FIX: The .NET Framework 2.0 Thread.IsThreadPoolThread property always returns a value of false, and the SQL Server 2005 Reporting Services log file grows uncontrollably

This article has been archived. It is offered "as is" and will no longer be updated.
In the Microsoft .NET Framework 2.0, the Thread.IsThreadPoolThread property always returns a value of false when the following conditions are true:
  • The first managed request is made to the ASP.NET worker process.
  • The thread is a common language runtime (CLR) thread.
This problem can cause an infinite loop in Microsoft SQL Server 2005 Reporting Services that will fill up the hard disk with log information. When a report is loaded, the report server log file immediately starts to grow uncontrollably. The log file continues to grow until it has consumed all the available disk space.

Note This problem does not occur in Microsoft SQL Server 2000 Reporting Services together with the Microsoft .NET Framework 1.1.
This problem occurs because SQL Server 2005 Reporting Services verifies the Thread.IsThreadPoolThread property on the thread. When the property has a value of false, Reporting Services will re-queue the work item on a thread pool thread.
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it 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 .NET Framework 2.0 service pack that contains this hotfix.

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


There are no prerequisites for this hotfix.

Restart information

You do not have to restart the computer after you apply this hotfix.

Registry information

You do not have to change the registry.

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.
File nameFile versionFile sizeDateTime
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information, 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
For more information about the Thread.IsThreadPoolThread property, visit the following Microsoft Developer Network (MSDN) Web site:

Article ID: 915088 - Last Review: 01/17/2015 13:32:12 - Revision: 2.0

Microsoft .NET Framework 2.0, Microsoft SQL Server 2005 Reporting Services

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