FIX: An orphaned critical section may cause the ASP.NET worker process to stop responding

The Microsoft ASP.NET worker process stops responding. When you view the user dump file of the process, you notice that many threads are waiting for an mscorsvr critical section. The owner thread of the critical section is idle and the call stack is similar to the following:

0:031> kb
ChildEBP RetAddr Args to Child
1893ff50 77e83bd8 000000a4 1893ffa8 1893ff94 ntdll!ZwRemoveIoCompletion+0xb
1893ff7c 792343ac 000000a4 1893ffa4 1893ffa8 KERNEL32!GetQueuedCompletionStatus+0x27
1893ffb4 77e96523 00000000 000023d3 00000000 mscorsvr!DllCanUnloadNow
1893ffec 00000000 79234366 00000000 00000000 KERNEL32!BaseThreadStart+0x52

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 Microsoft .NET Framework 1.0 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.

The English version of this hotfix has the file attributes (or later) 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 tool in Control Panel.

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

For additional information about the terminology that is used to describe Microsoft product updates, click the following article number to view the article in the Microsoft Knowledge Base: