Strange threads in application in Win7 WOW64

Posted by Shcheklein on Stack Overflow See other posts from Stack Overflow or by Shcheklein
Published on 2010-03-20T21:51:19Z Indexed on 2010/03/22 15:41 UTC
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windows-7

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ETW

We are observing 4-6 threads on Windows 7 x64 in the application which have 3 threads and behaves normally on any Windows (either 32 or 64 bit) prior Windows 7.

Process Explorer shows the following "unknown" thread:

ntdll.dll!EtwDeliverDataBlock+offset

after random interval the following threads appear:

ntdll.dll!TpCallbackIndependent+offset
ntdll.dll!TpCallbackIndependent+offset

after that application can't create thread (error code 8, hot enough space ...).

It seems to me that some system DLL creates ETW threads or something. Does anyone know what these threads for and how to manage them?

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