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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 12475] - CPU Usage is 0%, Tomcat doesn't response
Date Tue, 08 Oct 2002 05:04:11 GMT
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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=12475

CPU Usage is 0%, Tomcat doesn't response





------- Additional Comments From zakharov@scph.mipt.ru  2002-10-08 05:04 -------
Our jars for Tomcat 3.3.1 have date: 07/12/2002.

The traces are not normal. There are several waiting threads and threse is _no_ 
listening thread. In my message I wrote that we saw two listening threads, but 
they listen Ajp12 and Ajp13 ports. We removed from server.xml Ajp12 and Ajp13 
and after that our server hung up without and listening thread and with several 
waiting threads. 

I found one more detail. When the server hung up I made dump with the help of 
jdb. I invoked the following commands: suspend and wherei all. A part from dump 
of hung server:
...
Thread-23:
MonitorRunnable:
  [1] java.lang.Object.wait (native method)
  [2] org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable.run 
(ThreadPool.java:407), pc = 11
  [3] java.lang.Thread.run (Thread.java:484), pc = 11
...
What is 'Thread-23:' ? Why is there no stack trace for this thread ? There are 
stack traces for 'Thread-22' and 'Theread-24, but there is no for 'Thread-23'.
I tried visual tools sush as IDEA and Eclipse, and I have similar result: there 
is a thread, which I can't suspend. I have no idea why this thread can't be 
suspended, but I always saw such thread, when our server hung up.

We tried to find bug in your source, but we aren't familiar with your code and 
we didn't find anything wrong. Now we run our server under Tomcat 4.0 and we 
don't have such hang-up....

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