title: How to debug w3wp clr.dll error
body: <p>My client has an ASP.NET application installed on two production servers (balanced with NLB, but that's irrelevant).
  Both servers crash every 3-4 hours with the following event viewer logged error:</p>
  
  <blockquote>
    <p>Faulting application name: w3wp.exe, version: 7.5.7601.17514, time stamp: 0x4ce7afa2<br>
    Faulting module name: clr.dll, version:  4.0.30319.18034, time stamp: 0x50b5a783<br>
    Exception code: 0xc00000fd Fault offset: 0x000000000001a840<br>
    Faulting process id: 0xd50<br>
    Faulting application start time: 0x01ce97fe076d27b4<br>
    Faulting application path: c:\windows\system32\inetsrv\w3wp.exe<br>
    Faulting module path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll Report Id: e0c90a5f-0455-11e3-8f0e-005056891553  </p>
  </blockquote>
  
  <p>I have no idea how to debug or where to start. When the crash is about to happen the server processor usage jumps to 100% and stays there. The process at fault is w3wp.exe. I'm not even sure if my code is generating the error or not. It's IIS 7.5. Any pointers would be greatly appreciated.</p>