I am getting the same error.
Fedora 17 64bit.
[david@ntb-ca-10 data-integration]$ ./spoon.sh
/home/david/desenvolvimento/etl/data-integration
DEBUG: _PENTAHO_JAVA_HOME=
DEBUG: _PENTAHO_JAVA=java
./../libswt/linux/x86_64/
.
java -Xmx3000m -XX:MaxPermSize=256m -Djava.library.path=./../libswt/linux/x86_64/ -DKETTLE_HOME= -DKETTLE_REPOSITORY= -DKETTLE_USER= -DKETTLE_PASSWORD= -DKETTLE_PLUGIN_PACKAGES= -DKETTLE_LOG_SIZE_LIMIT= -jar launcher/launcher.jar -lib ./../libswt/linux/x86_64/
Gtk-Message: Failed to load module "pk-gtk-module"
INFO 25-06 16:47:53,243 - Spoon - Logging goes to file:///tmp/spoon_a71b7284-befe-11e1-b4c3-19de06d8502e.log
#
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x0000000000000000, pid=13728, tid=140236236871424
#
# JRE version: 6.0_32-b05
# Java VM: Java HotSpot(TM) 64-Bit Server VM (20.7-b02 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C 0x0000000000000000 float+0xb4eaa000
#
# An error report file with more information is saved as:
# /home/david/desenvolvimento/etl/data-integration/hs_err_pid13728.log
#
# If you would like to submit a bug report, please visit:
#
http://java.sun.com/webapps/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
./spoon.sh: line 166: 13728 Aborted (core dumped) "$_PENTAHO_JAVA" $OPT $STARTUP -lib $LIBPATH "${1+$@}"
Tried with ORACLE JVM 1.6.32_b05.