The test case below is based on one jck test case which fails on windows with -server on all version of JDK 6. I tried to initialize some classes before the "run" method and jit compiler will return the wrong result.

The licensee added a develop-only option in the VM which tries to eagerly initialize a class when compiling a methed. So they can reduce uncommon traps in generated code. Of course some jck cases will fail if the initialize order is important. But in this case, I don't think eagerly initializing a class should cause a problem. So I traced these eagerly initializing class and initialized them in java code. I tested my new case without the develop-only option and it failed again. So I think it's a bug of jit compiler and tested it on windows platform. I tested it against 6u12.

The test case does not fail on Solaris.

Source code:
/*
 * @(#)conv08301.java 1.8 01/12/07
 *
 * Copyright 2001 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */




import java.io.PrintStream;


interface SomeInterface {

int SEVENS = 777;

}


interface AnotherInterface {

int THIRDS = 33;

}


class SomeClass
implements SomeInterface {

int i;

SomeClass(int i) {
this.i = i;
}

}


class ImmediateSubclass
extends SomeClass
implements SomeInterface {

float f;

ImmediateSubclass(int i, float f) {
super(i);
this.f = f;
}

}


final class FinalSubclass
extends ImmediateSubclass
implements AnotherInterface {

double d;

  FinalSubclass(int i, float f, double d) {
super(i, f);
this.d = d;
}

}


public class conv08301 {

public static void main(String args[]) throws Exception{
/* try to pre initialize */
SomeClass[] a=new SomeClass[10];
Class.forName("ImmediateSubclass");
Class.forName("FinalSubclass");
System.exit(run(args, System.out) + 95/*STATUS_TEMP*/);
}
 
static int errorStatus = 0/*STATUS_PASSED*/;

static void errorAlert(PrintStream out, int errorLevel) {
out.println("conv08301: failure #" + errorLevel);
errorStatus = 2/*STATUS_FAILED*/;
}

public static int run(String args[],PrintStream out) {
int i [], j [];
SomeInterface u [], v[] [];
AnotherInterface w [];
SomeClass x [] [];

i = new int [10];
i[0] = 777;
j = (int []) i;
if (j != i)
errorAlert(out, 2);
else if (j.length != 10)
errorAlert(out, 3);
else if (j[0] != 777)
errorAlert(out, 4);

v = new SomeClass [3] [];
x = (SomeClass [] []) v;
if (! (x instanceof SomeInterface [] []))
errorAlert(out, 5);
else if (! (x instanceof SomeClass [] []))
errorAlert(out, 6);
else if (x != v)
errorAlert(out, 7);

x[0] = (SomeClass []) new ImmediateSubclass [4];
if (! (x[0] instanceof ImmediateSubclass []))
errorAlert(out, 8);
else if (x[0].length != 4)
errorAlert(out, 9);

x[1] = (SomeClass []) new FinalSubclass [4];
if (! (x[1] instanceof FinalSubclass []))
errorAlert(out, 10);
else if (x[1].length != 4)
errorAlert(out, 11);

w = (AnotherInterface []) x[1];
if (! (w instanceof FinalSubclass []))
errorAlert(out, 12);
else if (w != x[1])
errorAlert(out, 13);
else if (w.length != 4)
errorAlert(out, 14);

return errorStatus;
}

}

Steps to reproduce it (only reproduces on Windows)
JDK Version on Windows: 1.6.0_12
OS: Windows XP Professional
CPU: Intel Pentium M


> javac conv08301.java
> java -server conv08301
> java -server -Xcomp conv08301