The Psxss.exe process may stop unexpectedly on a computer that has Utilities and SDK for Subsystem for SUA installed in Windows 7 or Windows Server 2008 R2

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Article ID: 2887519 - View products that this article applies to.
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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=support
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, 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:
976932 Information 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.

File information

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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:
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    VersionProductMilestoneService branch
    6.1.760 0.16xxxWindows 7 and Windows Server 2008 R2RTMGDR
    6.1.760 1.17xxxWindows 7 and Windows Server 2008 R2SP1GDR
    6.1.760 1.22xxxWindows 7 and Windows Server 2008 R2SP1LDR
  • 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
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File nameFile versionFile sizeDateTimePlatform
Baseu.dnlNot applicable16610-Jun-200921:46Not applicable
Baseu.prmNot applicable1,15310-Jun-200921:46Not applicable
Desktop.iniNot applicable8110-Jun-200921:46Not applicable
Disablesetuid.iniNot applicable9210-Jun-200921:46Not applicable
Enablesetuid.iniNot applicable9210-Jun-200921:46Not applicable
Posix.exe6.1.7601.1751480,89620-Nov-201012:17x86
Posixsscom.dll6.1.7600.163855,63214-Jul-200901:16x86
Psxdll.dll6.1.7601.22443309,24806-Sep-201302:06x86
Psxdllsvr.dll6.1.7601.22443357,88806-Sep-201302:06x86
Psxdrv.sys6.1.7600.163859,21613-Jul-200923:23x86
Psxrun.exe6.1.7600.1638540,96014-Jul-200901:14x86
Psxss.exe6.1.7601.22443657,40806-Sep-201301:04x86
Suares.dll6.1.7600.163852,04814-Jul-200901:10x86
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For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
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File nameFile versionFile sizeDateTimePlatform
Baseu.dnlNot applicable16605-Nov-201002:20Not applicable
Baseu.prmNot applicable1,15305-Nov-201002:20Not applicable
Disablesetuid.iniNot applicable9205-Nov-201002:20Not applicable
Enablesetuid.iniNot applicable9205-Nov-201002:20Not applicable
Posix.exe6.1.7601.1751489,08820-Nov-201013:25x64
Psxdll.dll6.1.7601.22443330,24006-Sep-201302:28x64
Psxdllsvr.dll6.1.7601.22443378,36806-Sep-201302:28x64
Psxdrv.sys6.1.7601.1751410,24020-Nov-201009:45x64
Psxrun.exe6.1.7601.1751444,03220-Nov-201013:25x64
Psxss.exe6.1.7601.22443849,40806-Sep-201301:17x64
Suares.dll6.1.7601.175142,04820-Nov-201013:14x64
Baseu.dnlNot applicable16610-Jun-200921:08Not applicable
Baseu.prmNot applicable1,15310-Jun-200921:08Not applicable
Desktop.iniNot applicable8110-Jun-200921:08Not applicable
Disablesetuid.iniNot applicable9210-Jun-200921:08Not applicable
Enablesetuid.iniNot applicable9210-Jun-200921:08Not applicable
Posix.exe6.1.7601.1751489,08820-Nov-201013:25x64
Psxdll.dll6.1.7601.22443330,24006-Sep-201302:28x64
Psxdllsvr.dll6.1.7601.22443378,36806-Sep-201302:28x64
Psxdrv.sys6.1.7600.1638510,24013-Jul-200923:35x64
Psxrun.exe6.1.7600.1638544,03214-Jul-200901:39x64
Psxss.exe6.1.7601.22443849,40806-Sep-201301:17x64
Suares.dll6.1.7600.163852,04814-Jul-200901:33x64
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For all supported IA-64-based versions of Windows Server 2008 R2
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File nameFile versionFile sizeDateTimePlatform
Baseu.dnlNot applicable16610-Jun-200921:13Not applicable
Baseu.prmNot applicable1,15310-Jun-200921:13Not applicable
Desktop.iniNot applicable8110-Jun-200921:13Not applicable
Disablesetuid.iniNot applicable9210-Jun-200921:13Not applicable
Download.urlNot applicable7110-Jun-200921:13Not applicable
Enablesetuid.iniNot applicable9210-Jun-200921:13Not applicable
Posix.exe6.1.7601.17514181,24820-Nov-201010:23IA-64
Psxdll.dll6.1.7601.22443718,84806-Sep-201301:36IA-64
Psxdllsvr.dll6.1.7601.22443744,44806-Sep-201301:36IA-64
Psxdrv.sys6.1.7600.1638523,55213-Jul-200923:40IA-64
Psxrun.exe6.1.7600.1638579,36014-Jul-200901:44IA-64
Psxss.exe6.1.7601.224431,649,66406-Sep-201300:49IA-64
Sua-ppdlic.xrm-msNot applicable2,98106-Sep-201301:55Not applicable
Suares.dll6.1.7600.163852,04814-Jul-200901:41IA-64
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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:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional file information

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

Additional files for all supported x86-based versions of Windows 7
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File propertyValue
File nameX86_8f180fc806ce0776b40c6a55db7bda2f_31bf3856ad364e35_6.1.7601.22443_none_826fe8f69fbb3ca1.manifest
File versionNot applicable
File size707
Date (UTC)06-Sep-2013
Time (UTC)17:13
PlatformNot applicable
File nameX86_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7601.22443_none_7657d3da6768ae7d.manifest
File versionNot applicable
File size62,446
Date (UTC)06-Sep-2013
Time (UTC)17:16
PlatformNot applicable
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Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
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File propertyValue
File nameAmd64_subsystem-for-unix-..d-applications-core_31bf3856ad364e35_6.1.7601.22443_none_52eb916bd0426351.manifest
File versionNot applicable
File size58,151
Date (UTC)06-Sep-2013
Time (UTC)17:19
PlatformNot applicable
File nameAmd64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7601.22443_none_d2766f5e1fc61fb3.manifest
File versionNot applicable
File size63,787
Date (UTC)06-Sep-2013
Time (UTC)17:19
PlatformNot applicable
File nameWow64_subsystem-for-unix-..d-applications-core_31bf3856ad364e35_6.1.7601.22443_none_5d403bbe04a3254c.manifest
File versionNot applicable
File size41,461
Date (UTC)06-Sep-2013
Time (UTC)02:20
PlatformNot applicable
File nameWow64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7601.22443_none_dccb19b05426e1ae.manifest
File versionNot applicable
File size41,411
Date (UTC)06-Sep-2013
Time (UTC)02:20
PlatformNot applicable
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Additional files for all supported IA-64-based versions of Windows Server 2008 R2
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File propertyValue
File nameIa64_6e245ed7577d701b71f6a5a803859bef_31bf3856ad364e35_6.1.7601.22443_none_73017e7a006c55f3.manifest
File versionNot applicable
File size1,062
Date (UTC)06-Sep-2013
Time (UTC)17:13
PlatformNot applicable
File nameIa64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7601.22443_none_765977d06766b779.manifest
File versionNot applicable
File size63,784
Date (UTC)06-Sep-2013
Time (UTC)17:13
PlatformNot applicable
File nameWow64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7601.22443_none_dccb19b05426e1ae.manifest
File versionNot applicable
File size41,411
Date (UTC)06-Sep-2013
Time (UTC)02:20
PlatformNot applicable
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Properties

Article ID: 2887519 - Last Review: October 9, 2013 - Revision: 1.0
Applies to
  • Windows 7 Enterprise
  • Windows 7 Professional
  • Windows 7 Ultimate
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 for Itanium-Based Systems
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
  • Windows Web Server 2008 R2
Keywords: 
kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseadvanced KB2887519

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