title: Strange threads in application in Win7 WOW64
body: <p>We are observing <strong>4-6</strong> threads on Windows 7 x64 in the application which have <strong>3</strong> threads and behaves normally on any Windows (either 32 or 64 bit) prior Windows 7.</p>
  
  <p>Process Explorer shows the following "unknown" thread:</p>
  
  <pre><code>ntdll.dll!EtwDeliverDataBlock+offset
  </code></pre>
  
  <p>after random interval the following threads appear:</p>
  
  <pre><code>ntdll.dll!TpCallbackIndependent+offset
  ntdll.dll!TpCallbackIndependent+offset
  </code></pre>
  
  <p>after that application can't create thread (error code 8, hot enough space ...).</p>
  
  <p>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?</p>