Great news that you were able to create the coredump.
Could you forward me the stacktrace via:
# launch cuda-gdb
cuda-gdb

# inside cuda-gdb
target cudacore file_name_of_coredump
bt

I don’t expect you to fix these issues, but it would be great if you could provide the corresponding code and, if possible, the coredump itself (it might be huge, so you might need to use e.g. Google Drive).
Inside the coredump you would be able to see the $pc as well as the last instructions, but to make sense of these you could need to be a bit familiar with the GPU machine instructions, so let’s focus on the backtrace first.