Re: AW: AW: [Xenomai-help] resubmission : memset of heap crashes Xenomai-Task

[Jan Kiszka <jan.kiszka@domain.hid>]

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Roderik_Wildenburg@domain.hid wrote:
> jan.kiszka@domain.hid [mailto:jan.kiszka@domain.hid] :
>  
>> First of all, do we know where the demo precisely faults? In 
>> which heap's memset? We could then analyse how this heap is 
>> being set up in the kernel, if all mappings are done as 
>> expected, if reasonable address are passed to the user, etc.
>>
> 
> It crashs when the last heap is touched (please see programs output below).

Where precisely? What address is touched? Already tried to catch the
SEGV with a debugger?

> Astonishingly it does not crash every time !? In fact I had to reboot to produce this output (after running the program several times without a crash; don´t ask me why) :
>  
> Start Heap
> root_thread_init :
> timer startedt
> display task created
> root_thread_init beendet
> Available Memory 113377280 (Pagesize 4096)
> heap 0 of size 16000000 created
> Heap 0 allocated size 16000000
> heap 1 of size 16000000 created
> Heap 1 allocated size 16000000
> heap 2 of size 16000000 created
> Heap 2 allocated size 16000000
> heap 3 of size 16000000 created
> Heap 3 allocated size 16000000
> heap 4 of size 16000000 created
> Heap 4 allocated size 16000000
> heap 5 of size 16000000 created
> Heap 5 allocated size 16000000
> heap 6 of size 16000000 created
> Heap 6 allocated size 16000000
> Available Memory after allocation 4317184
> Heap 7 created with size 1505280
> Heap 7 allocated size 1505280
> Memory allocated in total : 113505280
> Setting heap 0. Size 16000000
> Setting heap 1. Size 16000000
> Setting heap 2. Size 16000000
> Setting heap 3. Size 16000000
> Setting heap 4. Size 16000000
> Setting heap 5. Size 16000000
> Setting heap 6. Size 16000000
> Setting heap 7. Size 1505280
> Segmentation fault 
> 
>>> I may have my hands on a 405 board on Friday, but I'm not 
>> sure if I can do much more testing than a simple run of the 
>> program. Of course, testing will primarily take place over 
>> latest Xenomai...
>>
> 
> This certainly would be helpful, especially if you could reproduce the problem (so I know I don´t hunt a phantasm).
> 
>> Roderik, you said you tested under Qemu as well? For PPC or x86 arch?
> 
> I thought, you tested with Qemu without success (crash). But perhaps my rememberence mixes something up. When I said, that the crash could not be reproduced with Qemu I thought to reference your test. Isn´t this correct ?  

Ok, misunderstanding. I tried with Qemu and real x86 hardware, but only
over 2.6 so far. Will have to check with 2.4 as well because of the
over-commitment 2.6 does when requesting memory + the OOM killer
shooting the test immediately.

Jan


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