--- build ---
BUILD_OK
--- run ---
cac_leakage_table.entries = 0xfffffffffffffff8 (ZERO_LENGTH_PTR, non-NULL)
cac_leakage_table.count   = 0
idx (u16) after count-1   = 0xffff (65535)
wild read address = entries[0xFFFF] = 0x7fff0 -> low canonical (unmapped in kernel ctx) -> kernel page fault / panic
sizeof(union amdgpu_cac_leakage_entry)-based stride: 8 bytes
offset = 65535 * 8 = 524280 bytes past a ZERO_SIZE allocation