Found one Java-level deadlock:
=============================
"H2 Log Writer GRIDGAIN_INDEXES":
  waiting to lock monitor 0x5a7d30d4 (object 0x1b15b3a0, a org.h2.engine.Database),
  which is held by "gridgain-#143%cache.GridCacheReduceQueryMultithreadedSelfTest2%"
"gridgain-#143%cache.GridCacheReduceQueryMultithreadedSelfTest2%":
  waiting to lock monitor 0x5a7d313c (object 0x1b318920, a org.h2.engine.Session),
  which is held by "gridgain-#190%cache.GridCacheReduceQueryMultithreadedSelfTest2%"
"gridgain-#190%cache.GridCacheReduceQueryMultithreadedSelfTest2%":
  waiting to lock monitor 0x5a7d30d4 (object 0x1b15b3a0, a org.h2.engine.Database),
  which is held by "gridgain-#143%cache.GridCacheReduceQueryMultithreadedSelfTest2%"

Java stack information for the threads listed above:
===================================================
"H2 Log Writer GRIDGAIN_INDEXES":
	at org.h2.engine.Database.flush(Database.java:1695)
	- waiting to lock <0x1b15b3a0> (a org.h2.engine.Database)
	at org.h2.store.WriterThread.run(WriterThread.java:85)
	at java.lang.Thread.run(Thread.java:619)
"gridgain-#143%cache.GridCacheReduceQueryMultithreadedSelfTest2%":
	at org.h2.jdbc.JdbcPreparedStatement.execute(JdbcPreparedStatement.java:170)
	- waiting to lock <0x1b318920> (a org.h2.engine.Session)
	at org.h2.fulltext.FullText$FullTextTrigger.getWordIds(FullText.java:1024)
	at org.h2.fulltext.FullText$FullTextTrigger.insert(FullText.java:963)
	at org.h2.fulltext.FullText$FullTextTrigger.fire(FullText.java:929)
	at org.h2.schema.TriggerObject.fireRow(TriggerObject.java:203)
	at org.h2.table.Table.fireRow(Table.java:885)
	at org.h2.table.Table.fireAfterRow(Table.java:876)
	at org.h2.command.dml.Merge.merge(Merge.java:161)
	at org.h2.command.dml.Merge.update(Merge.java:104)
	at org.h2.command.CommandContainer.update(CommandContainer.java:71)
	at org.h2.command.Command.executeUpdate(Command.java:212)
	- locked <0x1b15b3a0> (a org.h2.engine.Database)
	at org.h2.jdbc.JdbcPreparedStatement.executeUpdateInternal(JdbcPreparedStatement.java:143)
	- locked <0x053b22e0> (a org.h2.engine.Session)
	at org.h2.jdbc.JdbcPreparedStatement.executeUpdate(JdbcPreparedStatement.java:129)
	at org.gridgain.grid.kernal.processors.cache.query.GridCacheQueryIndex.store(GridCacheQueryIndex.java:900)
	at org.gridgain.grid.kernal.processors.cache.query.GridCacheQueryManager.store(GridCacheQueryManager.java:153)
	at org.gridgain.grid.kernal.processors.cache.GridCacheMapEntry.updateIndex(GridCacheMapEntry.java:1714)
	- locked <0x053b2588> (a java.lang.Object)
	at org.gridgain.grid.kernal.processors.cache.GridCacheMapEntry.innerSet(GridCacheMapEntry.java:642)
	- locked <0x053b2588> (a java.lang.Object)
	at org.gridgain.grid.kernal.processors.cache.GridCacheTxLocalAdapter.userCommit(GridCacheTxLocalAdapter.java:516)
	at org.gridgain.grid.kernal.processors.cache.distributed.dht.GridDhtTxLocal.finish(GridDhtTxLocal.java:835)
	at org.gridgain.grid.kernal.processors.cache.distributed.dht.GridDhtTxLocal$4.apply(GridDhtTxLocal.java:1018)
	at org.gridgain.grid.kernal.processors.cache.distributed.dht.GridDhtTxLocal$4.apply(GridDhtTxLocal.java:1013)
	at org.gridgain.grid.util.future.GridFutureAdapter.notifyListener(GridFutureAdapter.java:391)
	at org.gridgain.grid.util.future.GridFutureAdapter.access$000(GridFutureAdapter.java:35)
	at org.gridgain.grid.util.future.GridFutureAdapter$1.run(GridFutureAdapter.java:319)
	at org.gridgain.grid.kernal.processors.closure.GridClosureProcessor$1.body(GridClosureProcessor.java:1164)
	at org.gridgain.grid.util.worker.GridWorker$1.run(GridWorker.java:145)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at org.gridgain.grid.util.worker.GridWorker.run(GridWorker.java:190)
	at org.gridgain.grid.util.worker.GridWorkerPool$1.run(GridWorkerPool.java:64)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)
"gridgain-#190%cache.GridCacheReduceQueryMultithreadedSelfTest2%":
	at org.h2.command.Command.executeQuery(Command.java:176)
	- waiting to lock <0x1b15b3a0> (a org.h2.engine.Database)
	at org.h2.jdbc.JdbcPreparedStatement.executeQuery(JdbcPreparedStatement.java:96)
	- locked <0x1b318920> (a org.h2.engine.Session)
	at org.gridgain.grid.kernal.processors.cache.query.GridCacheQueryIndex.querySql(GridCacheQueryIndex.java:1208)
	at org.gridgain.grid.kernal.processors.cache.query.GridCacheQueryManager.executeQuery(GridCacheQueryManager.java:261)
	at org.gridgain.grid.kernal.processors.cache.query.GridCacheQueryManager.runQuery(GridCacheQueryManager.java:364)
	at org.gridgain.grid.kernal.processors.cache.query.GridCacheDistributedQueryManager.processQueryRequest(GridCacheDistributedQueryManager.java:160)
	at org.gridgain.grid.kernal.processors.cache.query.GridCacheDistributedQueryManager.access$100(GridCacheDistributedQueryManager.java:37)
	at org.gridgain.grid.kernal.processors.cache.query.GridCacheDistributedQueryManager$2.apply(GridCacheDistributedQueryManager.java:82)
	at org.gridgain.grid.kernal.processors.cache.query.GridCacheDistributedQueryManager$2.apply(GridCacheDistributedQueryManager.java:80)
	at org.gridgain.grid.kernal.processors.cache.GridCacheIoManager.processUnordered(GridCacheIoManager.java:192)
	at org.gridgain.grid.kernal.processors.cache.GridCacheIoManager.access$400(GridCacheIoManager.java:36)
	at org.gridgain.grid.kernal.processors.cache.GridCacheIoManager$1.onMessage(GridCacheIoManager.java:113)
	at org.gridgain.grid.kernal.managers.communication.GridIoManager$GridFilteredMessageListener.onMessage(GridIoManager.java:1758)
	at org.gridgain.grid.kernal.managers.communication.GridIoManager$9.run(GridIoManager.java:623)
	at org.gridgain.grid.kernal.managers.communication.GridIoManager$10.body(GridIoManager.java:636)
	at org.gridgain.grid.util.worker.GridWorker$1.run(GridWorker.java:145)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at org.gridgain.grid.util.worker.GridWorker.run(GridWorker.java:190)
	at org.gridgain.grid.util.worker.GridWorkerPool$1.run(GridWorkerPool.java:64)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)

Found 1 deadlock.