CUDA error message : unspecified launch failure

Question

This is part of my CUDA code. But last part of this code says some error message.

unsigned int *mat_count;
off_t *mat_position;
unsigned int *matches_count;
off_         


        

Answer 1

An unspecified launch failure is almost always a segfault. You've got an indexing mistake somewhere in your kernel, probably while accessing global memory.

I'd look through your code, but it's mildly incomprehensible...