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POI've found a bug in the JIT/CLR - now how do I debug or reproduce it?
 

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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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    <p>I have a computationally-expensive multi-threaded C# app that seems to crash consistently after 30-90 minutes of running. The error it gives is</p> <blockquote> <p>The runtime has encountered a fatal error. The address of the error was at 0xec37ebae, on thread 0xbcc. The error code is 0xc0000005. This error may be a bug in the CLR or in the unsafe or non-verifiable portions of user code. Common sources of this bug include user marshaling errors for COM-interop or PInvoke, which may corrupt the stack.</p> </blockquote> <p><em>(0xc0000005 is the error-code for <a href="http://blogs.msdn.com/b/calvin_hsia/archive/2004/06/30/170344.aspx" rel="noreferrer">Access Violation</a>)</em></p> <p>My app does not invoke any native code, or use any unsafe blocks, or even any non-CLS compliant types like <code>uint</code>. In fact, the line of code that the debugger says caused the crash is</p> <pre><code>overallLength += distanceTravelled; </code></pre> <p>Where both values are of type <code>double</code></p> <hr> <p>Given all this, I believe the crash must be due to a bug in the compiler or CLR or JIT. 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. I've never had to view the CIL-binary, or the compiled JIT output, or the native stacktrace <em>(there is no managed stacktrace at the time of the crash)</em>, so I'm not sure how. I can't even figure out how to view the state of all the variables at the time of the crash <em>(VS unfortunately won't tell me like it does after managed-exceptions, and outputting them to console/a file would slow down the app 1000-fold, which is obviously not an option)</em>.</p> <p>So, <strong>how do I go about debugging this?</strong></p> <hr> <p><strong>[Edit]</strong> Compiled under VS 2010 SP1, running latest version of .Net 4.0 Client Profile. Apparently it's <em>".Net 4.0C/.Net 4.0E, .Net CLR 1.1.4322"</em></p>
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    1. USBlueRaja - Danny Pflughoeft
    1. USBlueRaja - Danny Pflughoeft
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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. COAre you sure it's not a memory problem on your computer? I have seen the same error code happen in other programs when a pointer gets corrupted and set to invalid memory locations.
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      1. POI've found a bug in the JIT/CLR - now how do I debug or reproduce it?
      1. USMatthew
    2. CO@Matthew: I will run some memory tests, and try to reproduce it on another machine. But I am doubtful - the program is not very memory-intensive, and I am not having any issues with any other program. Also, it always crashes on the same line.
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      1. POI've found a bug in the JIT/CLR - now how do I debug or reproduce it?
      1. USBlueRaja - Danny Pflughoeft
    3. COI'm not familiar with the CLR, but on the Sun JVM there's a flag that will log all methods that are compiled -- it might help if you can determine (1) whether the JIT was invoked, and (2) how long afterward the crash occurred. There's probably a tool that will let you inspect the memory map to find out what's loaded at that address (or even whether it's in a code block).
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      1. USparsifal
 

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