Debugging seg-fault NVIDIA GPU

[ilaychen]

Hi,
I'm trying to debug a segmentation fault in a kernel on NVIDIA GPU.
How can I get memory details when accessing specific variable inorder to know what is the reason for the segmentation fault.
Thanks!

[jrprice]

Apologies for the slow reply. Is the segmentation fault when using Oclgrind, or when running your OpenCL kernel on the GPU? It's not clear from your message. If there is an out-of-bounds memory access, Oclgrind should automatically print details about where it is coming from.

[Nabushika]

I got the same thing - you might want to check that the cl::Event is not null, can debug with gdb - if you're getting a null pointer access in libopencl.so then the problem is that the kernel execution isn't happening properly. In my case this was because there were (silently ignored) errors when setting the arguments for the kernel.
Hope this helps!