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From "Jeffrey Janner" <Jeffrey.Jan...@PolyDyne.com>
Subject RE: Hung threads
Date Tue, 13 Apr 2010 14:50:59 GMT
Before someone asks for it:
    <Connector address="172.16.27.1" port="443" maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="5" maxSpareThreads="75"
               enableLookups="false" acceptCount="100" 
               connectionTimeout="20000" disableUploadTimeout="true"
compression="on"
 
compressableMimeType="text/html,text/xml,text/plain,text/css,text/csv,te
xt/javascript,text/rtf,text/richtext"
               scheme="https" secure="true" clientAuth="false"
SSLEngine="on"
               SSLCertificateFile="path_to_server.crt"
               SSLCertificateKeyFile=" path_to_server.key"
               SSLCertificateChainFile="path_to_server_chain.crt"
               SSLPassword="changeit" />

-----Original Message-----
From: Jeffrey Janner [mailto:Jeffrey.Janner@PolyDyne.com] 
Sent: Tuesday, April 13, 2010 9:44 AM
To: Tomcat Users List
Subject: Hung threads

I had a connector go from minimal connections (restart) to all threads
hung overnight.

The current thread dump shows the threads as follows:

 

"http-172.16.27.1-443-150" daemon prio=6 tid=0x66793800 nid=0xe43c in
Object.wait() [0x7063f000]

   java.lang.Thread.State: WAITING (on object monitor)

                at java.lang.Object.wait(Native Method)

                - waiting on <0x1a924f00> (a
org.apache.tomcat.util.net.AprEndpoint$Worker)

                at java.lang.Object.wait(Object.java:485)

                at
org.apache.tomcat.util.net.AprEndpoint$Worker.await(AprEndpoint.java:125
5)

                - locked <0x1a924f00> (a
org.apache.tomcat.util.net.AprEndpoint$Worker)

                at
org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1280)

                at java.lang.Thread.run(Thread.java:619)

 

"http-172.16.27.1-443-149" daemon prio=6 tid=0x6496d400 nid=0xe400 in
Object.wait() [0x705ff000]

   java.lang.Thread.State: WAITING (on object monitor)

                at java.lang.Object.wait(Native Method)

                - waiting on <0x1a954140> (a
org.apache.tomcat.util.net.AprEndpoint$Worker)

                at java.lang.Object.wait(Object.java:485)

                at
org.apache.tomcat.util.net.AprEndpoint$Worker.await(AprEndpoint.java:125
5)

                - locked <0x1a954140> (a
org.apache.tomcat.util.net.AprEndpoint$Worker)

                at
org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1280)

                at java.lang.Thread.run(Thread.java:619)

 

"http-172.16.27.1-443-148" daemon prio=6 tid=0x6496f400 nid=0xe3b0 in
Object.wait() [0x705bf000]

   java.lang.Thread.State: WAITING (on object monitor)

                at java.lang.Object.wait(Native Method)

                - waiting on <0x1a8655f0> (a
org.apache.tomcat.util.net.AprEndpoint$Worker)

                at java.lang.Object.wait(Object.java:485)

                at
org.apache.tomcat.util.net.AprEndpoint$Worker.await(AprEndpoint.java:125
5)

                - locked <0x1a8655f0> (a
org.apache.tomcat.util.net.AprEndpoint$Worker)

                at
org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1280)

                at java.lang.Thread.run(Thread.java:619)

 

and so on.  Other connectors are running OK, though some also show
threads in the same state.  All other threads look normal.  This has one
customer's app hung, but others in the Tomcat instance are working just
fine.  Any help on where to start looking here?



Server Details:  Windows 2000 SP4, Sun JDK 1.6.0_18, Tomcat 5.5.17,
native libs 1.1.18.

 

Waiting for TC 5.5.29 before upgrading due to bugs with APR/SSL in
5.5.28.

 

Jeff


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This message is intended for the use of the individual or entity to which 
it is addressed and may contain information that is privileged, 
confidential, and exempt from disclosure under applicable law.  If the 
reader of this message is not the intended recipient or the employee or 
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you are hereby notified that any dissemination, distribution, or copying 
of this communication is strictly prohibited.  If you have received this 
communication in error, please notify us immediately by reply or by 
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