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POVB.NET app giving memory exception 0xc0000005 in ntdll.dll
 

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    <p>I am having some issues with a memory access exception in a VB.NET application that I am working on. I was hoping to get some insight here as none of the research I've done has helped me track down the problem.</p> <p><strong>Background:</strong></p> <p>I am converting a number of applications from VB6 to .NET 4.0. At the request of the client, I am doing a straight conversion and only refactoring when necessary to avoid injecting other issues into the code as I convert. Most apps are being compiled in Any CPU mode, though a few have to be compiled as x86 because of reliance on 32-bit PLC software or older hardware drivers. My development machine is Windows 7 64-bit.</p> <p><strong>Issue:</strong></p> <p>After successfully converting two apps, the third application is crashing at random places in the code. The exception isn't caught and I have to look at the Looking at the event log I am seeing Exception code: 0xc0000005 on ntdll.dll, which I believe is a memory access exception. Since the application doesn't always crash in the same place, it is making it tough to track down. I have noticed that a lot of the errors occur during calls to ADODB (not always in the same place or on the same call), but it has also crashed on calls to form.ShowDialog(). </p> <p>The form where ShowDialog is being called writes some log information to the DB using ADODB. Though I haven't been able to confirm, I am guessing the exception within the form.ShowDialog() is happening during one of these ADODB calls. The crashing on the ADODB calls is happening in assemblies that are successfully being used in the other two apps that were converted and it doesn't consistently crash in the same place.</p> <p>In my research on this I have seen that bad interop can cause this issue. Wondering if the ADODB COM calls are somehow causing the issue in this app even though these calls are fine in the other apps.</p> <p>Some of the places I've observed calls that are apparently throwing this exception to the event log:</p> <ul> <li>newing an ADODB.recordset</li> <li>Creating a new parameter within a command.append</li> <li>connection.open calls</li> </ul> <p>Would anyone have any ideas how I can narrow this down to possibly trace the issue to its root cause? I appreciate any help or insight you can provide.</p>
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    1. COHave you ruled out the possibility that you are having hardware problems on your development computer?
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    2. COI haven't directly looked at hardware, but I did retest the previous app that uses these same calls and assemblies on this machine to make sure it didn't have any issues. Also, the code on this particular app isn't accessing the hardware directly. I will work on getting this running on another dev machine just to verify.
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    3. CODo you know what original OS version it ran on? Perhaps you might try running it in compatibility mode for that OS or at least try an older OS. Right click exe, Compatibility tab, check "Run this program in compatibility mode for" and select OS.
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      1. USGordon Glas
 

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