LeaveCriticalSection Error

I have attached a standalone test case, which, when run with the latest snapshot produces the following exception:

Exception in thread "main" com.hp.hpl.jena.shared.JenaException: leaveCriticalSection: No lock held (main) Thread R/W: 0/0 :: Model R/W: 0/0 (thread: main)
at com.hp.hpl.jena.shared.LockMRSW.leaveCriticalSection(LockMRSW.java:175)
at com.hp.hpl.jena.tdb.transaction.TransactionManager$TSM_WriteBackEndTxn.readerFinishes(TransactionManager.java:210)
at com.hp.hpl.jena.tdb.transaction.TransactionManager.readerFinishes(TransactionManager.java:723)
at com.hp.hpl.jena.tdb.transaction.TransactionManager.noteTxnAbort(TransactionManager.java:587)
at com.hp.hpl.jena.tdb.transaction.TransactionManager.notifyAbort(TransactionManager.java:445)
at com.hp.hpl.jena.tdb.transaction.Transaction.abort(Transaction.java:162)
at com.hp.hpl.jena.tdb.transaction.DatasetGraphTxn.abort(DatasetGraphTxn.java:45)
at com.hp.hpl.jena.tdb.transaction.DatasetGraphTransaction._abort(DatasetGraphTransaction.java:156)
at com.hp.hpl.jena.tdb.migrate.DatasetGraphTrackActive.abort(DatasetGraphTrackActive.java:68)
at com.hp.hpl.jena.sparql.core.DatasetImpl.abort(DatasetImpl.java:149)
at com.ibm.jena.test.LeaveCriticalSectionErrorTest.storeOperation(LeaveCriticalSectionErrorTest.java:57)
at com.ibm.jena.test.LeaveCriticalSectionErrorTest.query1(LeaveCriticalSectionErrorTest.java:105)
at com.ibm.jena.test.LeaveCriticalSectionErrorTest.main(LeaveCriticalSectionErrorTest.java:156)

The sequence in the test case is to run 2 queries, 1 write and then again 2 queries:

test.query1();
test.query1();
test.write1();
test.query1();
test.query1();

Somehow, the following sequence did not produce the exception:

test.query1();
test.query1();
test.write1();
test.query1();

Note that the test case does not check the correctness of any results.