Locked table makes CMS unresponsive

Reproduced with Repository stampede test:
1) Checkout & build the Repository project
2) Go to the test folder and run:
mvn test -Dtest=StampedeTest -Pclusternode1 -Dstampede.minutes=1 -Dstampede.threads=5

java.sql.SQLException: Lock wait timeout exceeded; try restarting transaction
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:996)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2530)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1907)
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1199)
at org.apache.tomcat.dbcp.dbcp2.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:197)
at org.apache.tomcat.dbcp.dbcp2.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:197)
at org.apache.tomcat.dbcp.dbcp2.DelegatingPreparedStatement.execute(DelegatingPreparedStatement.java:197)
at org.apache.jackrabbit.core.util.db.ConnectionHelper.execute(ConnectionHelper.java:518)
at org.apache.jackrabbit.core.util.db.ConnectionHelper.reallyExec(ConnectionHelper.java:313)
at org.apache.jackrabbit.core.util.db.ConnectionHelper$1.call(ConnectionHelper.java:294)
at org.apache.jackrabbit.core.util.db.ConnectionHelper$1.call(ConnectionHelper.java:290)
at org.apache.jackrabbit.core.util.db.ConnectionHelper$RetryManager.doTry(ConnectionHelper.java:559)
at org.apache.jackrabbit.core.util.db.ConnectionHelper.exec(ConnectionHelper.java:290)
at org.apache.jackrabbit.core.journal.DatabaseJournal$DatabaseRevision.set(DatabaseJournal.java:834)
at org.apache.jackrabbit.core.cluster.ClusterNode.setRevision(ClusterNode.java:872)
at org.apache.jackrabbit.core.cluster.ClusterNode$WorkspaceUpdateChannel.updateCommitted(ClusterNode.java:703)
at org.hippoecm.repository.jackrabbit.HippoSharedItemStateManager$DocumentChangeNotifyingEventChannelDecorator.updateCommitted(HippoSharedItemStateManager.java:273)