Security tests using jdk/test/sun/security/krb5/auto/KDC.java fail intermittently with OutOfMemoryError.

Observed in mach5 on windows-amd64.

#section:main
----------messages:(3/229)----------
command: main -Dtest.security.protocol=TLS -Dtest.mode=krb TLSEnginesClosureTest
reason: User specified action: run main/othervm -Dtest.security.protocol=TLS -Dtest.mode=krb TLSEnginesClosureTest
elapsed time (seconds): 1.26
----------System.out:(41/1763)----------
Start KDC on 17611
KDC: add a principal 'USER@TEST.REALM' with 'password' password
KDC: add a principal 'krbtgt/TEST.REALM' with a random password
KDC: add a principal 'host/service.localhost@TEST.REALM' with a random password
KDC: create a new keytab file krb5.keytab.data
KDC: started on localhost:17611 with 'TEST.REALM' realm
============================================================
Supported kerberos ciphers testing
============================================================
------------------------------------------------------------
Testing cipher suite TLS_KRB5_WITH_3DES_EDE_CBC_SHA
------------------------------------------------------------
============================================================
Starting handshake INITIAL_HANDSHAKE
==============================================
Handshake loop 1
Client handshake status NEED_WRAP
Server handshake status NEED_UNWRAP
Client wrapped 138 bytes.
Client handshake status is NEED_UNWRAP
Server unwrapping 138 bytes...
Server handshake status is NEED_TASK
Running delegated tasks...
==============================================
Handshake loop 2
Client handshake status NEED_UNWRAP
Server handshake status NEED_WRAP
Server wrapped 94 bytes.
Server handshake status is NEED_UNWRAP
Client unwrapping 94 bytes...
Client handshake status is NEED_TASK
==============================================
Handshake loop 3
Client handshake status NEED_TASK
Server handshake status NEED_UNWRAP
Running delegated tasks...
-----------------------------------------------
>>>>> UDP packet received
TEST.REALM> USER@TEST.REALM sends AS-REQ for krbtgt/TEST.REALM@TEST.REALM, KDCOptions:
-----------------------------------------------
>>>>> TCP connection established
----------System.err:(3/158)----------
java.lang.OutOfMemoryError: Java heap space
at KDC$2.run(KDC.java:1282)
STATUS:Failed.`main' threw exception: java.lang.OutOfMemoryError: Java heap space