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    <blockquote> <p>I'd like to figure out what causes it, or at the very least write a smaller reproduction to send into Microsoft, but I have no idea where to even begin.</p> </blockquote> <p>"Smaller reproduction" definitely sounds like a great idea here... even if "smaller" won't mean "quicker to reproduce".</p> <p>Before you even start, try to reproduce the error on another machine. If you can't reproduce it on another machine, that suggests a whole different set of tests to do - hardware, installation etc.</p> <p>Also, check you're on the latest version of everything. It would be annoying to spend days debugging this (which is likely, I'm afraid) and then end up with a response of "Yes, we know about this - it was a bug in .NET 4 which was fixed in .NET 4.5" for example. If you can reproduce it on a variety of framework versions, that would be even better :)</p> <p>Next, cut out everything you can in the program:</p> <ul> <li>Does it have a user interface at all? If possible, remove that.</li> <li>Does it use a database? See if you can remove all database access: definitely any output which isn't used later, and ideally input too. If you can hard code the input within the app, that would be ideal - but if not, files are simpler for reproductions than database access.</li> <li>Is it data-sensitive? Again, without knowing much about the app it's hard to know whether this is useful, but assuming it's processing a lot of data, can you use a binary search to find a relatively small amount of data which causes the problem?</li> <li>Does it <em>have</em> to be multi-threaded? If you can remove all the threading, obviously that may well then take much longer to reproduce the problem - but does it still happen at all?</li> <li>Try removing bits of business logic: if your app is componentized appropriately, you can probably fake out whole significant components by first creating a stub implementation, and then simply removing the calls.</li> </ul> <p>All of this will gradually reduce the size of the app until it's more manageable. At each step, you'll need to run the app again until it either crashes or you're convinced it won't crash. If you have a lot of machines available to you, that should help...</p>
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    1. POI've found a bug in the JIT/CLR - now how do I debug or reproduce it?
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    1. USJon Skeet
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    1. COJust an update: it appears [ponsfonze found my problem](http://stackoverflow.com/a/14001081/238419). And of course, it's an issue that was fixed in .Net 4.5... I should have listened to you!
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      1. USBlueRaja - Danny Pflughoeft
 

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