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POHow to debug / mitigate uncatchable exceptions
 

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  1. POHow to debug / mitigate uncatchable exceptions
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    <p>So, for a project I have to use the notoriously error prone GDAL (<a href="http://www.gdal.org/" rel="nofollow">http://www.gdal.org/</a>) library written in unmanaged C++ (actually I'm using the C# bindings). The problem is sometimes the library bombs and crashes the vhost32.exe process. There is nothing I can do about that. Empty catch blocks won't do me no good, the AppDomain.CurrentDomain.UnhandledException isn't even raised.</p> <p>The exception thrown is </p> <blockquote> <p>Unhandled exception at 0x77B9AA3C (ntdll.dll) in RASTER.exe: 0xC0000374: A heap has been corrupted (parameters: 0x77BAFE38).</p> </blockquote> <p>So obviously this exception is unrecoverable and Windows shuts down my process. So far so good. Now the problem is, where to I go from here? I don't want the whole process to be killed just because a call to a buggy library fails. What are my options? Spawning a second process and using named pipes for inter-process communication? That would still mean that the <em>other</em> process crashes with that "Windows is checking for a solution to the problem..." popup. Not good. Unfortunately, for the functionality I need there is no alternative to that library.</p> <pre><code>&lt;gcConcurrent enabled="false" /&gt; &lt;legacyCorruptedStateExceptionsPolicy enabled="true" /&gt; </code></pre> <p>in my App.config doesn't change a thing. Neither does decorating the method that bombs with the <code>[HandleProcessCorruptedStateExceptions]</code> attribute.</p> <p>Is there anything I can do?</p>
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    1. COCan you catch this failure with SetUnhandledExceptionFilter in a native process? If yes, use two processes solution.
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      1. POHow to debug / mitigate uncatchable exceptions
      1. USAlex F
    2. COthe problem is my C++ skills are .. well .. not existent ...
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      1. POHow to debug / mitigate uncatchable exceptions
      1. USlightxx
    3. COLook at this article: http://www.codeproject.com/Articles/154686/SetUnhandledExceptionFilter-and-the-C-C-Runtime-Li First two code fragments are what you need for the test. Replace `*p = 5;` with GDAL call that crashes the process. Add `TerminateProcess(GetCurrentProcess(), 0);` to `OurCrashHandler` If program exits without any Windows messages, you can use two processes solution. Second process must be native C++ process, so you need to know C++ to do this...
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      1. POHow to debug / mitigate uncatchable exceptions
      1. USAlex F
 

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