On Mon, Aug 15, 2011 at 11:09 AM, Gunnar Lindroth
<gunnarlindr...@hotmail.com> wrote:
> Hi,
> I'm trying to run a Java application in my 64-bit UML. Unfortunately I have
> experienced a lot of SIGSEGV's when running my application which makes it
> next to unusable (it crashes maybe 80% of the time). The only way I have
> found to make the SIGSEGV's go away has been to disable the Java HotSpot
> compiler completely (running my application in interpreted mode).
> However, in interpreted mode I have observed other strange Java exception
> problems, which I have never seen when running my application outside the
> UML. After a lot of googling I have found a small test program ("Test.java")
> which can easily provoke the problem (at least when run in interpreted
> mode).
> The original test program can be found here:
> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4832371
>
> I have tried the test program on a few other hosts and OS:s (Linux, Windows
> and also VirtualBox and XEN Linux instances) but still haven't seen it fail
> outside the UML.
>
> My UML is running on Red Hat Enterprise Linux Server release 5.4 (Tikanga).
> uml-22-241>uname -a
> Linux uml-22-241 2.6.37 #1 Fri Apr 8 11:03:19 CEST 2011 x86_64 GNU/Linux
>
> The test program is started like this:
> uml-22-241>/rhel5.x86_64/java/jdk1.6.0_23/bin/java -cp /tmp/
> -Djava.compiler=NONE Test
>
>
> Here's the small test program, repeated for convenience:
> public class Test implements Runnable {
> int n;
> public Test(int i) {
> n = i;
> }
> public static void main(String args[]) {
> for (int i = 0; i < 100; i++) {
> Thread t = new Thread(new Test(i));
> t.start();
> }
> }
> public void run() {
> long i = 0;
> while (true) {
> Test2 test = new Test2();
> i++;
> if (i % 100000 == 0)
> System.out.print('.');
> }
> }
> }
> public class Test2 {
> float lf;
> public Test2() {
> this(11, 0.75f);
> }
> public Test2(int x, float f) {
> if (f <= 0 || Float.isNaN(f))
> System.out.println(f + " < 0 ");
> this.lf = f;
> }
> }
>
> Any help or suggestion about how to solve this problem is much appreciated!
Your test program runs fine within my x86_64 UML. (Debian 6, OpenJDK 1.6)
Is UML or java crashing by SIGEGV?
How much memory does your UML instance have?
--
Thanks,
//richard
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