Thanks for the interest.
PDB files contain symbols for compiled objects. They assist Windows developer tools in triage. As described, that error could exist at many stages for a compiled program. To understand more, it would help to have a minimally necessary and sufficient reproducer from you that's appropriate for sharing in public. Can you provide something like that to the forums? A screen shot of where the error was encountered and system platform information can be useful as well.
This guide for reporting can be helpful: https://software.intel.com/en-us/articles/ocl-issue-reporting-guide