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    <p>This sounds like the error that I had when the Visual C++ 2008 Redistributable (msvcr90.dll) was not installed on the system. But first, please check (with Dependency Walker) that <code>httpd.exe</code> and <code>mod_wsgi.so</code> are using exactly the same <code>msvcr90.dll</code>:</p> <ul> <li>same name</li> <li>same directory</li> <li>same version</li> <li>same timestamp</li> </ul> <p>If they are using different DLL names (e.g. <code>msvcr90.dll</code> and <code>msvcr100.dll</code>) then you <strong>must</strong> recompile both with the same compiler (e.g. Visual Studio 2008).</p> <p>If they are using the same DLL name, but different versions or in different directories, then you might be having the same problem that I had, with BitNami DjangoStack.</p> <p>Because <code>msvcr90.dll</code> was not installed system-wide in <code>C:\Windows\WinSxS</code>, <code>httpd</code> was only able to run at all because there was an "xcopy deployment" of the side-by-side assembly in the same directory as httpd.exe:</p> <ul> <li><code>Microsoft.VC90.CRT.manifest</code></li> <li><code>msvcr90.dll</code></li> </ul> <p>If these files had not been present, it would have failed due to a missing dependency on <code>msvcr90.dll</code>, or else with this error:</p> <blockquote> <p>This application has failed to start because the application configuration is incorrect. Reinstalling the application may fix this problem.</p> </blockquote> <p>(i.e. the DLL was found but without a manifest to make it valid).</p> <p>Although <code>httpd.exe</code> runs this way, it is not able to reliably load a DLL that also uses <code>msvcr90.dll</code>:</p> <ul> <li>If the DLL has an "xcopy deployment" in its OWN directory, then it will load <strong>another</strong> copy of the DLL into the process (because it's a different copy of the DLL?). This results in a second heap in the process memory space, which can crash the process if memory is passed between the DLL and httpd (allocated by one and freed by the other). I think this is what you're seeing.</li> <li>If the DLL does <strong>not</strong> have an "xcopy deployment" in its own directory, then it will fail to load with a SideBySide or Windows Error Reporting error in the System event log.</li> </ul> <p>You can see more about this kind of problem on <a href="http://bugs.python.org/issue4120" rel="nofollow">Python bug 4120</a>, although this is not a clear, complete and definitive explanation of the problem, and I have not been able to find one yet.</p> <p>The only reliable way I found to run this stack was to install the <a href="http://www.microsoft.com/en-us/download/details.aspx?id=5555" rel="nofollow">Visual C++ 2008 redistributable</a> system-wide, which places a copy of <code>msvcr90.dll</code> in a subdirectory of <code>C:\Windows\WinSxS</code> along with a manifest to make it work.</p> <p>This should (I think) cause Windows to completely ignore the <code>Microsoft.VC90.CRT.manifest</code> and <code>msvcr90.dll</code> files in the application and DLL directories. Both should use the same DLL in <code>C:\Windows\WinSxS</code>, and it should only be loaded into the process once.</p>
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