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From "Olivier Fourel" <olivier.fou...@gmail.com>
Subject Tomcat 5.5 hanging & locked thread
Date Fri, 20 Jun 2008 08:37:20 GMT
Hello,

I have a tomcat 5.5 server hanging in production mode.
It seems we have threads that are never released and stay locked as shown in
the extract below.

I'm looking for help about tools or methods to identify what locks our
threads.


Our application log is ok, we tried to set it in trace mode but it doesn't
show more clue.


Olivier



Thread dump extract :

"http-8180-Processor300" daemon prio=10 tid=0x00002aaaf4eb4400 nid=0x1574 in
Object.wait() [0x000000005d7fe000..0x000000005d7fedc0]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x00002aaabbd271c0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
        at java.lang.Object.wait(Object.java:485)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:656)
        - locked <0x00002aaabbd271c0> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
        at java.lang.Thread.run(Thread.java:619)

"http-8180-Processor299" daemon prio=10 tid=0x00002aaaf4eb3000 nid=0x1573 in
Object.wait() [0x000000005d6fd000..0x000000005d6fdd40]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x00002aaabbd60838> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
        at java.lang.Object.wait(Object.java:485)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:656)
        - locked <0x00002aaabbd60838> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
        at java.lang.Thread.run(Thread.java:619)

"http-8180-Processor298" daemon prio=10 tid=0x00002aaaf4eb1800 nid=0x1572 in
Object.wait() [0x000000005d5fc000..0x000000005d5fccc0]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x00002aaabbd60c50> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
        at java.lang.Object.wait(Object.java:485)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:656)
        - locked <0x00002aaabbd60c50> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
        at java.lang.Thread.run(Thread.java:619)

"http-8180-Processor297" daemon prio=10 tid=0x00002aaaf4eb0400 nid=0x1571
runnable [0x000000005d4fb000..0x000000005d4fbc40]
   java.lang.Thread.State: RUNNABLE
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.read(SocketInputStream.java:129)
        at
org.apache.coyote.http11.InternalInputBuffer.fill(InternalInputBuffer.java:737)
        at
org.apache.coyote.http11.InternalInputBuffer.parseRequestLine(InternalInputBuffer.java:398)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:827)
        at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
        at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Thread.java:619)

"http-8180-Processor296" daemon prio=10 tid=0x00002aaaf4eaf000 nid=0x1570 in
Object.wait() [0x000000005d3fa000..0x000000005d3fabc0]
   java.lang.Thread.State: WAITING (on object monitor)
        at java.lang.Object.wait(Native Method)
        - waiting on <0x00002aaabbd61480> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
        at java.lang.Object.wait(Object.java:485)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:656)
        - locked <0x00002aaabbd61480> (a
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable)
        at java.lang.Thread.run(Thread.java:619)

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