[Mono-list] My program randomly doesn't work with Mono

Wed May 16 11:45:05 EDT 2007

Hi,

I too have different behaviors if I put a Console.WriteLine in my code.
Consider the following example :

static void Main(string[] args)
{
    int num = 5000000;
    Hashtable table = new Hashtable();
    for (int i = 0; i < num; ++i)
    {
        Object obj = new Object();
        table.Add(obj, obj);
    }
}

That crashes somewhere inside the for loop.  But if I add a WriteLine at the
beginning like this :

static void Main(string[] args)
{
    int num = 5000000;
    Console.WriteLine("WriteLine");
    Hashtable table = new Hashtable();
    for (int i = 0; i < num; ++i)
    {
        Object obj = new Object();
        table.Add(obj, obj);
    }
}

Everything works fine.  Then if I add another WriteLine at the end followed
by a Thread.Sleep, it crashes again, but this time inside the Thread.Sleep :

static void Main(string[] args)
{
    int num = 5000000;
    Console.WriteLine("WriteLine");
    Hashtable table = new Hashtable();
    for (int i = 0; i < num; ++i)
    {
        Object obj = new Object();
        table.Add(obj, obj);
    }
    Console.WriteLine("WriteLine");
    Thread.Sleep(10000);
}

Any modifications to that code may lead to different behaviors.  Sometimes I
seem to end up being stuck in a infinite loop (with 2.8 gig of allocated
virtual memory).  It seems like the size of the executable has an impact on
the result...

Now I don't know if it is related to the bug you describe, but it sures look
like the same problem.

Jonathan

-----Message d'origine-----
De : mono-list-bounces at lists.ximian.com
[mailto:mono-list-bounces at lists.ximian.com] De la part de Chris Seaton
Envoyé : Wednesday, May 16, 2007 11:23 AM
À : Robert Jordan
Cc : Mono-list at lists.ximian.com
Objet : Re: [Mono-list] My program randomly doesn't work with Mono

No, the program doesn't hang. The program logic acts differently even though
the input is exactly the same. There are no threads, only IO is reading from
a file that I am positive is not changing, no date time calculations, no
random numbers, no networking, no libraries, no external programs, nothing.
I am positive the program should run exactly the same each time, but it
doesn't. And then when I put a Console.WriteLine in to see where it might be
going wrong, it sometimes magically works again. The program is far too big
to submit as a test case.

Any ideas?

Chris Seaton

On 16 May 2007, at 12:51, Robert Jordan wrote:

> Hi,
>
> Chris Seaton wrote:
>> I ran it several times in GDB and managed to reproduce the problem, 
>> but GDB didn't say that anything went wrong.
>
> When the program is hanging again, send it a SIQUIT:
>
> 	kill -QUIT <pid-of-the-prog>
>
> The runtime will dump a backtrace of all threads.
>
> If you are proficient with GDB (see http://mono-project.com/ 
> Debugging), you could interrupt the debugger with Ctrl-C and call the 
> "mono_backtrace" macro.
>
> After you've got a backtrace (either from SIGQUIT or gdb), go to 
> http://mono-project.com/Bugs and file a bug for the "Runtime"
> component, preferably with a small test case.
>
> Robert
>
>
>>
>> Chris
>>
>> On 16 May 2007, at 12:03, joeri Belis wrote:
>>
>>> Does it work when run from a debugger environment?
>>>
>>> -----Oorspronkelijk bericht-----
>>> Van: mono-list-bounces at lists.ximian.com
>>> [mailto:mono-list-bounces at lists.ximian.com] Namens Chris Seaton
>>> Verzonden: woensdag 16 mei 2007 12:08
>>> Aan: List Mono
>>> Onderwerp: [Mono-list] My program randomly doesn't work with Mono
>>>
>>> Hi,
>>>
>>> Sorry for the very strange and vague issue report:
>>>
>>> My c sharp mono program randomly works and doesn't work. When I say 
>>> doesn't work - it doesn't crash - the program logic  inexplicably 
>>> fails - I know, I know, bear with me...
>>>
>>> My program has no IO apart from reading from files that I am 
>>> positive are not changing between runs. There is no network code. 
>>> There is no threading at all. There is no external process 
>>> launching. There are no libraries apart from System.*.
>>>
>>> When it suddenly stops working, if I put in a Console.WriteLine 
>>> statement to see what's going on at a certain point it will suddenly 
>>> work. And that's "Console.WriteLine("test")" - I'm not calling a 
>>> property or anything that could possibly have a side effect in 
>>> evaluating it.
>>>
>>> I've tried running my program on two separate installations of Mono 
>>> on a PowerPC OS X and an x86 Linux, one of those not being set up by 
>>> myself. I've tried 1.2.3.1 and 1.2.4 with the same problem. It's 
>>> very intermittent. I'll be working happily
>>>
>>> The only strange thing I do is a massive amount of dynamic code 
>>> emission. Lots of TypeBuilder and DynamicMethods. It also uses a 
>>> fair bit of memory, usually up to about 500 MB. I am positive that 
>>> there must be some subtle bug somewhere in Mono.
>>>
>>> I know this is no information to diagnose any problem, but has 
>>> anyone else had any kind of similar experience? Could anyone suggest 
>>> anything I could try? Remember, there is no crash - the output of my 
>>> program simply becomes wrong as if it branched incorrectly at some 
>>> point, or some bit of memory changed behind my back.
>>>
>>> Thanks
>>>
>>> Chris Seaton
>>> _______________________________________________
>>> Mono-list maillist  -  Mono-list at lists.ximian.com 
>>> http://lists.ximian.com/mailman/listinfo/mono-list
>>>
>>>
>>
>> _______________________________________________
>> Mono-list maillist  -  Mono-list at lists.ximian.com 
>> http://lists.ximian.com/mailman/listinfo/mono-list
>>
>
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