[Mono-bugs] [Bug 532568] Exception: at System.Int32.Parse (System.String s) [0x00000]

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http://bugzilla.novell.com/show_bug.cgi?id=532568

User ddavis at novell.com added comment
http://bugzilla.novell.com/show_bug.cgi?id=532568#c6





--- Comment #6 from Darren Davis <ddavis at novell.com>  2009-08-20 10:20:37 MDT ---
Reposting the description for public view:

I have created pair of test apps that contain the logic that I think is
causing the problem; there's a client app (ProxyTest) and the server
component(ServerLite). The server app creates a TCP listener, waits for XML
commands and sends back an XML response (more details below). The client app
connects to the server, sends a command, gets a response, disconnects and
repeats. On windows, the app is successfully (and consistently) able to send
10,000 commands. Under Mono, its failing at 20 (consistently).

The windows environment is VS2008 and .net 3.5 (hosted on windows server
2003). The Mono environment is 2.4.2.3 on the VMWARE image.

Details on the App:

ServerLite:

Program.cs contains the bulk of the logic (I hacked it together from the
standard build so apologies in advance on style).

TestApp.Run:
Creates 20 ProxyThreads; these are going to read xml commands from a network
stream sent by the ProxyTest app.
The ProxyReader class contains a method Read that waits for a signal
indicating that it has a network stream to read from; it reads from the
stream until the stream fails; it then releases the socket, closes it and
then marks itself as free again and waits for the next signal indicating it
should start.

Run then creates _xmlProcessorThread = new Thread(new
ThreadStart(ProcessASXmlRequest)); ProcessASXMLRequest (Process Application
Service XML Request) dequeues the next command received from one of the
client consumer apps, processes it and writes an XML response back on the
network stream to the client app via the ProcessProxyMessage method (3 param
overload).

Run then creates _listenerThread = new Thread(new
ThreadStart(ProxyListener)); ProxyListener listens for incoming TCP
connections, Accepts them and selects one of the ProxyReader threads (the
next free one) to handle the connection; it saves the Socket and network
stream details in the ProxyReader structure and then signals for the
ProxyReader to start (this mechanism reduces the overhead of continuously
creating new threads) - this results in the thread looping in the
ProxyReader.Read loop(see above).

The ProxyTest application is pretty basic, it creates an instance of the
Proxy and sends commands to the service and waits for a response via the
LeakTest() method.
            public void Run()
            {
                for (int j = 0; j < 1000; j++)
                {
                    Console.WriteLine("send Leaktest command");
                    this.LeakTest(255);
                    Console.WriteLine("Leaktest response received");
                }
            }

I can run ProxyTest with j = 10,000 on Windows and this works fine. It fails
on Mono at cycle 20 (the size of the proxythreads structure). The
ProxyServer fails as follows:

Expected Failure:
ProcessASXmlRequest:(entry). Node Name = VQSystem.LeakTest.Request
ProcessASXmlRequest:CoreLock obtained
LeakTest accountId:255 not found
Return:<?xml version="1.0"
encoding="utf-16"?><VQProxy_XML_API><Version>5.0.36.0</Version><Response><VQ
System.LeakTest.Response><ResultData><![CDATA[System.Xml.XmlDataDocument]]><
/ResultData><ReturnValue>OK</ReturnValue></VQSystem.LeakTest.Response></Resp
onse></VQProxy_XML_API>
ProcessASXmlRequest:(exit). Node Name = VQSystem.LeakTest.Request
ProcessASXmlRequest:CoreLock released
ProcessASXmlRequest:(entry). Node Name = VQSystem.LeakTest.Request
ProcessASXmlRequest:CoreLock obtained
LeakTest accountId:255 not found
Return:<?xml version="1.0"
encoding="utf-16"?><VQProxy_XML_API><Version>5.0.36.0</Version><Response><VQ
System.LeakTest.Response><ResultData><![CDATA[System.Xml.XmlDataDocument]]><
/ResultData><ReturnValue>OK</ReturnValue></VQSystem.LeakTest.Response></Resp
onse></VQProxy_XML_API>
ProcessASXmlRequest:(exit). Node Name = VQSystem.LeakTest.Request
ProcessASXmlRequest:CoreLock released
ProxyListener:Exception:Argument cannot be null.
Parameter name: s
ProxyListener:Exception:  at System.Int32.Parse (System.String s) [0x00000]
  at VQ.Proxy..ctor () [0x00000]
  at VQ.VQSystem.Trace (TraceModes traceMode, TraceLevel traceLevel,
System.String component, System.String method, System.String message)
[0x00000]
  at VQ.TraceHelper.Trace (TraceLevel level, System.String message,
System.Exception ex) [0x00000]
  at VQ.TraceHelper.TraceFatal (System.String message, System.Exception ex)
[0x00000]
  at VQ.FatalException..ctor (System.String Message) [0x00000]
  at VQ.TestApp.GetNextFreeProxyThread () [0x00000]
  at VQ.TestApp.ProxyListener () [0x00000]

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