Access violation error in OpenCL enqueueNDRangeKernel

Question

I try to launch at least empty kernel with a lot of parameters but I got memory access violation in function enqueueNDRangeKernel. Please check my code, maybe I missed something or just didn't know.

Host code: https://dl.dropboxusercontent.com/u/71256314/main.cpp At first goes some initialization, then I create buffers, then set arguments. No errors come out. It crashes on first enqueueNDRangeKernel function call.

Kernel code: https://dl.dropboxusercontent.com/u/71256314/baum_kernel.cl It doesn't work even though kernel is empty.

Some problems with buffers I guess, but no errors are returned.

Versions: AMD APP SDK v2.8 — AMD Catalyst™ 12.10 (9.002) GPU: ATI Mobility Radeon HD 5650

Answer 1

1) The problem was in line

err = kernel.setArg(11, Otr);   checkErr(err, "Kernel::setArg()11");

I was passing pointer to float Otr instead of passing the corresponding OpenCL buffer Otr_b to setArg function. OpenCL had been trying to copy the pointer to kernel which was expecting buffer. No doubt there was access violation error.

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2) Another important point mentioned by DarkZeros: check your library linking and also version correspondence between ATI driver and AMD APP SDK. Here is link where drivers and SDKs compatibility is listed: Versions of AMD APP SDK. I my case I had AMD APP SDK v2.8.1 which was not compatible with 12.10 (9.002) driver. I installed v2.8.0 version eventually.