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POHow to debug nondeterministic access violation crash?
 

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  1. POHow to debug nondeterministic access violation crash?
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    <p>Our C#/COM/C++ application is crashing and I need help debugging it. Running with gflags enabled and WinDbg attached, we determined the crashes are caused by an access violation, but we haven't been able to narrow it down any more than that. We are not seeing the issue on all machines; there are a couple of machines that seem to reproduce the issue frequently but not deterministically. We have observed the application crash from simply switching away from the application (say, Alt-Tab) and then back. Output from WinDbg is below.</p> <p>We have been trying to systematically comment out areas of code that could be causing the problem, but we haven't had much success yet.</p> <p>Any suggestions on what debugging steps or tools we should try?</p> <blockquote> <p>!analyze -v</p> <p>EXCEPTION_RECORD: ffffffff -- (.exr 0xffffffffffffffff) ExceptionAddress: 1a584ff2 (+0x1a584ff1)<br> ExceptionCode: c0000005 (Access violation) ExceptionFlags: 00000000 NumberParameters: 2 Parameter[0]: 00000000 Parameter[1]: 1a584ff2 Attempt to read from address 1a584ff2</p> <p>PROCESS_NAME: ProcessFiles.exe</p> <p>ERROR_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s.</p> <p>EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s.</p> <p>EXCEPTION_PARAMETER1: 00000000</p> <p>EXCEPTION_PARAMETER2: 1a584ff2</p> <p>READ_ADDRESS: 1a584ff2 </p> <p>FOLLOWUP_IP: Ed20+1a584ff1 1a584ff2 ?? ???</p> <p>NTGLOBALFLAG: 2000000</p> <p>APPLICATION_VERIFIER_FLAGS: 0</p> <p>IP_MODULE_UNLOADED: Ed20+1a584ff1 1a584ff2 ?? ???</p> <p>MANAGED_STACK: (TransitionMU) 0EC6F6F4 7B1D8CCE System_Windows_Forms_ni!System.Windows.Forms.Application+ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32, Int32, Int32)+0x24e 0EC6F790 7B1D8937 System_Windows_Forms_ni!System.Windows.Forms.Application+ThreadContext.RunMessageLoopInner(Int32, System.Windows.Forms.ApplicationContext)+0x177 0EC6F7E4 7B1D8781 System_Windows_Forms_ni!System.Windows.Forms.Application+ThreadContext.RunMessageLoop(Int32, System.Windows.Forms.ApplicationContext)+0x61 0EC6F814 7B195911 System_Windows_Forms_ni!System.Windows.Forms.Application.Run(System.Windows.Forms.Form)+0x31 0EC6F828 0969D97A Extract_Utilities_Forms!Extract.Utilities.Forms.VerificationForm`1[[System.__Canon, mscorlib]].A(System.Object)+0x23a 0EC6F8C0 79A00EEE mscorlib_ni!System.Threading.ThreadHelper.ThreadStart_Context(System.Object)+0x72a25e 0EC6F8CC 792E019F mscorlib_ni!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)+0x6f 0EC6F8E4 797DB48A mscorlib_ni!System.Threading.ThreadHelper.ThreadStart(System.Object)+0x4a (TransitionUM)</p> <p>LAST_CONTROL_TRANSFER: from 7e418734 to 1a584ff2</p> <p>FAULTING_THREAD: ffffffff</p> <p>ADDITIONAL_DEBUG_TEXT: Followup set based on attribute [ip_not_executable] from Frame:[0] on thread:[e30]</p> <p>BUGCHECK_STR: APPLICATION_FAULT_BAD_INSTRUCTION_PTR_INVALID_POINTER_READ_WRONG_SYMBOLS_WINDOW_HOOK</p> <p>PRIMARY_PROBLEM_CLASS: BAD_INSTRUCTION_PTR</p> <p>DEFAULT_BUCKET_ID: BAD_INSTRUCTION_PTR</p> <p>STACK_TEXT: 7b1d8cce System_Windows_Forms_ni!System.Windows.Forms.Application+ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop+0xc 7b1d8937 System_Windows_Forms_ni!System.Windows.Forms.Application+ThreadContext.RunMessageLoopInner+0x0 7b1d8781 System_Windows_Forms_ni!System.Windows.Forms.Application+ThreadContext.RunMessageLoop+0x0 7b195911 System_Windows_Forms_ni!System.Windows.Forms.Application.Run+0x31 0969d97a Extract_Utilities_Forms!Extract.Utilities.Forms.VerificationForm`1[[System.__Canon, mscorlib]].A+0x23a 79a00eee mscorlib_ni!System.Threading.ThreadHelper.ThreadStart_Context+0x72a25e 792e019f mscorlib_ni!System.Threading.ExecutionContext.Run+0x6f 797db48a mscorlib_ni!System.Threading.ThreadHelper.ThreadStart+0x4a</p> <p>STACK_COMMAND: .ecxr ; ~~[e30] ; .frame 0 ; ** Pseudo Context ** ; kb</p> <p>FAILED_INSTRUCTION_ADDRESS: Ed20+1a584ff1 1a584ff2 ??<br> ???</p> <p>SYMBOL_NAME: Ed20</p> <p>FOLLOWUP_NAME: MachineOwner</p> <p>MODULE_NAME: Ed20</p> <p>IMAGE_NAME: Ed20</p> <p>DEBUG_FLR_IMAGE_TIMESTAMP: 0</p> <p>FAILURE_BUCKET_ID: BAD_INSTRUCTION_PTR_c0000005_Ed20!Unloaded</p> <p>BUCKET_ID: APPLICATION_FAULT_BAD_INSTRUCTION_PTR_INVALID_POINTER_READ_WRONG_SYMBOLS_WINDOW_HOOK_BAD_IP_Ed20</p> <p>Followup: MachineOwner</p> </blockquote>
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    1. USSpecial Touch
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    1. COHave you tried running attached to the debugger with first chance exception handling enabled? (Ctrl+Alt+E in Visual Studio).
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      1. POHow to debug nondeterministic access violation crash?
      1. USJames McNellis
    2. COYes, and what's strange is: we don't see anything. It only seems to be reproducible on a couple machines, not our development machines.
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      1. POHow to debug nondeterministic access violation crash?
      1. USSpecial Touch
    3. COThe heap is corrupted. You'll find good debugging hints in this thread: http://stackoverflow.com/questions/1010106/how-to-debug-heap-corruption-errors or by googling "how to debug heap corruption".
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      1. POHow to debug nondeterministic access violation crash?
      1. USHans Passant
 

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