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From "Kathey Marsden (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-3869) intermittent hang pining server with IBM 1.6 on Linux
Date Thu, 04 Sep 2008 18:15:44 GMT
intermittent hang pining server with IBM 1.6 on Linux

                 Key: DERBY-3869
                 URL: https://issues.apache.org/jira/browse/DERBY-3869
             Project: Derby
          Issue Type: Bug
          Components: Network Server
    Affects Versions:
            Reporter: Kathey Marsden

 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.

The  program Repro.java shows the problem. It repeatedly starts the server, pings until it

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
		 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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