Nsight 2.2 sometimes works sometimes doesn't - debugging

Question

I have problem about Parallel Nsight 2.2 debugger. It is very strange and I don't know how to describe it. Anyway, It works sometimes and sometimes doesn't.
What I observed is, that it works with dynamic array(this array has no effect on cuda_kernels or any other functon like cudaMemcpy atc...) named with 3 elements. And this is importnat... If I set size on 4+, it just falls down, no errors, nothing just fall down.
Interesting fact is, that if I run it normally via normal debugger hole program works correctly with right results. Also interesting fact is, that when set this array as static
unsigned topology[4];
and set in same values Nsight debugger works but very slowly.
So first of all I commented all cuda source code (like kernels and all cuda functions) but still same - it falls down. So I started to comment more host_code and I found loop (in host code) which does this creepy thing. So when program in Nsght-debug reach loop(under text) it falls down, BUT, when I write command in this loop to print number of each loop on screen, it runs, loop is finished, hole program is finished and then debugger told me:
Debug Assertion Failed!
Program:
File:f:\dd\vctools\crt_bld\self_x86\crt\src\dbgheap.c
Line: 1322
Expression: _CrtIsValidHeapPointer(pUserData)
.... I don't even have disk f ... so wtf???
Anyway, on normal debugger it runs fine and with right results.
This is mentioned loop and dynamic array *topology:
unsigned *topology;
unsigned numberOfLayersInput = 5;
topology = new unsigned [numberOfLayersInput];
topology[0] = 784;
topology[1] = 1000;
topology[2] = 800;
topology[3] = 300;
topology[4] = 10;
kernelTopology_ *topologyOfKernels;
topologyOfKernels = new kernelTopology_ [numberOfLayersInput - 1];
for (int i = 0, numberOfThreads; i < numberOfLayersInput; i++)
{
cout <<i << endl; // this is the added line!
numberOfThreads = fixedTopology[i];
topologyOfKernels[i].size = numberOfThreads;
if(numberOfThreads > THREADS_PER_BLOCK)
topologyOfKernels[i].BLOCK_SIZE = THREADS_PER_BLOCK;
else topologyOfKernels[i].BLOCK_SIZE = numberOfThreads;
if(numberOfThreads <= THREADS_PER_BLOCK)
topologyOfKernels[i].GRID_SIZE = 1;
else if(fixedTopology[i] % topologyOfKernels[i].BLOCK_SIZE == 0)
topologyOfKernels[i].GRID_SIZE = fixedTopology[i] / topologyOfKernels[i].BLOCK_SIZE;
else
topologyOfKernels[i].GRID_SIZE = (fixedTopology[i] / topologyOfKernels[i].BLOCK_SIZE) + 1;
}
I can't see any mistakes in this code... also normal debugger has no problem with it.
I have reinstalled graphics drivers, CUDA toolkit, CUDA SDK and Paralell Nsight but it does same creepy things. By the way I use Win 7 64 bit and VS2010.
Does have anyone any ideas what I should do with this?
Please, let me know if someone has any idea :)

Answer 1

The error
Debug Assertion Failed! Program: File:f:\dd\vctools\crt_bld\self_x86\crt\src\dbgheap.c Line: 1322
is from the Microsoft C runtime function _CrtIsValidHeapPointer. The default debug build adds additional heap and stack checks into the code. This function is used to verify that a specified pointer is in the local heap. The path f:... is the location of the source file in the C runtime. This function is at the time Microsoft built the library.
The assertion indicates an out of bounds memory access. The cause of the error appears to be incorrect allocation of topologyOfKernels.
corruption.topologyOfKernels = new kernelTopology_ [numberOfLayersInput - 1];
should be allocating numberofLayersInput elements.
corruption.topologyOfKernels = new kernelTopology_ [numberOfLayersInput];