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

[Chris Seaton]

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
>>
>
> _______________________________________________
> Mono-list maillist  -  Mono-list at lists.ximian.com
> http://lists.ximian.com/mailman/listinfo/mono-list