On 11/06/2011 01:03 PM, Gilles Chanteperdrix wrote:
> On 11/06/2011 08:00 PM, at91_enthus wrote:
>> On 11/06/2011 12:32 PM, Gilles Chanteperdrix wrote:
>>> On 11/06/2011 07:25 PM, at91_enthus wrote:
>>>> On 11/06/2011 12:10 PM, at91_enthus wrote:
>>>>> On 11/06/2011 12:01 PM, Gilles Chanteperdrix wrote:
>>>>>> On 11/06/2011 06:56 PM, at91_enthus wrote:
>>>>>>> Hi.
>>>>>>>
>>>>>>> I gave Xenomai 2.6.0 a try and installed a newly patched kernel on my
>>>>>>> AT91SAM9G20 board.
>>>>>>>
>>>>>>> Here is my setup:
>>>>>>>
>>>>>>> proc:   AT91SAM9G20
>>>>>>> kernel: 2.6.35.9
>>>>>>> OS: embedded Debian Squeeze
>>>>>>>
>>>>>>> The board boots fine up to stage 2 (user terminal). Sometimes, I am able
>>>>>>> to get a login terminal, despite seg fault messages.
>>>>>>>
>>>>>>> A similar behavior occurs in a Xenomai capable 2.6.37 kernel, only
>>>>>>> without the fault messages. In this case the board simply freezes.
>>>>>>>
>>>>>>> I included the files (.config and fault messages) in the attachments.
>>>>>>>
>>>>>> You enabled CONFIG_FCSE_GUARANTEED, I do not think Debian squeeze can
>>>>>> boot with that, you need a real embedded filesystem, or use
>>>>>> CONFIG_FCSE_BEST_EFFORT.
>>>>>>
>>>>>>
>>>>> Since I've started looking in to Xenomai, I have been using FCSE
>>>>> "guaranteed" and "best efort"  along with both Debian Squeeze and Lenny
>>>>> (Xenomai 2.5 series) without any issues.
>>>>>
>>>>> I'll change the FCSE setting to see if I get a different behavior.
>>>>>
>>>>> Regards.
>>>> I put the results for CONFIG_FCSE_BEST_EFFORT in the attachment.
>>> Unusable. To make it usable, the following options are lacking:
>>> CONFIG_FCSE_MESSAGES
>>> CONFIG_FRAME_POINTER
>> I couldn't find this option.
> You need to disable STACK_UNWIND. Without it, some stack traces are
> unreadable such as the one you keep sending.
>

rc.local looked suspicious in the debug messages.

To be more exact, it contained the following lines:

#! /bin/sh
chmod 777 /proc/xenomai/latency
echo "1000" > /proc/xenomai/latency
exit 0

The setting came from the previous installation, because I kept getting
negative values for latencies.

Anyway, I removed the offending lines and my system boots correctly. If
I enter the lines by hand, I get no segfaults. However, if I try to
execute /etc/rc.local (with the two lines uncommented) by hand, the
kernel seg faults and the system freezes.

 Odd.