JDK: 6u10 - 6u18
Platform: Solaris i586
This issue is reproducible on 
 
    zenit.russia.sun.com
    SunOS zenit 5.10 Generic_137112-07 i86pc i386 i86pc

Setting Nimbus L&f introduced in JDK6u10 as default L&F leads to JVM crash 
for almost any attempt to use Swing components. 
About a thousand of JCK Swing tests fails. 
Please see #6923313 for more details.

The issue could be reproduced as follows:

public class Test {
    public static void main(String[] args) {
	new javax.swing.JPanel();
        System.out.println("OK.");
    }
}

The program above if executed with 

 -Dswing.defaultlaf=com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel

on JDK6u10 - JDK6u18

will lead to 

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0xb5ca4181, pid=28234, tid=2
#
# JRE version: 6.0_18-b07
# Java VM: Java HotSpot(TM) Server VM (16.0-b13 mixed mode solaris-x86 )
# Problematic frame:
# C  [libfontconfig.so.1+0x24181]
#
# An error report file with more information is saved as:
# /home/db158260/temp/nimbus/hs_err_pid28234.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.
#