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Posted to dev@tomcat.apache.org by bu...@apache.org on 2021/06/20 18:05:33 UTC

[Bug 65392] New: Tomcat deadlocks under extreme system load

https://bz.apache.org/bugzilla/show_bug.cgi?id=65392

            Bug ID: 65392
           Summary: Tomcat deadlocks under extreme system load
           Product: Ant
           Version: 1.10.10
          Hardware: Sun
                OS: Solaris
            Status: NEW
          Severity: normal
          Priority: P1
         Component: .NET Antlib
          Assignee: notifications@ant.apache.org
          Reporter: arturoiam909@icloud.com
                CC: dev@tomcat.apache.org, peter.mezey@pss.boeing.com
        Depends on: 725
  Target Milestone: ---

+++ This bug was initially created as a clone of Bug #725 +++

Problem appears when a Verity search engine spider is launched against a 
document bundle consisting of approximately 5,000 jsp pages (each page has many 
links to the other pages in the bundle).  The use of actual jsp code is light.  
Each page only has a <jsp:include ... tag in it to get a consistent look and 
feel.  As the vspider program slams requests at Apache/Tomcat, you can watch
the 
memory usage slowly rise using "top".  Once it gets to about 170MB in SIZE, the 
system goes into a 100% iowait state and Tomcat no longer responds to any 
requests.  I have slowed the vspider down to use three request threads and to 
pause 2 seconds between each request.  At that rate, it can take from 30 - 60 
minutes or longer before this happens (that works out to roughly 2,700 - 5,400 
requests to Tomcat).  Sometimes, I will see a stack trace, but not always:

java.net.SocketException: Connection reset by peer: Connection reset by peer
        at java.net.SocketInputStream.socketRead(Native Method)
        at java.net.SocketInputStream.socketRead(Compiled Code)
        at java.net.SocketInputStream.read(Compiled Code)
        at 
org.apache.tomcat.service.connector.TcpConnector.receiveFully(Compiled Code)
        at org.apache.tomcat.service.connector.TcpConnector.receive(Compiled 
Code)
        at 
org.apache.tomcat.service.connector.Ajp13ConnectionHandler.processConnection(Com
piled Code)
        at org.apache.tomcat.service.TcpWorkerThread.runIt(Compiled Code)
        at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(Compiled Code)
        at java.lang.Thread.run(Compiled Code)

The platform we have is the following:

uname -a reports:
SunOS urnge 5.6 Generic_105181-20 sun4u sparc SUNW,Ultra-2

JDK version is 1.2.2_07 (I have the same problem with 1.3.0)
Apache version is 1.3.12
Tomcat version is 3.2.1
I am using ajp13 (I have the same problem with ajp12)
The ajp13 setup in server.xml looks like this:

<Connector className="org.apache.tomcat.service.PoolTcpConnector">
            <Parameter name="handler"
       value="org.apache.tomcat.service.connector.Ajp13ConnectionHandler"/>
            <Parameter name="port" value="8009"/>
            <Parameter name="max_threads" value="200"/>
            <Parameter name="max_spare_threads" value="50"/>
            <Parameter name="min_spare_threads" value="20"/>
        </Connector>

If there is any other information I can provide do not hesitate to ask.


Referenced Bugs:

https://bz.apache.org/bugzilla/show_bug.cgi?id=725
[Bug 725] Tomcat deadlocks under extreme system load
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[Bug 65392] Tomcat deadlocks under extreme system load

Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=65392

--- Comment #1 from Arturo Maci <ar...@icloud.com> ---
Created attachment 37909
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=37909&action=edit
I’m not dure if this fume even bongs gerer

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[Bug 65392] Tomcat deadlocks under extreme system load

Posted by bu...@apache.org.
https://bz.apache.org/bugzilla/show_bug.cgi?id=65392

--- Comment #2 from Michael Osipov <mi...@apache.org> ---
Is this report a joke?

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