unspecified launch failure

Hi, I’m trying to run a simple ray tracer on a GTX 280, and when I increase the number of pixels being processed from 176x176 to 177x177 I receive an “unspecified launch failure” error.

I’m running 256 threads per block, and --ptax-options reports I’m using 38 registers per thread. What are the possibilities that could cause this error?

Thanks in advance for any help/information!

An “unspecified launch failure” is generally equivalent to a segfault on the CPU side. Compile in emulation and run your code through valgrind.