JRockit 8.1 dumps on RH Linux AS 2.1, kernel v2.4.9-e.3smp

Question

Hi All,
I am using JRockit 8.1 SDK and it dumped on RH Linux AS 2.1, kernel v2.4.9-e.3smp.
The machine configuration is Xeon,3.06 GHZ Dual CPU with hyperthreading disable.
My program runs multiple threads and each of them tries to do Inet Address lookup.
I am suspecting that the Inet address lookup is the problem, the reason is that
the dump gives me following message in the Thread stack trace.
Thread Stack Trace:
at rniInet4AddressImplLookupAllHostAddr+385 (:0)@0x4027b01d
I was facing an Inet address lookup problem in multiple threads on JRockit's unsupported
linux version listed in below link, but the version I am using is supported by
JRockit.
http://edocs.bea.com/wljrockit/docs81/certif.html
Any help on this problem is highly appreciated.
Thanks,
Mitul

Answer 1

Cecilia,
Here is the attached test case which will help you to reproduce the problem.
I have tried to simulate my applications behaviour in this unit test, where it
tries to do the InetAddress lookup of localhost and remote host for creating a
socket. We have a highly multithreaded application ie. each thread tries to
do the lookup of remote and local host.
The important piece of data is that I have disabled a DNS cache at VM level by
changing java.security file in <JRockit Home>/jre/lib/security folder. Below
are the settings for that.
networkaddress.cache.ttl=0
networkaddress.cache.negative.ttl=0
You will also need to add policy in the java.policy file to allow the lookup to
happen, which is as below.
permission java.net.SocketPermission "*","resolve";
Once you are done with the above settings run below Command line to run unit test:
<jrockit_home>/bin/java InetLookupTest [host] [noOfThreads]
e.g.
<jrockit_home>/bin/java InetLookupTest www.bea.com 100
I can always reproduce the problem executing with above setup. I hope you will
also be able to reproduce it. I am hoping for the quick turn over to this problem.
My application strictly followes the same of nature of run. If we cannot get
the quick turnover to this problem we might have to think for another option.
BTW, I run this same unit test with Sun VM and it does not core dump.
Thanks,
Mitul
>
>
>
Ceilia,
I am attaching the context dump herewith. I hope you will find more
informations
out of it. Unfortunately, I will not be able to share the codebase
which reproduce
this. Have you ever seen such kind a behaviour before ? Any quick fix
to a problem
will be greately appreciated.
Thanks,
Mitul
"Cecilia Borg" <[email protected]> wrote:
Mitul,
It would be most helpful if you could send us the full JRockit context
dump.
Are you able to also provide us with a small test case?
Thanks, Cecilia
BEA WebLogic JRockit
Customer Centric Engineering
"Mitul Limbachiya" <[email protected]> wrote in message
news:[email protected]...
Hi All,
I am using JRockit 8.1 SDK and it dumped on RH Linux AS 2.1, kernelv2.4.9-e.3smp.
The machine configuration is Xeon,3.06 GHZ Dual CPU with hyperthreadingdisable.
My program runs multiple threads and each of them tries to do InetAddress lookup.
I am suspecting that the Inet address lookup is the problem, the
reason
is that
the dump gives me following message in the Thread stack trace.
Thread Stack Trace:
at rniInet4AddressImplLookupAllHostAddr+385 (:0)@0x4027b01d
I was facing an Inet address lookup problem in multiple threads onJRockit's unsupported
linux version listed in below link, but the version I am using issupported by
JRockit.
http://edocs.bea.com/wljrockit/docs81/certif.html
Any help on this problem is highly appreciated.
Thanks,
Mitul
[InetLookupTest.java]