JNLP Appln crashes on RHAS4.0/Cinnabar when DumpThreadStack (key "v") is pressed on java console

JDK-Info:
---------
java version "1.6.0-ea"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-ea-b57)
Java HotSpot(TM) Client VM (build 1.6.0-ea-b57, mixed mode)


Tested on:
----------
RHAS4.0/GNOME
Cinnabar/GNOME


Steps to Reproduce:
-------------------
1) Install jre b57
2) Clean cache (\rm -rf ~/.java)
3) Enable Show Java Console
JCP --> Advanced tab --> Java console --> Check "Show console"
4) Save the changes and exit JCP
5) Launch a JNLP application (./javaws http://java.sun.com/products/javawebstart/apps/mg.jnlp)

When application is launched, on the Java console, clear console by
pressing "c" and then press "v" to DumpThreadStack; repeat pressing c and v for a couple of times (appln crashed after the 2nd/3rd time click of c and v, when i tried for around 7 times repeating steps 1-5)


Behavior as seen on RHAS4.0/GNOME:
----------------------------------
The following error was thrown and the JNLP Applicaion crashes!

-bash-3.00# *** glibc detected *** double free or corruption (!prev): 0x083cc6d8
***


Behavior as seen on Cinnabar/Gnome:
----------------------------------
jlab419:/1.6.0/bin # \rm -rf ~/.java
jlab419:/1.6.0/bin # ./ControlPanel
jlab419:/1.6.0/bin # ./javaws http://java.sun.com/products/javawebstart/apps/mg.jnlp
jlab419:/1.6.0/bin #
#
# An unexpected error has been detected by HotSpot Virtual Machine:
#
# SIGSEGV (0xb) at pc=0x4009ae27, pid=26265, tid=1254673328
#
# Java VM: Java HotSpot(TM) Client VM (1.6.0-ea-b57 mixed mode)
# Problematic frame:
# C [libc.so.6+0x61e27]
#
# An error report file with more information is saved as /tmp/hs_err_pid26265.log
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#

jlab419:/1.6.0/bin #

Error report file hs_err_pid26265.log attached