FIX: An application that is based on the .NET Framework 2.0 stops responding on a computer that has more than 32 processors, and the .NET Framework 2.0 Service Pack 2 or the .NET Framework 3.5 Service Pack 1 is installed

Symptoms

Consider the following scenario:

  • You have the Microsoft .NET Framework 2.0 Service Pack 2 (SP2) or the Microsoft .NET Framework 3.5 Service Pack 1 (SP1) installed on a computer that has more than 32 processors.

  • You run an application that is based on the .NET Framework 2.0.

  • The application calls the ThreadPool class.

  • The application also calls the NtGetCurrentProcessorNumber function to obtain the actual number of processors in the computer.


In this scenario, the application stops responding. If you debug the problem, you notice that a thread is waiting for a flag in the mscorwks!ThreadpoolMgr::RecycleMemory method.

Cause

This problem occurs because the maximum number of processors that the common language runtime (CLR) 2.0 can report is 32. However, when the NtGetCurrentProcessorNumber function obtains the actual number of processors in the computer, and this number is greater than 32 processors, the ThreadpoolMgr::RecycleMemory method enters an infinite loop.

Resolution

To resolve this problem, apply this hotfix to the computer on which you have the .NET Framework 2.0 SP2 or the .NET Framework 3.5 SP1 installed. To work around this problem, see the "Workaround" section.

More information about this hotfix

Hotfix information

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

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft website:

http://support.microsoft.com/contactus/?ws=supportNote 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.

Prerequisites

You must have one of the following installed to apply this hotfix:

  • Microsoft .NET Framework 2.0 Service Pack 2 (SP2)

  • Microsoft .NET Framework 3.5 Service Pack 1 (SP1)



Restart information

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

Note For additional file information, see the "More Information" section.

Windows Vista and Windows Server 2008 file information

For all supported x86-based versions of Windows Vista SP2 and Windows Server 2008 SP2

File name

File version

File size

Date

Time

Platform

Mscorlib.dll

2.0.50727.4474

4,550,656

23-Aug- 2010

10:57

x86

Mscordacwks.dll

2.0.50727.4474

989,016

23-Aug- 2010

10:56

x86

Mscorwks.dll

2.0.50727.4474

5,819,728

23-Aug- 2010

10:57

x86

Sos.dll

2.0.50727.4474

388,936

23-Aug- 2010

10:57

x86

For all supported x64-based versions of Windows Vista SP2 and Windows Server 2008 SP2

File name

File version

File size

Date

Time

Platform

Mscorlib.dll

2.0.50727.4474

4,567,040

23-Aug- 2010

10:56

x64

Mscordacwks.dll

2.0.50727.4474

1,758,552

23-Aug- 2010

10:56

x64

Mscorwks.dll

2.0.50727.4474

10,053,456

23-Aug- 2010

10:56

x64

Sos.dll

2.0.50727.4474

485,192

23-Aug- 2010

10:56

x64

For all supported IA-64-based versions of Windows Server 2008 SP2

File name

File version

File size

Date

Time

Platform

Mscorlib.dll

2.0.50727.4474

4,009,984

23-Aug-2010

10:57

IA-64

Mscordacwks.dll

2.0.50727.4474

3,085,144

23-Aug-2010

10:57

IA-64

Mscorwks.dll

2.0.50727.4474

20,176,720

23-Aug-2010

10:57

IA-64

Sos.dll

2.0.50727.4474

872,776

23-Aug-2010

10:57

IA-64

Windows 7 and Windows Server 2008 R2 file information

For all supported x86-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Mscorlib.dll

2.0.50727.5024

4,550,656

21-Aug-2010

00:57

x86

Mscordacwks.dll

2.0.50727.5024

995,672

21-Aug-2010

00:57

x86

Mscorwks.dll

2.0.50727.5024

5,822,800

21-Aug-2010

00:57

x86

Sos.dll

2.0.50727.5024

388,936

21-Aug-2010

00:58

x86

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

File name

File version

File size

Date

Time

Platform

Mscorlib.dll

2.0.50727.5024

4,567,040

21-Aug-2010

00:59

x64

Mscordacwks.dll

2.0.50727.5024

1,755,480

21-Aug-2010

00:59

x64

Mscorwks.dll

2.0.50727.5024

10,042,704

21-Aug-2010

00:59

x64

Sos.dll

2.0.50727.5024

485,192

21-Aug-2010

00:59

x64

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

File name

File version

File size

Date

Time

Platform

Mscorlib.dll

2.0.50727.5024

4,009,984

21-Aug-2010

00:17

IA-64

Mscordacwks.dll

2.0.50727.5024

3,082,072

21-Aug-2010

00:17

IA-64

Mscorwks.dll

2.0.50727.5024

20,189,008

21-Aug-2010

00:17

IA-64

Sos.dll

2.0.50727.5024

872,776

21-Aug-2010

00:17

IA-64

Workaround

To work around this problem, use one of the following methods.

Method 1

Upgrade the .NET Framework to Microsoft .NET Framework 4.0.

Method 2

Set the processor affinity mask to the first 32 processors by using the SetProcessAffinityMask function. For more information about the SetProcessAffinityMask function, visit the following Microsoft Developer Network (MSDN) website:

SetProcessAffinityMask Function

Status

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

More Information

Additional file information for Windows Vista and for Windows Server 2008

Additional files for all supported x86-based versions of Windows Vista SP2 and of Windows Server 2008 SP2

File name

X86_mscorlib_b77a5c561934e089_6.0.6002.22472_none_b0cba9d4db4dd1f6.manifest

File version

Not Applicable

File size

544,632

Date (UTC)

23-Aug-2010

Time (UTC)

18:02

File name

X86_netfx-mscordacwks_b03f5f7f11d50a3a_6.0.6002.22472_none_14369ba920d6424e.manifest

File version

Not Applicable

File size

6,241

Date (UTC)

23-Aug-2010

Time (UTC)

18:00

File name

X86_netfx-mscorwks_dll_b03f5f7f11d50a3a_6.0.6002.22472_none_1b7278c248d5367b.manifest

File version

Not Applicable

File size

25,247

Date (UTC)

23-Aug-2010

Time (UTC)

18:02

Additional files for all supported x64-based versions of Windows Vista SP2 and of Windows Server 2008 SP2

File name

Amd64_mscorlib_b77a5c561934e089_6.0.6002.22472_none_691e72fdc6d1a8f0.manifest

File version

Not Applicable

File size

607,386

Date (UTC)

23-Aug-2010

Time (UTC)

18:10

File name

Amd64_netfx-mscordacwks_b03f5f7f11d50a3a_6.0.6002.22472_none_cc8964d20c5a1948.manifest

File version

Not Applicable

File size

6,267

Date (UTC)

23-Aug-2010

Time (UTC)

18:08

File name

Amd64_netfx-mscorwks_dll_b03f5f7f11d50a3a_6.0.6002.22472_none_d3c541eb34590d75.manifest

File version

Not Applicable

File size

24,663

Date (UTC)

23-Aug-2010

Time (UTC)

18:09

File name

X86_mscorlib_b77a5c561934e089_6.0.6002.22472_none_b0cba9d4db4dd1f6.manifest

File version

Not Applicable

File size

544,632

Date (UTC)

23-Aug-2010

Time (UTC)

18:02

File name

X86_netfx-mscordacwks_b03f5f7f11d50a3a_6.0.6002.22472_none_14369ba920d6424e.manifest

File version

Not Applicable

File size

6,241

Date (UTC)

23-Aug-2010

Time (UTC)

18:00

File name

X86_netfx-mscorwks_dll_b03f5f7f11d50a3a_6.0.6002.22472_none_1b7278c248d5367b.manifest

File version

Not Applicable

File size

25,247

Date (UTC)

23-Aug-2010

Time (UTC)

18:02

Additional files for all supported IA-64-based versions of Windows Server 2008 SP2

File name

Ia64_mscorlib_b77a5c561934e089_6.0.6002.22472_none_b0cb8796db4e09da.manifest

File version

Not Applicable

File size

607,375

Date (UTC)

23-Aug-2010

Time (UTC)

17:35

File name

Ia64_netfx-mscordacwks_b03f5f7f11d50a3a_6.0.6002.22472_none_1436796b20d67a32.manifest

File version

Not Applicable

File size

6,257

Date (UTC)

23-Aug-2010

Time (UTC)

17:33

File name

Ia64_netfx-mscorwks_dll_b03f5f7f11d50a3a_6.0.6002.22472_none_1b72568448d56e5f.manifest

File version

Not Applicable

File size

24,611

Date (UTC)

23-Aug-2010

Time (UTC)

17:34

File name

Ia64_netfx-sos_dll_b03f5f7f11d50a3a_6.0.6002.22472_none_fd04c12c14cb5647.manifest

File version

Not Applicable

File size

4,124

Date (UTC)

23-Aug-2010

Time (UTC)

17:32

File name

X86_mscorlib_b77a5c561934e089_6.0.6002.22472_none_b0cba9d4db4dd1f6.manifest

File version

Not Applicable

File size

544,632

Date (UTC)

23-Aug-2010

Time (UTC)

18:02

File name

X86_netfx-mscordacwks_b03f5f7f11d50a3a_6.0.6002.22472_none_14369ba920d6424e.manifest

File version

Not Applicable

File size

6,241

Date (UTC)

23-Aug-2010

Time (UTC)

18:00

File name

X86_netfx-mscorwks_dll_b03f5f7f11d50a3a_6.0.6002.22472_none_1b7278c248d5367b.manifest

File version

Not Applicable

File size

25,247

Date (UTC)

23-Aug-2010

Time (UTC)

18:02

File name

X86_netfx-sos_dll_b03f5f7f11d50a3a_6.0.6002.22472_none_fd04e36a14cb1e63.manifest

File version

Not Applicable

File size

4,115

Date (UTC)

23-Aug-2010

Time (UTC)

17:59

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

X86_mscorlib_b77a5c561934e089_6.1.7600.20788_none_856fe847974f321e.manifest

File version

Not Applicable

File size

331,675

Date (UTC)

26-Aug-2010

Time (UTC)

19:13

File name

X86_netfx-mscordacwks_b03f5f7f11d50a3a_6.1.7600.20788_none_e8dada1bdcd7a276.manifest

File version

Not Applicable

File size

2,730

Date (UTC)

26-Aug-2010

Time (UTC)

19:10

File name

X86_netfx-mscorwks_dll_b03f5f7f11d50a3a_6.1.7600.20788_none_f016b73504d696a3.manifest

File version

Not Applicable

File size

6,923

Date (UTC)

26-Aug-2010

Time (UTC)

19:12

File name

X86_netfx-sos_dll_b03f5f7f11d50a3a_6.1.7600.20788_none_d1a921dcd0cc7e8b.manifest

File version

Not Applicable

File size

2,006

Date (UTC)

26-Aug-2010

Time (UTC)

19:09

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

File name

Amd64_mscorlib_b77a5c561934e089_6.1.7600.20788_none_3dc2b17082d30918.manifest

File version

Not Applicable

File size

368,857

Date (UTC)

26-Aug-2010

Time (UTC)

07:51

File name

Amd64_netfx-mscordacwks_b03f5f7f11d50a3a_6.1.7600.20788_none_a12da344c85b7970.manifest

File version

Not Applicable

File size

2,738

Date (UTC)

26-Aug-2010

Time (UTC)

07:47

File name

Amd64_netfx-mscorwks_dll_b03f5f7f11d50a3a_6.1.7600.20788_none_a869805df05a6d9d.manifest

File version

Not Applicable

File size

6,927

Date (UTC)

26-Aug-2010

Time (UTC)

07:50

File name

Amd64_netfx-sos_dll_b03f5f7f11d50a3a_6.1.7600.20788_none_89fbeb05bc505585.manifest

File version

Not Applicable

File size

2,010

Date (UTC)

26-Aug-2010

Time (UTC)

07:45

File name

X86_mscorlib_b77a5c561934e089_6.1.7600.20788_none_856fe847974f321e.manifest

File version

Not Applicable

File size

331,675

Date (UTC)

26-Aug-2010

Time (UTC)

06:57

File name

X86_netfx-mscordacwks_b03f5f7f11d50a3a_6.1.7600.20788_none_e8dada1bdcd7a276.manifest

File version

Not Applicable

File size

2,730

Date (UTC)

26-Aug-2010

Time (UTC)

06:53

File name

X86_netfx-mscorwks_dll_b03f5f7f11d50a3a_6.1.7600.20788_none_f016b73504d696a3.manifest

File version

Not Applicable

File size

6,923

Date (UTC)

26-Aug-2010

Time (UTC)

06:56

File name

X86_netfx-sos_dll_b03f5f7f11d50a3a_6.1.7600.20788_none_d1a921dcd0cc7e8b.manifest

File version

Not Applicable

File size

2,006

Date (UTC)

26-Aug-2010

Time (UTC)

06:52

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

File name

Ia64_mscorlib_b77a5c561934e089_6.1.7600.20788_none_856fc609974f6a02.manifest

File version

Not Applicable

File size

368,856

Date (UTC)

26-Aug-2010

Time (UTC)

07:48

File name

Ia64_netfx-mscordacwks_b03f5f7f11d50a3a_6.1.7600.20788_none_e8dab7dddcd7da5a.manifest

File version

Not Applicable

File size

2,737

Date (UTC)

26-Aug-2010

Time (UTC)

07:44

File name

Ia64_netfx-mscorwks_dll_b03f5f7f11d50a3a_6.1.7600.20788_none_f01694f704d6ce87.manifest

File version

Not Applicable

File size

6,926

Date (UTC)

26-Aug-2010

Time (UTC)

07:47

File name

Ia64_netfx-sos_dll_b03f5f7f11d50a3a_6.1.7600.20788_none_d1a8ff9ed0ccb66f.manifest

File version

Not Applicable

File size

2,009

Date (UTC)

26-Aug-2010

Time (UTC)

07:43

File name

X86_mscorlib_b77a5c561934e089_6.1.7600.20788_none_856fe847974f321e.manifest

File version

Not Applicable

File size

331,675

Date (UTC)

26-Aug-2010

Time (UTC)

06:57

File name

X86_netfx-mscordacwks_b03f5f7f11d50a3a_6.1.7600.20788_none_e8dada1bdcd7a276.manifest

File version

Not Applicable

File size

2,730

Date (UTC)

26-Aug-2010

Time (UTC)

06:53

File name

X86_netfx-mscorwks_dll_b03f5f7f11d50a3a_6.1.7600.20788_none_f016b73504d696a3.manifest

File version

Not Applicable

File size

6,923

Date (UTC)

26-Aug-2010

Time (UTC)

06:56

File name

X86_netfx-sos_dll_b03f5f7f11d50a3a_6.1.7600.20788_none_d1a921dcd0cc7e8b.manifest

File version

Not Applicable

File size

2,006

Date (UTC)

26-Aug-2010

Time (UTC)

06:52


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