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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=12475

CPU Usage is 0%, Tomcat doesn't response

           Summary: CPU Usage is 0%, Tomcat doesn't response
           Product: Tomcat 3
           Version: Unknown
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Connectors
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]


Hi!

We use tomcat 3.2.x and 3.3.x on Windows 2k and Linux. Sometimes (one time in 
one/two day(s) ) tomcat hangs up. Stack traces show that there is no our code 
in them, only tomcat's. Today I debugged hanged tomcat with the help of remote 
debug. I find out that there is no thread, which listen HTTP port (port from 
HttpConnectionHandler). There were two threads with the following on top: 
java.net.PlainSocketImpl.socketAccept(java.net.SocketImpl). But these threads 
listern ports from Ajp12ConnectionHandler and Ajp13ConnectionHandler. Besides 
two threads above and systems threads such as AWT-Threads, Finalizer and etc., 
there were many waiting threads with following stack:
                java.lang.Object.wait(long) line: not available [native method]
                org.apache.tomcat.util.threads.ThreadPool$ControlRunnable
(java.lang.Object).wait() line: 420
                org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run() 
line: 495
                java.lang.Thread.run() line: 484

Do you have an idea what's wrong with tomcat ? Why is it hanging up ?

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