Hi Christopher,
Can you suggest stable tomcat and jvm versions.
Regards,
Devoss.
On 20 May 2014 21:32, "Christopher Schultz" <ch...@christopherschultz.net>
wrote:
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> Hash: SHA256
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> Devoss,
>
> On 5/19/14, 2:43 AM, devoss ind wrote:
> > Exact Tomcat version is 6.0.16
>
> This version of Tomcat is profoundly old: more than 6 years. There are
> documented and well-understood vulnerabilities in that (and later)
> versions of Tomcat 6.0.x that will allow unauthenticated remote
> attackers to subvert certain authentication mechanisms, mount XSS and
> CSRF attacks, and trivially launch non-distributed denial-of-service
> attacks against your server(s).
>
> Continued use of it is reckless to be polite. You absolutely
> positively need to upgrade immediately.
>
> > OS Version is RHEL Server release 5.3(Tikanga) Java version is
> > 1.6.0_10
>
> All that stuff is fairly old as well.
>
> Upgrade Tomcat and your JVM and re-test, please.
>
> - -chris
>
> > On Fri, May 16, 2014 at 9:15 PM, Christopher Schultz <
> > ch...@christopherschultz.net> wrote:
> >
> > devoss,
> >
> > Exact Tomcat version? OS and version? Java version?
> >
> > On 5/15/14, 12:00 PM, devoss ind wrote:
> >>>> On 7 May 2014 17:37, "devoss ind" <devoss....@gmail.com>
> >>>> wrote:
> >>>>>
> >>>>> Hi,
> >>>>>
> >>>>> Am using tomcat 6, java6 in production environment to run
> >>>>> our web
> >>>> application. We found that recently, cpu in top is showing
> >>>> 100% nearly. Then we dig into each thread cpu usage by -H
> >>>> option in top. We found only one thread is taking 100%usage
> >>>> and identified the thread using thread dump. The thread dump
> >>>> for that particular thread which is using 100% usage is as
> >>>> follows...
> >>>>>
> >>>>> "http-8080-exec-3687" daemon prio=10 tid=0x7336f400
> >>>>> nid=0x41a1 runnable
> >>>> [0x619ad000..0x619ade30]
> >>>>> java.lang.Thread.State: RUNNABLE at
> >>>>
> >
> org.apache.coyote.http11.InternalNioOutputBuffer.addToBB(InternalNioOutputBuffer.java:616)
> >>>>>
> >>>>
> >
> >
> - - locked <0x967b22f0> (a
> >>>> org.apache.coyote.http11.InternalNioOutputBuffer)
> >>>>> at
> >>>>
> >
> org.apache.coyote.http11.InternalNioOutputBuffer.commit(InternalNioOutputBuffer.java:608)
> >>>>>
> >>>>
> >
> >
> at
> >>>>
> >
> org.apache.coyote.http11.Http11NioProcessor.action(Http11NioProcessor.java:1024)
> >>>>>
> >>>>
> >
> >
> at org.apache.coyote.Response.action(Response.java:183)
> >>>>> at
> >>>>> org.apache.coyote.Response.sendHeaders(Response.java:379)
> >>>>> at
> >>>>
> org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:305)
> >>>>>
> >>>>
> >
> >>>>
> at
> >>>>
> org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:288)
> >>>>>
> >>>>
> >
> >>>>
> at
> >>>> org.apache.catalina.connector.Response.flushBuffer(Response.java:548)
> >>>>>
> >>>>
> >
> >>>>
> at
> >>>>
> >
> org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:345)
> >>>>>
> >>>>
> >
> >
> at
> >>>>
> >
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:144)
> >>>>>
> >>>>
> >
> >
> at
> >>>>
> >
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
> >>>>>
> >>>>
> >
> >
> at
> >>>>
> >
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
> >>>>>
> >>>>
> >
> >
> at
> >>>>
> >
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
> >>>>>
> >>>>
> >
> >
> at
> >>>>
> >
> org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:879)
> >>>>>
> >>>>
> >
> >
> at
> >>>>
> >
> org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:719)
> >>>>>
> >>>>
> >
> >
> at
> >>>>
> >
> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2080)
> >>>>>
> >>>>
> >
> >
> at
> >>>>
> >
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> >>>>>
> >>>>
> >
> >
> at
> >>>>
> >
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> >>>>>
> >>>>
> >
> >
> at java.lang.Thread.run(Thread.java:619)
> >>>>>
> >>>>> We can see that above thread is locked due to some problem
> >>>>> in NIO.
> >>>>>
> >>>>> We have verified in tomcat manager also for such thread. We
> >>>>> found that a
> >>>> particular thread is taking 14140517ms time and the request
> >>>> in that line is of POST request which is not related to our
> >>>> application.
> >>>>>
> >>>>> That particular thread is not releasing till we restart
> >>>>> tomcat.
> >>>>>
> >>>>> This is happening frequently.
> >>>>>
> >>>>> Please help me to find out the root cause of this problem.
> >>>>> How to avoid
> >>>> restarts.
> >>>>>
> >>>>> Our server.xml connector configuration is as follows...
> >>>>>
> >>>>> <Connector port="${http.port}"
> >>>> protocol="org.apache.coyote.http11.Http11NioProtocol"
> >>>>> connectionTimeout="5000" acceptCount="1500"
> >>>>> maxThreads="10000" redirectPort="8443" />
> >>>>>
> >>>>> Please help in this thread locking problem.
> >>>>>
> >>>>
> >>
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