[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

Change-Id: Iad3060ad58e0276c5125a54915f35e01eaa5babe