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Asked: 2026-05-16T20:19:36+00:00

I know that when an application crashes, the system reports that it crashed at

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I know that when an application crashes, the system reports that it crashed at location 0x00004b79 in mydll.dll. I have the source code, and I have the binary, but I don’t have a PDB or any listing files from the build of that DLL.

The crash is repeatable, but I can’t install a debugger on the production machine, and the crash does not occur in development or debugging environments. I have set up Dr. Watson, and I have a crash dump and Dr. Watson log file.

The Dr. Watson log file contains this disassembly for the function that was being executed:

        10604b70 8b442408         mov     eax,[esp+0x8]
        10604b74 8b542404         mov     edx,[esp+0x4]
        10604b78 50               push    eax
FAULT ->10604b79 8b4120           mov     eax,[ecx+0x20]    ds:0023:00000020=????????
        10604b7c 52               push    edx
        10604b7d 6801800000       push    0x8001
        10604b82 50               push    eax
        10604b83 ff156c946210 call dword ptr [mydll!DllUnregisterServer+0x1720c (1062946c)]
        10604b89 c20800           ret     0x8

(INT 3 instructions precede and succeed the assembly snippet above.)

The stack trace only includes the address mydll+0x4b79. It doesn’t give any caller information.

Loading up the crash dump in windbg didn’t provide any additional information.

How can I determine in what function (or even better, which line of code) the crash occurred?

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1 Answer

  1. Editorial Team

    Create a crash dump of your application and exmaine it using a debugger, WinDbg is the obvious choice here. A crash dump will give you a stack trace and detailed error information.

    Edit: As for not being able to install a debugger, DrWatson is preinstalled and able to generate crash dumps which can then be examined on a different machine.

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