Following JCK tests starts to fail starting from jdk 5u20 b04:

api/org_omg/PortableServer/POA/index.html#NetDistributed
api/org_omg/PortableInterceptor/ServerRequestInfo/index.html#SIMethods
api/org_omg/PortableInterceptor/ORBInitInfo/index.html#add
api/org_omg/PortableInterceptor/ServerRequestInterceptor/index.html#distributed
api/org_omg/PortableInterceptor/ClientRequestInterceptor/index.html#exception
api/org_omg/PortableInterceptor/ServerRequestInterceptor/index.html#exception
api/javax_rmi/CORBA/Util/copyObject.html#CopyObjTests0001
api/javax_rmi/CORBA/Util/copyObjects.html#CopyObjs0001
api/javax_rmi/CORBA/Util/registerTarget.html#RegTgt0001
api/javax_rmi/PortableRemoteObject/unexportObject.html#UnexportObject0001

Tests below just hangs due to the same reason:
api/org_omg/PortableServer/POA/index.html#fromTo
api/javax_rmi/PortableRemoteObject/narrow.html#Narrow0003
api/javax_rmi/PortableRemoteObject/toStub.html#ToStub0001
api/javax_rmi/PortableRemoteObject/toStub.html#ToStub0002
api/javax_rmi/CORBA/Util/unexportObject.html#UnexObj0002
api/javax_rmi/CORBA/Util/copyObject.html#CopyObjTests0001
api/javax_rmi/CORBA/Util/copyObjects.html#CopyObjs0001
api/javax_rmi/CORBA/Util/registerTarget.html#RegTgt0001
api/javax_rmi/PortableRemoteObject/connect.html#Connect0001

Possibly this failure is connected with CR 6763340.

Tests fails with the message like:

Aug 19, 2009 7:14:26 PM com.sun.corba.se.impl.oa.poa.POAImpl destroy
WARNING: "IOP01611002: (BAD_INV_ORDER) Request to wait for POA destruction while servicing request would deadlock"
org.omg.CORBA.BAD_INV_ORDER: vmcid: SUN minor code: 1002 completed: No
        at com.sun.corba.se.impl.logging.POASystemException.destroyDeadlock(POASystemException.java:98)
        at com.sun.corba.se.impl.logging.POASystemException.destroyDeadlock(POASystemException.java:120)
        at com.sun.corba.se.impl.oa.poa.POAImpl.destroy(POAImpl.java:942)
        at javasoft.sqe.jck.lib.CORBATest$1.run(CORBATest.java:113)
        at javasoft.sqe.jck.lib.SecurityTestRunner.runTestWithTCKSM(SecurityTestRunner.java:278)
        at javasoft.sqe.jck.lib.SecurityTestRunner.runTestWithPermissions(SecurityTestRunner.java:235)
        at javasoft.sqe.jck.lib.SecurityTestRunner.runTestWithAllPermissions(SecurityTestRunner.java:157)
        at javasoft.sqe.jck.lib.AllPermissionSM.testRun(AllPermissionSM.java:86)
        at javasoft.sqe.jck.lib.CORBATest.invokeTestCase(CORBATest.java:129)
        at javasoft.sqe.javatest.lib.MultiTest.run(MultiTest.java:195)
        at javasoft.sqe.jck.lib.CORBATest.run(CORBATest.java:69)
        at javasoft.sqe.javatest.lib.MultiTest.run(MultiTest.java:127)
        at javasoft.sqe.tests.api.org.omg.PortableInterceptor.ORBInitInfo.addTests.main(addTests.java:253)
Aug 19, 2009 7:14:29 PM com.sun.corba.se.impl.orb.ORBImpl shutdown
WARNING: "IOP01600003: (BAD_INV_ORDER) Operation would deadlock"
org.omg.CORBA.BAD_INV_ORDER: vmcid: OMG minor code: 3 completed: No
        at com.sun.corba.se.impl.logging.OMGSystemException.shutdownWaitForCompletionDeadlock(OMGSystemException.java:196)
        at com.sun.corba.se.impl.logging.OMGSystemException.shutdownWaitForCompletionDeadlock(OMGSystemException.java:218)
        at com.sun.corba.se.impl.orb.ORBImpl.shutdown(ORBImpl.java:1223)
        at javasoft.sqe.tests.api.org.omg.PortableInterceptor.ORBInitInfo.addTests.add0003(addTests.java:393)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:592)
        at javasoft.sqe.javatest.lib.MultiTest.invokeTestCase(MultiTest.java:399)
        at javasoft.sqe.jck.lib.CORBATest.access$001(CORBATest.java:43)
        at javasoft.sqe.jck.lib.CORBATest$1.run(CORBATest.java:100)
        at javasoft.sqe.jck.lib.SecurityTestRunner.runTestWithTCKSM(SecurityTestRunner.java:278)
        at javasoft.sqe.jck.lib.SecurityTestRunner.runTestWithPermissions(SecurityTestRunner.java:235)
        at javasoft.sqe.jck.lib.SecurityTestRunner.runTestWithAllPermissions(SecurityTestRunner.java:157)
        at javasoft.sqe.jck.lib.AllPermissionSM.testRun(AllPermissionSM.java:86)
        at javasoft.sqe.jck.lib.CORBATest.invokeTestCase(CORBATest.java:129)
        at javasoft.sqe.javatest.lib.MultiTest.run(MultiTest.java:195)
        at javasoft.sqe.jck.lib.CORBATest.run(CORBATest.java:69)
        at javasoft.sqe.javatest.lib.MultiTest.run(MultiTest.java:127)
        at javasoft.sqe.tests.api.org.omg.PortableInterceptor.ORBInitInfo.addTests.main(addTests.java:253)

Please see comments for more information. Please see jtr files attached.