Applet based JTReg regression tests fail with exit code 128 on winxp prof sp1

Bug Info:
=========
test/javax/swing/JTabbedPane/6416920/bug6416920.java fails with exit code 128 on winxp prof sp1
It fails only on sp1 machines and it passes with sp2 machines.

I don't think so whether sp1 is not a supported platform.Even i didn't get any information saying that sp1 is not supported platform for 6.0 but while installing jdk build in winxp sp1 machine i found a warning dialog saying that not supported platfrom.

I executed the suite with local setup also.But I didn't see any changes in the issue.

Before file this bug i had a conversation with developers and they tried out different ways to find the solution to resolve but still there is no solution.

Please see comments section where you can see the conversation happened between the developers and jdk team.

JDK Info:
=========
java version "1.6.0-beta2"
Java(TM) SE Runtime Environment (build 1.6.0-beta2-b85)
Java HotSpot(TM) Client VM (build 1.6.0-beta2-b85, mixed mode, sharing)

Even still the problem can reproducible with latest jdk build also.

Steps to reproduce:
===================
1. set the JAVA_HOME environment.
2. set the JT_HOME ennvironment.
3. set the SUITE_DIR environment (${SWING_REG_WS}/test/javax/swing/JTabbedPane/6416920/bug6416920.java)
4. jtreg -r:/temp -w:/temp ${SUITE_DIR}