From rsanka@usa.net  Tue Jan  2 16:16:11 2001
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Date:  2 Jan 01 11:16:08 EST
From: RAMAKRISHNA SANKA <rsanka@usa.net>
To: tomcat-user@jakarta.apache.org
Subject: Repost of problem: tomcat hangs with sockets on CLOSE_WAIT when user cancels request
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Hi All,
I am running Tomcat 3.1 in stand-alone mode on AIX 4.3.3 using
IBM JDK1.2. My servlets connect to an Oracle database and
forward to a jsp to display the results. Of late I have had
flaky behaviour from this operation.

Problem 1.
Every now and this request causes a SIGSEGV and core dump.
=3D=3D=3D=3D=3D=3D=3D=3D=3D BEGIN excerpt from javacore... =3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D
SIGSEGV received at 2 in . Processing terminated.
    "Thread-56" (TID:0x800323b0, sys_thread_t:0x308ec430, state:R, native=

ID:0xc41) prio=3D5
        at java.io.BufferedWriter.<init>(BufferedWriter.java:96)
        at java.io.BufferedWriter.<init>(BufferedWriter.java:79)
        at java.io.PrintWriter.<init>(PrintWriter.java:112)
        at
org.apache.jasper.runtime.JspServlet.unknownException(JspServlet.java:268=
)
        at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:3=
77)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java(C=
ompiled
Cod
e))
        at
org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)
        at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(Ht=
tpConnectio
nHandler.java:160)
        at
org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:=
338)
        at java.lang.Thread.run(Thread.java:481)

         ----- Native Stack -----
        unavailable - iar 2 not in text area
-------------------------------------------------------------------------=

J2RE 1.2.2 IBM build ca122-19991217

=3D=3D=3D=3D=3D=3D=3D=3D=3D End excerpt from javacore ... =3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D

Problem 2.
This request takes too long. I click the stop button on the
Netscape browser and it just sits there waiting. I check on =

the server and 'netstat -a | grep <port>' reveals a connection
in LISTEN status and another in CLOSE_WAIT status. However,
from this point on no other connection from any client works.
(It takes inordinately long. I waited ten minutes with no
result other than CPU going to 100% on the client side.)
I have to re-start the server before I can do anything else.

This is really bugging me. Please help. =


RK


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