hadoop teragen generates - fatal error: caught unhandled signal 11 with zero JVM

I'm testing hadoop packages for armhf from http://launchpad.net/~hadoop-ubuntu/+archive/dev:

sudo add-apt-repository ppa:hadoop-ubuntu/dev
sudo apt-get update
sudo apt-get install hadoop-conf-pseudo

I've reconfigured my install to use zero (-server) by default by changing the order of JVM's in /etc/java-6-openjdk/jvm-armhf.cfg so that -server KNOWN is first in the list. This is important as JamVM current borkes the data in the install.

Then:

for i in namenode datanode tasktracker jobtracker secondarynamenode; do sudo start hadoop-$i; done

Following the instructions for running terasort benchmarking here - http://www.michael-noll.com/blog/2011/04/09/benchmarking-and-stress-testing-an-hadoop-cluster-with-terasort-testdfsio-nnbench-mrbench/#teragen-generate-the-terasort-input-data-if-needed (albiet with a 100G data set rather than 1TB).

When running:

hadoop jar /usr/share/hadoop/hadoop-examples-0.20.205.0.jar teragen 100000000 terasort-input

I get the following error sporadically from the JVM (tasks are re-run so it kind of recovers).

12/01/20 09:47:06 INFO mapred.JobClient: Task Id : attempt_201201200846_0004_m_000000_1, Status : FAILED
java.lang.Throwable: Child Error
        at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:271)
Caused by: java.io.IOException: Task process exit with nonzero status of 134.
        at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:258)

attempt_201201200846_0004_m_000000_1: #
attempt_201201200846_0004_m_000000_1: # A fatal error has been detected by the Java Runtime Environment:
attempt_201201200846_0004_m_000000_1: #
attempt_201201200846_0004_m_000000_1: # Internal Error (os_linux_zero.cpp:270), pid=19845, tid=2739610736
attempt_201201200846_0004_m_000000_1: # fatal error: caught unhandled signal 11
attempt_201201200846_0004_m_000000_1: #
attempt_201201200846_0004_m_000000_1: # JRE version: 6.0_24-b24
attempt_201201200846_0004_m_000000_1: # Java VM: OpenJDK Zero VM (20.0-b12 mixed mode linux-arm )
attempt_201201200846_0004_m_000000_1: # Derivative: IcedTea6 1.11pre
attempt_201201200846_0004_m_000000_1: # Distribution: Ubuntu precise (development branch), package 6b24~pre3-0ubuntu1
attempt_201201200846_0004_m_000000_1: # An error report file with more information is saved as:
attempt_201201200846_0004_m_000000_1: # /var/lib/hadoop/cache/mapred/mapred/local/taskTracker/jamespage/jobcache/job_201201200846_0004/attempt_201201200846_0004_m_000000_1/work/hs_err_pid19845.log
attempt_201201200846_0004_m_000000_1: #
attempt_201201200846_0004_m_000000_1: # If you would like to submit a bug report, please include
attempt_201201200846_0004_m_000000_1: # instructions how to reproduce the bug and visit:
attempt_201201200846_0004_m_000000_1: # https://bugs.launchpad.net/ubuntu/+source/openjdk-6/
attempt_201201200846_0004_m_000000_1: #

Unfortunately the hs_erro*.log is removed before I can grab it.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: openjdk-6-jre 6b24~pre3-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-1403.5-omap4 3.2.0-rc5
Uname: Linux 3.2.0-1403-omap4 armv7l
ApportVersion: 1.91-0ubuntu1
Architecture: armhf
Date: Fri Jan 20 10:48:29 2012
ProcEnviron:
 LANGUAGE=en_GB:
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: openjdk-6
UpgradeStatus: No upgrade log present (probably fresh install)