[Mono-list] My program randomly doesn't work with Mono
Chris Seaton
chris at chrisseaton.com
Wed May 16 11:55:08 EDT 2007
Sorry to reply again, but just realised I too have an extremely big
hashtable that if was returning incorrect values would cause the
logic error I'm seeing. I'm going to try replacing it with a
different data structure and see what happens.
Chris
On 16 May 2007, at 16:51, Chris Seaton wrote:
> Aaah! It must be a memory thing then! I'm so glad someone else is
> experiencing this.
>
> Chris
>
> On 16 May 2007, at 16:45, Jonathan Gagnon wrote:
>
>> 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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>>> http://lists.ximian.com/mailman/listinfo/mono-list
>>
>> _______________________________________________
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>> http://lists.ximian.com/mailman/listinfo/mono-list
>>
>
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