[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 am: 567e742daf
am: 5a16e06272

Change-Id: I314400073f43d720f74eac2e8f744b3768537f49