Comment # 30 on bug 106258 from Michel Dänzer

I suspect there's an issue in amdgpu_vm_bo_split_mapping, e.g. this code looks
suspicious:

                if (pages_addr) {
                        uint64_t count;

                        max_entries = min(max_entries, 16ull * 1024ull);
                        for (count = 1; count < max_entries; ++count) {
                                uint64_t idx = pfn + count;

                                if (pages_addr[idx] !=
                                    (pages_addr[idx - 1] + PAGE_SIZE))
                                        break;
                        }

count is compared to max_entries, which is a number of GPU pages, but is also
added to pfn, which is a number of CPU pages.