Bugs item #885053, was opened at 2004-01-26 22:07
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Category: JBossMQ
Group: v3.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Sebastian Hauer (hauer)
Assigned to: Nobody/Anonymous (nobody)
Summary: UIL2 thead leak during broken connection attempt
Initial Comment:
We noticed a thread leak in one of our production
environment running JBoss 3.0.8 with the UIL2 JMS layer.
I did a quick test on my machine where I am running
JBoss 3.2.2RC3 and the UIL2 JMS service is listening on
port 443. I tried connecting via a web browser to this
port which triggered as expected a:
java.io.StreamCorruptedException: Caught EOFException
while reading the stream header
at
java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:840)
at
java.io.ObjectInputStream.<init>(ObjectInputStream.java:163)
at
org.jboss.mq.il.uil2.SocketManager$ReadTask.run(SocketManager.java:265)
at java.lang.Thread.run(Thread.java:479)
I looked at the JBoss code and saw that once you open a
connection to the JMS server 2 threads get launched a
socked read thread UIL2.SocketManager.ReadTask# and
socket write thread UIL2.SocketManager.WriteTask# .
When the the mentioned exception happened the read
thread stops nicely yet the write thread keeped on running.
I verified this taking thread dumps on my local jboss
instance:
After the first broken JMS invocation I had:
8 read threads
9 write threads
After the second broken JMS invocation I had:
8 read threads
10 write threads
After the third broken JMS invocation I had:
8 read threads
11 write threads
....
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