index_summary_upgrade_test.py is failing

'ERROR [SSTableBatchOpen:2] 2016-02-05 15:29:04,304 CassandraDaemon.java:195 - Exception in thread Thread[SSTableBatchOpen:2,5,main]\njava.lang.AssertionError: Illegal bounds [4..8); size: 4\n\tat org.apache.cassandra.io.util.Memory.checkBounds(Memory.java:339) ~[main/:na]\n\tat org.apache.cassandra.io.util.Memory.getInt(Memory.java:292) ~[main/:na]\n\tat org.apache.cassandra.io.sstable.IndexSummary.getPositionInSummary(IndexSummary.java:146) ~[main/:na]\n\tat org.apache.cassandra.io.sstable.IndexSummary.getKey(IndexSummary.java:151) ~[main/:na]\n\tat org.apache.cassandra.io.sstable.format.SSTableReader.validateSummarySamplingLevel(SSTableReader.java:928) ~[main/:na]\n\tat org.apache.cassandra.io.sstable.format.SSTableReader.load(SSTableReader.java:748) ~[main/:na]\n\tat org.apache.cassandra.io.sstable.format.SSTableReader.load(SSTableReader.java:705) ~[main/:na]\n\tat org.apache.cassandra.io.sstable.format.SSTableReader.open(SSTableReader.java:491) ~[main/:na]\n\tat org.apache.cassandra.io.sstable.format.SSTableReader.open(SSTableReader.java:374) ~[main/:na]\n\tat org.apache.cassandra.io.sstable.format.SSTableReader$4.run(SSTableReader.java:533) ~[main/:na]\n\tat java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[na:1.8.0_66]\n\tat java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[na:1.8.0_66]\n\tat java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_66]\n\tat java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_66]\n\tat java.lang.Thread.run(Thread.java:745) [na:1.8.0_66]']