1 Reply Latest reply on Jul 21, 2004 12:33 PM by ljoubert

Thread lock - unable to shutdown JBoss

ljoubert Jul 21, 2004 6:12 AM

Hello,

I am having the following problem on a Linux Red Hat system with kernel 2.4.21-9 and JVM 1.4.2_03.

My application is hanging for no particular reason, and JBoss is not returning any message back to the client. The server does not freeze and accept further requests normally.

When I do a thread dump on my JVM when the application hangs, this is what I get:

 at java.io.FileInputStream.readBytes(Native Method)
 at java.io.FileInputStream.read(FileInputStream.java:194)
 at java.io.BufferedInputStream.fill(BufferedInputStream.java:183)
 at java.io.BufferedInputStream.read1(BufferedInputStream.java:222)
 at java.io.BufferedInputStream.read(BufferedInputStream.java:277)
 - locked <0x9335e248> (a java.io.BufferedInputStream)
 at sun.security.provider.SeedGenerator$URLSeedGenerator.getSeedByte(SeedGenerator.java:467)
 at sun.security.provider.SeedGenerator.getSeedBytes(SeedGenerator.java:137)
 at sun.security.provider.SeedGenerator.generateSeed(SeedGenerator.java:132)
 at sun.security.provider.SecureRandom.engineGenerateSeed(SecureRandom.java:112)
 at sun.security.provider.SecureRandom.engineNextBytes(SecureRandom.java:169)
 - locked <0x9335e048> (a sun.security.provider.SecureRandom)
 at java.security.SecureRandom.nextBytes(SecureRandom.java:381)
 - locked <0x9335e000> (a java.security.SecureRandom)
 at java.security.SecureRandom.next(SecureRandom.java:403)
 at java.util.Random.nextInt(Random.java:191)
 at my.custom_application.common.util.UUIDGenerator.<init>(UUIDGenerator.java:54)

The locked file is /dev/random. I checked the permission on this dev file and everything looks ok. The weird part is that my application is working perfectly ok on another server, so I don't think that the source code is involved here.
What could be wrong with this device?

When I try to shutdown JBoss while the application hang, the JBoss server correctly receives the shutdown message and this is what I get in the log:

INFO [org.jboss.system.server.Server] Shutting down
INFO [org.jboss.system.server.Server] Shutting down the JVM now!

I dont have the usual

LifeThread.run exits!

and nothing happens after that. Packages are not undeployed etc...

Do you have any idea what might be happening on my server?

Thanks for your feedback,

Laurent

1. Re: Thread lock - unable to shutdown JBoss

ljoubert Jul 21, 2004 12:33 PM (in response to ljoubert)

I actually found a solution to my problem:
The bug was : http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=117218

The problem comes from entropy that fell to zero on the server and because of the bug above could not gain entropy again.

A patched red hat kernel should correct this problem. This has nothing to do with JBoss nor the JVM.

Laurent
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