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    <p>You have managed heap corruption. It is not easy to find the root cause of the problem for managed heap corruption, because the problem usually demonstrates itself long after the heap is corrupted. In your case, the <code>StringBuilder</code> is a red herring. Corruption happened sometime before. </p> <p>What I would do is the following:</p> <ol> <li>Check if you have any unsafe C# code. If you have any, double check the logic there.</li> <li>Enable <a href="http://support.microsoft.com/kb/286470" rel="nofollow noreferrer">paged heap</a> for your application. Running it with paged heap will help uncover problems with unmanaged code -- in case unmanaged code is corrupting the managed heap. </li> <li>Run <code>!VerifyHeap</code> in different places. This way you might be able to localize the place in your code where corruption happens. </li> <li>If you have the server type of garbage collection enabled for your application, temporarily change that to workstation garbage collection -- you will get more predictable behavior this way.</li> <li>Read through Tesses' blog post <em><a href="http://blogs.msdn.com/b/tess/archive/2006/02/09/net-crash-managed-heap-corruption-calling-unmanaged-code.aspx" rel="nofollow noreferrer">.NET Crash: Managed Heap Corruption calling unmanaged code</a></em>. It demonstrates some examples of managed heap corruption. </li> </ol> <p>Note that when you will be running your code under WinDbg, you will come across occasional first chance AV. It is safe to ingore that, just type <code>sxd av</code> once you attach WinDbg to the process, and investigate only second chance AVs. </p>
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    1. POHow to debug corruption in the managed heap
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    1. USPeter Mortensen
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    1. COI have another crash stack after enabled paged heap, now it points to another code, could you please take a look. !VerifyHeap didn't give anything this time.
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    2. CO@net_prog, was this a second chance AV this time? You only need to look at second chance AVs for the heap corruption. If !VerifyHeap does not report any corruption, this means the heap is still fine, and you are hitting some other issue, not a heap corruption.
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    3. COI suppose it was a first chance: "(f24.103c): Access violation - code c0000005 (first chance)" and I didn't continue to see whether the program would exit, I just stopped the debugging. I will have to wait for another crash for details.
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