JVM crash of openjdk6 on ubuntu 10.04 building jdk7

Hotspot crash.

#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x40d2d000, pid=13212, tid=1085074288
#
# JRE version: 6.0_20-b20
# Java VM: OpenJDK Client VM (19.0-b09 mixed mode linux-x86 )
# Derivative: IcedTea6 1.9.9
# Distribution: Ubuntu 10.04.1 LTS, package 6b20-1.9.9-0ubuntu1~10.04.2
# Problematic frame:
# J java.lang.Integer.stringSize(I)I
#
# If you would like to submit a bug report, please include
# instructions how to reproduce the bug and visit:
# https://bugs.launchpad.net/ubuntu/+source/openjdk-6/
#


Procedure to re-create is in the process of building openjdk7 with the openjdk6 as the boot from the Ubuntu distro.


#!/bin/bash

# Make sure system is up to date, ubuntu 32bit 10.04
#aptitude update
#aptitude install ssh openjdk-6-jdk expect mercurial ksh tcsh gawk g++ build-essential
#aptitude build-dep openjdk-6
#aptitude full-upgrade # Get 2.6.32-34

set -x
set -e

os="linux"
if [ "`uname -m`" = "i686" ] ; then
  arch="i586"
else
  arch="amd64"
fi

export LANG=C
export HOTSPOT_BUILD_JOBS=2
export ALT_PARALLEL_COMPILE_JOBS=2

mkdir -p ${HOME}/drops
cd ${HOME}/drops
if [ ! -f jdk7-jaxws2_2_4-b03-2011_05_27.zip ] ; then
  wget http://download.java.net/glassfish/components/jax-ws/openjdk/jdk7/jdk7-jaxws2_2_4-b03-2011_05_27.zip
fi
if [ ! -f jaxp145_01.zip ] ; then
  wget http://download.java.net/jaxp/1.4.5/jaxp145_01.zip
fi
if [ ! -f jdk7-jaf-2010_08_19.zip ] ; then
  wget http://java.net/downloads/jax-ws/JDK7/jdk7-jaf-2010_08_19.zip
fi
export ALT_DROPS_DIR=${HOME}/drops

mkdir -p ${HOME}/hgrepos
cd ${HOME}/hgrepos
if [ ! -d jdk7src/.hg ] ; then
  rm -f -r jdk7src
  hg clone http://hg.openjdk.java.net/jdk7/jdk7 jdk7src
fi
cd jdk7src
sh ./get_source.sh
sh ./get_source.sh

rm -f -r build
rm -f -r */build */dist */drop
make ALT_BOOTDIR=/usr/lib/jvm/java-6-openjdk sanity
make ALT_BOOTDIR=/usr/lib/jvm/java-6-openjdk

rm -f -r ${HOME}/jdk1.7.0
mv ./build/${os}-${arch}/j2sdk-image ${HOME}/jdk1.7.0
${HOME}/jdk1.7.0/bin/java -version
Not sure Oracle supports this. Perhaps a Community engineer will pick this up.