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From "Craig R. McClanahan" <craig...@apache.org>
Subject Re: Tomcat 402 Hanging after a few days
Date Fri, 08 Mar 2002 18:02:40 GMT


On Fri, 8 Mar 2002, [iso-8859-2] Jarecsni János wrote:

> Date: Fri, 8 Mar 2002 17:55:01 +0100
> From: "[iso-8859-2] Jarecsni János" <jarecsni.janos@chello.hu>
> Reply-To: Tomcat Users List <tomcat-user@jakarta.apache.org>
> To: Tomcat-User <tomcat-user@jakarta.apache.org>
> Subject: Tomcat 402 Hanging after a few days
>
> Hi,
>
> this week there were some postings regarding $subj. I filed a bug report
> this afternoon, after our tomcat hung again (it was last restarted on
> Monday). One of the Catalina processes dies so completely, that it cannot be
> killed with kill -9. Well so far I thought this can only happen on a
> windows... :)
>
> so check out this bug and vote for it:
> http://nagoya.apache.org/bugzilla/show_bug.cgi?id=6990
>

Voting for it won't do any good, if that is all that happens.

What will do some good is investigating far enough to create a
reproducible test case so that the cause can be understood, and therefore
dealt with.  Just to give you a feel for the range of possibilities, the
real problem could be in:
- The OS you are using
- The JVM you are using
- Native libraries you are using
- Tomcat
- Your webapp

Without some help in narrowing it down, there's not much any of the Tomcat
developers can do except mark such a bug as WORKSFORME (and it does - I've
seen and heard about Tomcat running many webapps for much longer periods
of time).

Note:  If "kill -9" doesn't work, then there's guaranteed to be an OS
problem -- it should not be possible to create an unkillable process.  But
that is undoubtedly not the whole story.

Note:  On a Linux box, Tomcat looks like a lot of processes, but it's not
-- those are really threads.  So doing a kill on one of the threads is not
going to bring the whole JVM down.  Do a "ps --forest" command to see
which is the parent PID.

> ciao,
> János
>

Craig


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