Intermittent Unexpected Signal : 11

[pcool]

Hi all,

I am learning to use JBoss 3.2.1 and developed J2EE application ( with struts, JSPs, Servlets, some EJB 2.0 components ), and package the application into EAR. During startup, I encounter intermittent JVM crash, Unexpected Signal : 11. I tried this on Linux RedHat 8.0 and 9.0, and Solaris 8 SPARC, using Sun JDK 1.3.1_08.

I tried to put some JVM options ( -Xint -Xrs -Xms128M -Xmx256M ), but it didn't help.

Does anybody encounter the same problem? Is there anyway to solve this problem?

Thank you.

[juhalindfors]

You might be able to work around it by trying different bug fix releases of the JVM.

-- Juha

[pcool]

Hi Juha, thanks for your reply. Is it really the JVM bug? Could you please let me know which bug in particular? For the Linux env, I tried with Blackdown JDK and IBM JDK, all of them gave the same result. As for the Solaris env, I guess Sun JDK is the best to use. It is really difficult when I started the JBoss 10x, 6 of them crashed, but 4 of them were fine and the application run as expected.

[juhalindfors]

If a Java program is able to crash the JVM then it is usually a JVM bug (another alternative is that you might have some system libraries that are not working properly). I don't know which bug in particular. You also might want to try with and without HotSpot compiler, or try switching between the client and server versions of the HotSpot compiler.

-- Juha

[jonlee]

Most likely this is not a JVM bug since you are having such widespread problems. The Sig11 is being faulted by the underlying kernel. Usually, this is due to a hardware fault - generally memory related. There are exceptions. You can read this link for more information:
http://www.bitwizard.nl/sig11/

[jonlee]

Not sure why the Sparc system crashes though.

[pcool]

ok, thanks Juha. I thought so, after reading the sig11 article mentioned by jonlee ( I read that article jonlee, thanks anyway ), I thought there was some native libraries or hardware problem on my Linux machine, that's why I tried on Solaris 8 on SPARC machine. Alas, it gave me the same result.