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# 1  
Old 04-23-2020
Unable to generate thread dump
Hi,


We have been getting "Connection Time Out" issues for our Tomcat application.
One of the ways to track the problem is to run a thread dump on our applications. I used this command to generate the dump :

Code:
[root@app6 aigini]# /usr/lib/jvm/java-1.6.0-openjdk/bin/jstack -l 23688 /temp/app6thread.txt
Attaching to core /temp/app6thread.txt from executable 23688, please wait...
Error attaching to core file: Can't attach to the core file

[root@app6 aigini]# /usr/lib/jvm/java-1.6.0-openjdk/bin/jstack -l 23688 jstack.out
Attaching to core jstack.out from executable 23688, please wait...
Error attaching to core file: Can't attach to the core file
  [root@app6 aigini]#

As you can see, it throws error. Why is this, and how do I resolve this problem?


I also tried the command "jmap" below :

Code:
[root@app6 aigini]# /usr/local/jdk1.6.0_20/bin/jmap -heap:format=b 23688
Attaching to process ID 23688, please wait...
sun.jvm.hotspot.debugger.NoSuchSymbolException: Could not find symbol "gHotSpotVMTypeEntryTypeNameOffset" in any of the known library names (libjvm.so, libjvm_g.so, gamma_g)
        at sun.jvm.hotspot.HotSpotTypeDataBase.lookupInProcess(HotSpotTypeDataBase.java:388)
        at sun.jvm.hotspot.HotSpotTypeDataBase.getLongValueFromProcess(HotSpotTypeDataBase.java:369)
        at sun.jvm.hotspot.HotSpotTypeDataBase.readVMTypes(HotSpotTypeDataBase.java:102)
        at sun.jvm.hotspot.HotSpotTypeDataBase.<init>(HotSpotTypeDataBase.java:85)
        at sun.jvm.hotspot.bugspot.BugSpotAgent.setupVM(BugSpotAgent.java:568)
        at sun.jvm.hotspot.bugspot.BugSpotAgent.go(BugSpotAgent.java:494)
        at sun.jvm.hotspot.bugspot.BugSpotAgent.attach(BugSpotAgent.java:332)
        at sun.jvm.hotspot.tools.Tool.start(Tool.java:163)
        at sun.jvm.hotspot.tools.HeapDumper.main(HeapDumper.java:77)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at sun.tools.jmap.JMap.runTool(JMap.java:179)
        at sun.tools.jmap.JMap.main(JMap.java:110)
Debugger attached successfully.
 sun.jvm.hotspot.tools.HeapDumper requires a java VM process/core!

Is the above the exact output? I don't see any dump in my working directory :


Code:
[root@app6 aigini]# ll
total 721660
-rw-r--r--. 1 tcpdump tcpdump   564392105 Feb 10 17:36 app6.pcap
-rw-r--r--. 1 tcpdump tcpdump      341630 Feb 10 17:42 app6web.pcap
-rw-r--r--. 1 root    root       67714741 Jul 10  2019 etms-web.war
-rwxr-xr-x. 1 apache  apache         9278 Dec 21  2018 httpd-ssl.conf
-rw-r--r--. 1 aigini  sysadmins     15419 Feb  7 13:42 output.txt
-rw-r--r--. 1 aigini  sysadmins  51302767 Dec 12 16:24 zakat-es.war
-rw-r--r--. 1 root    root           3872 Mar 13 17:21 zakatjosso.jsp
-rw-r--r--. 1 aigini  sysadmins  55177868 Dec 10 09:53 zakat.war
 [root@app6 aigini]#

This is the PID of the JAVA (Tomcat) application (It's running as user root) :



Code:
[root@app6 aigini]# ps -ef | grep tomcat | grep 6.0.32
root     23688     1  1 14:34 ?        00:01:27 /usr/lib/jvm/java-1.6.0-openjdk/bin/java -Djava.util.logging.config.file=/usr/local/apache-tomcat-6.0.32/conf/logging.properties -XX:PermSize=128M -XX:MaxPermSize=256M -Xms512m -Xmx1024m -Djava.security.auth.login.config=/usr/local/apache-tomcat-6.0.32/conf/jaas.conf -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djava.endorsed.dirs=/usr/local/apache-tomcat-6.0.32/endorsed -classpath /usr/local/apache-tomcat-6.0.32/bin/bootstrap.jar -Dcatalina.base=/usr/local/apache-tomcat-6.0.32 -Dcatalina.home=/usr/local/apache-tomcat-6.0.32 -Djava.io.tmpdir=/usr/local/apache-tomcat-6.0.32/temp org.apache.catalina.startup.Bootstrap start

Last edited by anaigini45; 04-23-2020 at 06:20 AM..
# 2  
Old 04-23-2020
Collect Core Dumps
Shows how to locate core files. It looks to me like you do not have any existing core dumps -- I was not sure of your platform, looks like Solaris.
The article has a branchpoint set of links to platform specific information.

Plus I do not think version 6 of java is supported any longer. So getting Oracle help may not exist.

If anyone else knows more, please correct me.

You do know that sending the SIGSEGV signal to a given process (as root) will force a dump. Not a good idea in a production environment.
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