HelloMedia and Ensemble (once executed media sample) are unstable on Linux. Here is a crash log of Ensemble executed media right before exit.

#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0xb6dee762, pid=26213, tid=1762556784
#
# JRE version: 6.0_30-b12
# Java VM: Java HotSpot(TM) Server VM (20.5-b03 mixed mode linux-x86 )
# Problematic frame:
# V [libjvm.so+0x3ef762] unsigned+0x52
#
# An error report file with more information is saved as:
# /home/cyang/java/javafx/210/jfx/apps/ga-samples/Ensemble/hs_err_pid26213.log
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#
Aborted