[DO NOT MERGE] Throw exception if slot has invalid offset am: 69e347f7ef  -s ours am: 1c732801ab am: 78861ad53e  -s ours am: 13df27e68b am: a3912b6a1b am: 0766ba70c0
am: 46dbe6a7d0  -s ours

Change-Id: I23d0261d2b1704528a4ea49c59785c9e35419d2b