The SUA application stops responding when you run a mixed-mode SUA application that calls the fork function on a computer that is running Windows 7 or Windows Server 2008 R2

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Article ID: 978048 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:
  • You have a computer that is running Windows 7 or Windows Server 2008 R2.
  • The Subsystem for UNIX-based Applications (SUA) feature is installed on the computer.
  • You run a mixed-mode SUA application.
  • The SUA application calls the fork function to create a new child process.
In this scenario, the SUA application stops responding.

Note A mixed-mode SUA application can use native Windows libraries.

CAUSE

This problem occurs because of a problem in the SUA feature. After a SUA process and its primary thread are created, the primary thread creates a dedicated signal thread for the SUA process. When the signal thread is being created, the primary thread contacts the Psxss.exe process to pass on some data. However, certain handles that are required to start the signal thread are overwritten when the primary thread contacts the Psxss.exe 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=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, your computer must be running Windows 7 or Windows Server 2008 R2. Additionally, the SUA feature must be installed on the computer.

Registry information

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

Restart requirement

You do not 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 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 of these 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 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
Collapse this tableExpand this table
File nameFile versionFile sizeDateTime
Psxdll.dll6.1.7600.20585309,24830-Nov-200907:33
Psxdllsvr.dll6.1.7600.20585357,88830-Nov-200907:33
Psxss.exe6.1.7600.20585656,38430-Nov-200907:31
Sua-ppdlic.xrm-msNot applicable2,98130-Nov-200907:42
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Psxdll.dll6.1.7600.20585330,24030-Nov-200912:26x64
Psxdllsvr.dll6.1.7600.20585378,36830-Nov-200912:26x64
Psxss.exe6.1.7600.20585849,40830-Nov-200912:25x64
Suacore-ppdlic.xrm-msNot applicable2,99330-Nov-200912:34Not applicable
Sua-ppdlic.xrm-msNot applicable2,98130-Nov-200912:34Not applicable
Posixsscom.dll6.1.7600.205855,63230-Nov-200907:33x86
Psxdll.dll6.1.7600.20585328,19230-Nov-200907:33x86
Psxdllsvr.dll6.1.7600.20585376,83230-Nov-200907:33x86
For all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Psxdll.dll6.1.7600.20585718,84830-Nov-200906:42IA-64
Psxdllsvr.dll6.1.7600.20585744,44830-Nov-200906:42IA-64
Psxss.exe6.1.7600.205851,648,12830-Nov-200906:37IA-64
Sua-ppdlic.xrm-msNot applicable2,98130-Nov-200906:51Not applicable
Posixsscom.dll6.1.7600.205855,63230-Nov-200907:33x86
Psxdll.dll6.1.7600.20585328,19230-Nov-200907:33x86
Psxdllsvr.dll6.1.7600.20585376,83230-Nov-200907:33x86

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

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

Additional files for all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File nameX86_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7600.20585_none_74484c9a6a60ce3b.manifest
File versionNot applicable
File size62,446
Date (UTC)01-Dec-2009
Time (UTC)01:33
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameAmd64_subsystem-for-unix-..d-applications-core_31bf3856ad364e35_6.1.7600.20585_none_50dc0a2bd33a830f.manifest
File versionNot applicable
File size58,151
Date (UTC)01-Dec-2009
Time (UTC)01:35
File nameAmd64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7600.20585_none_d066e81e22be3f71.manifest
File versionNot applicable
File size63,787
Date (UTC)01-Dec-2009
Time (UTC)01:35
File nameWow64_subsystem-for-unix-..d-applications-core_31bf3856ad364e35_6.1.7600.20585_none_5b30b47e079b450a.manifest
File versionNot applicable
File size41,461
Date (UTC)30-Nov-2009
Time (UTC)14:50
File nameWow64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7600.20585_none_dabb9270571f016c.manifest
File versionNot applicable
File size41,411
Date (UTC)30-Nov-2009
Time (UTC)14:50
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameIa64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7600.20585_none_7449f0906a5ed737.manifest
File versionNot applicable
File size63,784
Date (UTC)01-Dec-2009
Time (UTC)01:31
File nameWow64_subsystem-for-unix-based-applications_31bf3856ad364e35_6.1.7600.20585_none_dabb9270571f016c.manifest
File versionNot Applicable
File size41,411
Date (UTC)30-Nov-2009
Time (UTC)14:50

Properties

Article ID: 978048 - Last Review: December 29, 2009 - Revision: 1.1
APPLIES TO
  • Windows 7 Enterprise
  • Windows 7 Ultimate
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Standard
Keywords: 
kbautohotfix kbfix kbqfe kbexpertiseadvanced kbsurveynew kbhotfixserver KB978048

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