What do I do when my program crashes with exception 0xc0000005 at address 0

Question

My Delphi program runs as an NT service and has been running fine for more than 2 months and then it stops suddenly and generates a crash dump      Faulting application name  tca shctisvc ip exe  version  7 1 0 1843  time stamp  0x2a425e19 Faulting module name  unknown  version  0 0 0 0  time stamp  0x00000000 Exception code  0xc0000005 Fault offset  0x00000000     There were no real addresses to work from based on information in the Windows event log  I was able to load the mini dump into WinDbg and it said there was an exception but found problems with the stack frames  A different tool  Viewminidump  was able to show me stacks of the running threads   Where do I begin to resolve this issue

User · Answer

Exception code 0xc0000005 is an Access Violation   An AV at fault offset 0x00000000 means that something in your service s code is accessing a nil pointer   You will just have to debug the service while it is running to find out what it is accessing   If you cannot run it inside a debugger  then at least install a third-party exception logger framework  such as EurekaLog or MadExcept  to find out what your service was doing at the time of the AV

User · Answer

Problems with the stack frames could indicate stack corruption  a truely horrible beast   optimisation  or mixing frameworks such as C C   C  Delphi and other craziness as that - there is no absolute standard with respect to stack frames    Some languages do not even have them     So  I suggest getting slightly annoyed with the stack frame issues  ignoring it  and then just use Remy s answer

User · Answer

I was getting the same issue with a different application   Faulting application name  javaw exe  version  8 0 51 16  time stamp  0x55763d32 Faulting module name  mscorwks dll  version  2 0 50727 5485  time stamp  0x53a11d6c Exception code  0xc0000005 Fault offset  0x0000000000501090 Faulting process id  0x2960 Faulting application start time  0x01d0c39a93c695f2 Faulting application path  C  Program Files Java jre1 8 0 51 bin javaw exe Faulting module path C  Windows Microsoft NET Framework64 v2 0 50727 mscorwks dll   I was using the The Enhanced Mitigation Experience Toolkit  EMET  from Microsoft and I found by disabling the EMET features on javaw exe in my case as this was the faulting application  it enabled my application to run successfully   Make sure you don t have any similar software with security protections on memory

[delphi] What do I do when my program crashes with exception 0xc0000005 at address 0?

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