windows Vista Service Pack 2 (SP2)

  • Windows Server 2008

  • Windows Server 2008 Service Pack 2 (SP2)

  • Windows 7

  • Windows Server 2008 R2

For more information about how to obtain a Windows Vista service pack, click the following article number to view the article in the Microsoft Knowledge Base:

935791 How to obtain the latest Windows Vista service pack

For more information about how to obtain a Windows Server 2008 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

968849 How to obtain the latest service pack for Windows Server 2008

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows Vista and Windows Server 2008 file information notes

Important Windows Vista hotfixes and Windows Server 2008 hotfixes are included in the same packages. However, only "Windows Vista" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows Vista" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    Version

    Product

    SR_Level

    Service branch

    6.0.600
    1.
    22xxx

    Windows Vista and Windows Server 2008

    SP1

    LDR

    6.0.600
    2.
    22xxx

    Windows Vista and Windows Server 2008

    SP2

    LDR

  • Service Pack 1 is integrated into the release version of Windows Server 2008.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 and for Windows Vista" section. MUM files and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Iscsi.inf_loc

Not applicable

838

05-Mar-2010

00:24

Not applicable

Iscsi.inf_loc

Not applicable

854

04-Mar-2010

19:51

Not applicable

Iscsi.inf

Not applicable

7,436

04-Mar-2010

13:24

Not applicable

Iscsilog.dll

6.0.6001.22648

16,384

04-Mar-2010

16:03

x86

Msiscsi.sys

6.0.6001.22648

182,160

04-Mar-2010

18:35

x86

Iscsi.inf

Not applicable

7,436

04-Mar-2010

13:19

Not applicable

Iscsilog.dll

6.0.6002.22354

16,384

04-Mar-2010

15:44

x86

Msiscsi.sys

6.0.6002.22354

182,144

04-Mar-2010

18:26

x86

For all supported x64-based versions of Windows Server 2008 and of Windows Vista

File name

File version

File size

Date

Time

Platform

Iscsi.inf_loc

Not applicable

838

05-Mar-2010

01:03

Not applicable

Iscsi.inf_loc

Not applicable

854

04-Mar-2010

20:26

Not applicable

Iscsi.inf_loc

Not applicable

854

04-Mar-2010

20:26

Not applicable

Iscsi.inf

Not applicable

7,444

04-Mar-2010

13:23

Not applicable

Iscsilog.dll

6.0.6001.22648

16,384

04-Mar-2010

16:27

x64

Msiscsi.sys

6.0.6001.22648

217,488

04-Mar-2010

18:59

x64

Iscsi.inf

Not applicable

7,444

04-Mar-2010

13:20

Not applicable

Iscsilog.dll

6.0.6002.22354

16,384

04-Mar-2010

16:00

x64

Msiscsi.sys

6.0.6002.22354

217,984

04-Mar-2010

18:25

x64

For all supported IA-64-based versions of Windows Server 2008

File name

File version

File size

Date

Time

Platform

Iscsi.inf_loc

Not applicable

858

04-Mar-2010

18:15

Not applicable

Iscsi.inf

Not applicable

7,440

04-Mar-2010

13:22

Not applicable

Iscsilog.dll

6.0.6001.22648

16,384

04-Mar-2010

16:11

IA-64

Msiscsi.sys

6.0.6001.22648

503,688

04-Mar-2010

18:47

IA-64

Iscsi.inf

Not applicable

7,440

04-Mar-2010

13:19

Not applicable

Iscsilog.dll

6.0.6002.22354

16,384

04-Mar-2010

15:57

IA-64

Msiscsi.sys

6.0.6002.22354

503,688

04-Mar-2010

18:20

IA-64

Windows 7 and Windows Server 2008 R2 file information notes


Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Msiscsi.sys

6.1.7600.20820

233,344

19-Oct-2010

08:14

x86

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Msiscsi.sys

6.1.7600.20820

273,792

19-Oct-2010

09:23

x64

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Msiscsi.sys

6.1.7600.20820

680,320

19-Oct-2010

07:54

IA-64

Status

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

More Information

For more information about the iSCSI Target, visit the following Microsoft Tech Web sites:

How to manage the iSCSI Target

For more information about how to configure persistent logons to the target, click the following article number to view the article in the Microsoft Knowledge Base:

870964 File shares on iSCSI devices may not be re-created when you restart the computer

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

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

Additional file information for Windows Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista and of Windows Server 2008

File name

Update.mum

File version

Not applicable

File size

40,170

Date (UTC)

05-Mar-2010

Time (UTC)

05:52

Platform

Not applicable

File name

X86_iscsi.inf_31bf3856ad364e35_6.0.6001.22648_none_3d2a2e9d0cdd7e37.manifest

File version

Not applicable

File size

2,250

Date (UTC)

05-Mar-2010

Time (UTC)

05:53

Platform

Not applicable

File name

X86_iscsi.inf_31bf3856ad364e35_6.0.6002.22354_none_3f01cf710a0f89f0.manifest

File version

Not applicable

File size

2,250

Date (UTC)

05-Mar-2010

Time (UTC)

05:53

Platform

Not applicable

Additional files for all supported x64-based versions of Windows Vista and of Windows Server 2008

File name

Amd64_iscsi.inf_31bf3856ad364e35_6.0.6001.22648_none_9948ca20c53aef6d.manifest

File version

Not applicable

File size

2,252

Date (UTC)

05-Mar-2010

Time (UTC)

05:53

Platform

Not applicable

File name

Amd64_iscsi.inf_31bf3856ad364e35_6.0.6002.22354_none_9b206af4c26cfb26.manifest

File version

Not applicable

File size

2,252

Date (UTC)

05-Mar-2010

Time (UTC)

05:53

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

40,558

Date (UTC)

05-Mar-2010

Time (UTC)

05:52

Platform

Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008

File name

Ia64_iscsi.inf_31bf3856ad364e35_6.0.6001.22648_none_3d2bd2930cdb8733.manifest

File version

Not applicable

File size

2,251

Date (UTC)

05-Mar-2010

Time (UTC)

05:53

Platform

Not applicable

File name

Ia64_iscsi.inf_31bf3856ad364e35_6.0.6002.22354_none_3f0373670a0d92ec.manifest

File version

Not applicable

File size

2,251

Date (UTC)

05-Mar-2010

Time (UTC)

05:53

Platform

Not applicable

File name

Update.mum

File version

Not applicable

File size

7,249

Date (UTC)

05-Mar-2010

Time (UTC)

05:52

Platform

Not applicable

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7

File name

Update.mum

File version

Not Applicable

File size

1,619

Date (UTC)

19-Oct-2010

Time (UTC)

11:00

Platform

Not Applicable

File name

X86_iscsi.inf_31bf3856ad364e35_6.1.7600.20820_none_3d5f9e506debb5ac.manifest

File version

Not Applicable

File size

2,456

Date (UTC)

19-Oct-2010

Time (UTC)

11:03

Platform

Not Applicable

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Amd64_iscsi.inf_31bf3856ad364e35_6.1.7600.20820_none_997e39d4264926e2.manifest

File version

Not Applicable

File size

2,460

Date (UTC)

19-Oct-2010

Time (UTC)

11:06

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

1,629

Date (UTC)

19-Oct-2010

Time (UTC)

11:00

Platform

Not Applicable

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File name

Ia64_iscsi.inf_31bf3856ad364e35_6.1.7600.20820_none_3d6142466de9bea8.manifest

File version

Not Applicable

File size

2,458

Date (UTC)

19-Oct-2010

Time (UTC)

11:00

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

1,445

Date (UTC)

19-Oct-2010

Time (UTC)

11:00

Platform

Not Applicable

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