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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-3869) intermittent hang pinging server on Linux
Date Fri, 19 Sep 2008 20:50:44 GMT

     [ https://issues.apache.org/jira/browse/DERBY-3869?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Kathey Marsden updated DERBY-3869:

    Attachment: TryHang.java

I am trying to emulate the hang just using Sockets (outside of network server) to try to understand
what is going on. From my experimentation, it seems that as long as the server socket is closed,
the backlog of blocked clients will be reset and give the message:
java.net.SocketException: Connection reset
        at java.net.SocketInputStream.read(SocketInputStream.java:197)
        at java.net.SocketInputStream.read(SocketInputStream.java:211)
        at TryHang$1.run(TryHang.java:49)

as soon as the server socket is closed.  So I am not really sure why that is not happening
with the pending ping request with network server.

> intermittent hang pinging  server on Linux
> ------------------------------------------
>                 Key: DERBY-3869
>                 URL: https://issues.apache.org/jira/browse/DERBY-3869
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server
>    Affects Versions:
>         Environment: java version "1.6.0"
> Java(TM) SE Runtime Environment (build pxi3260sr1-20080416_01(SR1))
> IBM J9 VM (build 2.4, J2RE 1.6.0 IBM J9 2.4 Linux x86-32 jvmxi3260-20080415_1876
> J9VM - 20080415_018762_lHdSMr
> JIT  - r9_20080415_1520
> GC   - 20080415_AA)
> JCL  - 20080412_01
>            Reporter: Kathey Marsden
>         Attachments: derby-3869_sleep_to_force_hang_diff.txt, derby.log, javacore.20080903.183815.7684.0001.txt,
Repro.java, TryHang.java
>  am looking at a intermittent hang with IBM 1.6 on Linux with the ping 
> command.  I am not entirely sure it is a jvm issue, but I have not been 
> able to reproduce the hang with other jvms.  
> The trace is
> 3XMTHREADINFO      "main" TID:0x08072500, j9thread_t:0x08057AF4, state:R, prio=5
> 3XMTHREADINFO1            (native thread ID:0x1E05, native priority:0x5, native policy:UNKNOWN)
> 4XESTACKTRACE          at java/net/SocketInputStream.socketRead0(Native Method)
> 4XESTACKTRACE          at java/net/SocketInputStream.read(SocketInputStream.java:140)
> 4XESTACKTRACE          at java/net/SocketInputStream.read(SocketInputStream.java:101)
> 4XESTACKTRACE          at org/apache/derby/impl/drda/NetworkServerControlImpl.fillReplyBuffer(NetworkServerControlImpl.java:2764)
> 4XESTACKTRACE          at org/apache/derby/impl/drda/NetworkServerControlImpl.readResult(NetworkServerControlImpl.java:2708)
> 4XESTACKTRACE          at org/apache/derby/impl/drda/NetworkServerControlImpl.pingWithNoOpen(NetworkServerControlImpl.java:1169)
> 4XESTACKTRACE          at org/apache/derby/impl/drda/NetworkServerControlImpl.ping(NetworkServerControlImpl.java:1144(Compiled
> 4XESTACKTRACE          at org/apache/derby/drda/NetworkServerControl.ping(NetworkServerControl.java:395(Compiled
> 4XESTACKTRACE          at Repro.pingForServerUp(Repro.java:38(Compiled Code))
> 4XESTACKTRACE          at Repro.startAndShutdown(Repro.java:20)
> The client has sent the ping, but there is no corresponding session on 
> the server side to process the
> command. The full thread dump is in.
> javacore.20080903.183815.7684.0001.txt
> The  program Repro.java shows the problem. It repeatedly starts the server, pings until
> comes up, and then shuts down.
> In the derby.log I see a startup error, that the address is already in 
> use, so presumably the shutdown is not complete before we start the 
> server and then perhaps it shuts down mid ping causing the hang?
> 2008-09-04 01:37:51.048 GMT : Could not listen on port 1527 on host
>  java.net.BindException: Address already in use
> An exception was thrown during network server startup. DRDA_ListenPort.S:Could not listen
on port 1527 on host
>  java.net.BindException: Address already in use
> java.lang.reflect.InvocationTargetException
> 		 at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
> 		 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
> 		 at java.lang.reflect.Method.invoke(Method.java:599)
> 		 at org.apache.derby.iapi.jdbc.DRDAServerStarter.run(DRDAServerStarter.java:236)
> 		 at java.lang.Thread.run(Thread.java:735)
> Caused by: java.lang.Exception: DRDA_ListenPort.S:Could not listen on port 1527 on host
>  java.net.BindException: Address already in use
> 		 at java.lang.Throwable.<init>(Throwable.java:67)
> 		 at org.apache.derby.impl.drda.NetworkServerControlImpl.consolePropertyMessageWork(NetworkServerControlImpl.java:3179)
> 		 at org.apache.derby.impl.drda.NetworkServerControlImpl.consolePropertyMessage(NetworkServerControlImpl.java:1861)
> 		 at org.apache.derby.impl.drda.NetworkServerControlImpl.blockingStart(NetworkServerControlImpl.java:731)
> 		 ... 5 more
> Full log is attached as derby.log

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