org.jboss.test.jca.test.TxConnectionManagerStressTestCase creates too many threads

The exception is:

java.lang.OutOfMemoryError: unable to create new native thread
at java.lang.Thread.start0(Native Method)
at java.lang.Thread.start(Thread.java:597)
at org.jboss.test.jca.test.TxConnectionManagerStressTestCase.doBlocking(TxConnectionManagerStressTestCase.java:398)
at org.jboss.test.jca.test.TxConnectionManagerStressTestCase.testBlockingAggressiveRemovalAndFillTrackByTx(TxConnectionManagerStressTestCase.java:212)
at org.jboss.test.util.ejb.EJBTestCase.runBare(EJBTestCase.java:214)
at org.jboss.test.util.ejb.EJBTestRunnerBean.runTestCase(EJBTestRunnerBean.java:202)
at org.jboss.test.util.ejb.EJBTestRunnerBean.run(EJBTestRunnerBean.java:107)
at org.jboss.test.util.ejb.EJBTestRunnerBean.run(EJBTestRunnerBean.java:85)
at org.jboss.invocation.Invocation.performCall(Invocation.java:386)
at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:228)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:156)
at org.jboss.ejb.plugins.CallValidationInterceptor.invoke(CallValidationInterceptor.java:63)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:121)
at org.jboss.ejb.plugins.AbstractTxInterceptorBMT.invokeNext(AbstractTxInterceptorBMT.java:173)
at org.jboss.ejb.plugins.TxInterceptorBMT.invoke(TxInterceptorBMT.java:77)
at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:173)
at org.jboss.ejb.plugins.SecurityInterceptor.process(SecurityInterceptor.java:228)
at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:211)
at org.jboss.ejb.plugins.security.PreSecurityInterceptor.process(PreSecurityInterceptor.java:97)
at org.jboss.ejb.plugins.security.PreSecurityInterceptor.invoke(PreSecurityInterceptor.java:81)
at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:205)
at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:138)
at org.jboss.ejb.SessionContainer.internalInvoke(SessionContainer.java:650)
at org.jboss.ejb.Container.invoke(Container.java:1029)
at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:157)
at org.jboss.mx.server.Invocation.dispatch(Invocation.java:96)
at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:668)
at org.jboss.invocation.unified.server.UnifiedInvoker.invoke(UnifiedInvoker.java:232)
at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:891)
at org.jboss.remoting.transport.socket.ServerThread.completeInvocation(ServerThread.java:744)
at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:697)
at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:551)
at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:232)

It comes from the point where the doBlocking() method creates client threads for its tests... so perhaps it's just creating too many?