[Mono-list] _wapi_handle_unref: Attempting to unref unused handle / InvalidOperationException: Process has not been started

[Yury Serdyuk]

Hi !

I have some troubles with the process starting.
Conretely, I have tested the following simple code:

> String[] hosts = new String [] { "node-38-02", "node-38-03", 
> "node-38-04", "node-38-05" , "node-38-06", "node-38-07", "node-38-08",
>                                     "node-63-04", "node-63-05", 
> "node-63-06", "node-63-08", "node-63-09"                              };
>
>   String arg = "hostname";
>   foreach ( String host in hosts ) {
>
>    Process ssh_process = new Process();
>    ssh_process.StartInfo.UseShellExecute  = false;
>   
>    ssh_process.StartInfo.FileName  = "ssh";
>    ssh_process.StartInfo.Arguments = " " + host + " " + arg;
>
>    Console.WriteLine ( ssh_process.StartInfo.FileName + 
> ssh_process.StartInfo.Arguments );
>
>    ssh_process.Start ();
>
>    if ( ssh_process.HasExited )
>     Console.WriteLine ( "Has Exited with code = " + 
> ssh_process.ExitCode );
>
>   }

Often, the result was:

> $ mono ssh_test.exe
> ssh node-38-02 hostname
> ssh node-38-03 hostname
> ssh node-38-04 hostname
> ssh node-38-05 hostname
> ssh node-38-06 hostname
> ssh node-38-07 hostname
> ssh node-38-08 hostname
> ssh node-63-04 hostname
> ssh node-63-05 hostname
> ssh node-63-06 hostname
> ssh node-63-08 hostname
> ssh node-63-09 hostname
> Has Exited with code = 0
>
> _wapi_handle_unref: Attempting to unref unused handle 0x1d0000001c

or even

> $ mono ssh_test.exe
> ssh node-38-02 hostname
> ssh node-38-03 hostname
> ssh node-38-04 hostname
> ssh node-38-05 hostname
> ssh node-38-06 hostname
> Has Exited with code = 0
> ssh node-38-07 hostname
> ssh node-38-08 hostname
> ssh node-63-04 hostname
> Has Exited with code = 0
> ssh node-63-05 hostname
> ssh node-63-06 hostname
> ssh node-63-08 hostname
> ssh node-63-09 hostname
> Start done ...
> Wait done ...
> _wapi_handle_unref: Attempting to unref unused handle 0xe
> _wapi_handle_unref: Attempting to unref unused handle 0x1500000014


I found the following message about Mono bug
http://lists.ximian.com/pipermail/mono-bugs/2009-January/084380.html
with the supplement that

>--- Comment #2 from Zoltan Varga <vargaz at gmail.com <http://lists.ximian.com/mailman/listinfo/mono-bugs>>  2009-01-18 09:01:37 MST ---
>Fixed in SVN HEAD. This process refcounting stuff is tricky, so I didn't
>backport it to 2.2/2.0.
>  
>
Then I  run a heavy application on the machine and repeated the test.
The result was

> $ mono ssh_test.exe
> ssh node-38-02 hostname
>
> Unhandled Exception: System.InvalidOperationException: Process has not 
> been started.
>   at System.Diagnostics.Process.get_HasExited () [0x00000] in 
> <filename unknown>:0
>   at (wrapper remoting-invoke-with-check) 
> System.Diagnostics.Process:get_HasExited ()
>   at ssh_test.Main (System.String[] args) [0x00000] in <filename 
> unknown>:0

I have tested the program under Mono 2.10.1.
So how is it possible to fix this problem ?

Thanks.

Yury
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