I'm not sure how to go about debugging this. I have a C# program consisting entirely of managed code, running in .NET 4.5. After running it for a while, at some seemingly random time, I get a an error "An unhandled exception of type 'System.AccessViolationException' occurred in mscorlib.dll". Since I'm running it from Visual Studio (2012) I click "break" and am presented with the following call stack:
mscorlib.dll!System.Threading._IOCompletionCallback.PerformIOCompletionCallback(uint errorCode, uint numBytes, System.Threading.NativeOverlapped* pOVERLAP) + 0x47 bytes
[Native to Managed Transition]
ntdll.dll!_NtRequestWaitReplyPort@12() + 0xc bytes
kernel32.dll!_ConsoleClientCallServer@16() + 0x4f bytes
kernel32.dll!_GetConsoleLangId@4() + 0x2b bytes
kernel32.dll!_SetTEBLangID@0() + 0xf bytes
KernelBase.dll!_GetModuleHandleForUnicodeString@4() + 0x22 bytes
mdnsNSP.dll!7177aa48()
[Frames below may be incorrect and/or missing, no symbols loaded for mdnsNSP.dll]
mdnsNSP.dll!71775b06()
mdnsNSP.dll!71774ded()
mdnsNSP.dll!71774e8c()
bcryptprimitives.dll!746d1159()
bcryptprimitives.dll!746d1137()
ntdll.dll!_LdrpCallInitRoutine@16() + 0x14 bytes
ntdll.dll!_NtTestAlert@0() + 0xc bytes
ntdll.dll!_NtContinue@8() + 0xc bytes
ntdll.dll!_LdrInitializeThunk@8() + 0x1a bytes
An interesting thing I notice is that nothing in the call stack is my code.
What strategy would you advise I use to find the route of the problem? Or have you seen a problem similar to this and have any tips?
Since the exception doesn't seem to include my code, I don't know what information to include that would be helpful in answering the question, but ask me if there is anything else that I should include.
Since the error may be IO related (since PerformIOCompletionCallback is at the top of the stack), this is a list of typical IO tasks that this application performs:
- TcpListener