Symptoms

Consider the following scenario:

  • You install Utilities and SDK for Subsystem for UNIX-based Applications (SUA) on a computer that is running Windows 7 or Windows Server 2008 R2.

  • You run an application that uses portable operating system interface (POSIX) threads on the computer.

  • The application creates child processes by using the Fork()¬†function, and occasionally ends these child processes.
    Note Individual processes can be single-threaded.

In this scenario, the Psxss.exe process may stop unexpectedly, and the following event is logged into the Application log:

Log Name: Application
Source: Application Error
Date: date
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: computer
Description: Faulting application psxss.exe, version version, time stamp time stamp, faulting module ntdll.dll, version version, time stamp time stamp, exception code 0xc0000005, fault offset offset, process id process id, application start time time.

Cause

This issue occurs because the pointer to the session structure of the process is not set to NULL after the structure is released. This behavior consumes the memory where the session structure is located. This causes heap corruptions, deadlocks, or access violations.

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 website:

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 be running one of the following operating systems:

  • Windows 7

  • Windows 7 Service Pack 1 (SP1)

  • Windows Server 2008 R2

  • Windows Server 2008 R2 Service Pack 1 (SP1)

For more information about how to obtain a Windows 7 or Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To apply this hotfix, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

The global 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 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 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

    Milestone

    Service branch

    6.1.760
    0.16xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    GDR

    6.1.760
    1.17xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    GDR

    6.1.760
    1.22xxx

    Windows 7 and Windows Server 2008 R2

    SP1

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • 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 7 and for Windows Server 2008 R2" section. MUM 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 7

File name

File version

File size

Date

Time

Platform

Baseu.dnl

Not applicable

166

10-Jun-2009

21:46

Not applicable

Baseu.prm

Not applicable

1,153

10-Jun-2009

21:46

Not applicable

Desktop.ini

Not applicable

81

10-Jun-2009

21:46

Not applicable

Disablesetuid.ini

Not applicable

92

10-Jun-2009

21:46

Not applicable

Enablesetuid.ini

Not applicable

92

10-Jun-2009

21:46

Not applicable

Posix.exe

6.1.7601.17514

80,896

20-Nov-2010

12:17

x86

Posixsscom.dll

6.1.7600.16385

5,632

14-Jul-2009

01:16

x86

Psxdll.dll

6.1.7601.22443

309,248

06-Sep-2013

02:06

x86

Psxdllsvr.dll

6.1.7601.22443

357,888

06-Sep-2013

02:06

x86

Psxdrv.sys

6.1.7600.16385

9,216

13-Jul-2009

23:23

x86

Psxrun.exe

6.1.7600.16385

40,960

14-Jul-2009

01:14

x86

Psxss.exe

6.1.7601.22443

657,408

06-Sep-2013

01:04

x86

Suares.dll

6.1.7600.16385

2,048

14-Jul-2009

01:10

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

Baseu.dnl

Not applicable

166

05-Nov-2010

02:20

Not applicable

Baseu.prm

Not applicable

1,153

05-Nov-2010

02:20

Not applicable

Disablesetuid.ini

Not applicable

92

05-Nov-2010

02:20

Not applicable

Enablesetuid.ini

Not applicable

92

05-Nov-2010

02:20

Not applicable

Posix.exe

6.1.7601.17514

89,088

20-Nov-2010

13:25

x64

Psxdll.dll

6.1.7601.22443

330,240

06-Sep-2013

02:28

x64

Psxdllsvr.dll

6.1.7601.22443

378,368

06-Sep-2013

02:28

x64

Psxdrv.sys

6.1.7601.17514

10,240

20-Nov-2010

09:45

x64

Psxrun.exe

6.1.7601.17514

44,032

20-Nov-2010

13:25

x64

Psxss.exe

6.1.7601.22443

849,408

06-Sep-2013

01:17

x64

Suares.dll

6.1.7601.17514

2,048

20-Nov-2010

13:14

x64

Baseu.dnl

Not applicable

166

10-Jun-2009

21:08

Not applicable

Baseu.prm

Not applicable

1,153

10-Jun-2009

21:08

Not applicable

Desktop.ini

Not applicable

81

10-Jun-2009

21:08

Not applicable

Disablesetuid.ini

Not applicable

92

10-Jun-2009

21:08

Not applicable

Enablesetuid.ini

Not applicable

92

10-Jun-2009

21:08

Not applicable

Posix.exe

6.1.7601.17514

89,088

20-Nov-2010

13:25

x64

Psxdll.dll

6.1.7601.22443

330,240

06-Sep-2013

02:28

x64

Psxdllsvr.dll

6.1.7601.22443

378,368

06-Sep-2013

02:28

x64

Psxdrv.sys

6.1.7600.16385

10,240

13-Jul-2009

23:35

x64

Psxrun.exe

6.1.7600.16385

44,032

14-Jul-2009

01:39

x64

Psxss.exe

6.1.7601.22443

849,408

06-Sep-2013

01:17

x64

Suares.dll

6.1.7600.16385

2,048

14-Jul-2009

01:33

x64

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

File name

File version

File size

Date

Time

Platform

Baseu.dnl

Not applicable

166

10-Jun-2009

21:13

Not applicable

Baseu.prm

Not applicable

1,153

10-Jun-2009

21:13

Not applicable

Desktop.ini

Not applicable

81

10-Jun-2009

21:13

Not applicable

Disablesetuid.ini

Not applicable

92

10-Jun-2009

21:13

Not applicable

Download.url

Not applicable

71

10-Jun-2009

21:13

Not applicable

Enablesetuid.ini

Not applicable

92

10-Jun-2009

21:13

Not applicable

Posix.exe

6.1.7601.17514

181,248

20-Nov-2010

10:23

IA-64

Psxdll.dll

6.1.7601.22443

718,848

06-Sep-2013

01:36

IA-64

Psxdllsvr.dll

6.1.7601.22443

744,448

06-Sep-2013

01:36

IA-64

Psxdrv.sys

6.1.7600.16385

23,552

13-Jul-2009

23:40

IA-64

Psxrun.exe

6.1.7600.16385

79,360

14-Jul-2009

01:44

IA-64

Psxss.exe

6.1.7601.22443

1,649,664

06-Sep-2013

00:49

IA-64

Sua-ppdlic.xrm-ms

Not applicable

2,981

06-Sep-2013

01:55

Not applicable

Suares.dll

6.1.7600.16385

2,048

14-Jul-2009

01:41

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

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

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

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

File property

Value

File name

X86_8f180fc806ce0776b40c6a55db7bda2f_31bf3856ad364e35_6.1.7601.22443_none_826fe8f69fbb3ca1.manifest

File version

Not applicable

File size

707

Date (UTC)

06-Sep-2013

Time (UTC)

17:13

Platform

Not applicable

File name

X86_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7601.22443_none_7657d3da6768ae7d.manifest

File version

Not applicable

File size

62,446

Date (UTC)

06-Sep-2013

Time (UTC)

17:16

Platform

Not applicable

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

File property

Value

File name

Amd64_subsystem-for-unix-..d-applications-core_31bf3856ad364e35_6.1.7601.22443_none_52eb916bd0426351.manifest

File version

Not applicable

File size

58,151

Date (UTC)

06-Sep-2013

Time (UTC)

17:19

Platform

Not applicable

File name

Amd64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7601.22443_none_d2766f5e1fc61fb3.manifest

File version

Not applicable

File size

63,787

Date (UTC)

06-Sep-2013

Time (UTC)

17:19

Platform

Not applicable

File name

Wow64_subsystem-for-unix-..d-applications-core_31bf3856ad364e35_6.1.7601.22443_none_5d403bbe04a3254c.manifest

File version

Not applicable

File size

41,461

Date (UTC)

06-Sep-2013

Time (UTC)

02:20

Platform

Not applicable

File name

Wow64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7601.22443_none_dccb19b05426e1ae.manifest

File version

Not applicable

File size

41,411

Date (UTC)

06-Sep-2013

Time (UTC)

02:20

Platform

Not applicable

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

File property

Value

File name

Ia64_6e245ed7577d701b71f6a5a803859bef_31bf3856ad364e35_6.1.7601.22443_none_73017e7a006c55f3.manifest

File version

Not applicable

File size

1,062

Date (UTC)

06-Sep-2013

Time (UTC)

17:13

Platform

Not applicable

File name

Ia64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7601.22443_none_765977d06766b779.manifest

File version

Not applicable

File size

63,784

Date (UTC)

06-Sep-2013

Time (UTC)

17:13

Platform

Not applicable

File name

Wow64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7601.22443_none_dccb19b05426e1ae.manifest

File version

Not applicable

File size

41,411

Date (UTC)

06-Sep-2013

Time (UTC)

02:20

Platform

Not applicable


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