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Date: Thu, 11 Oct 2012 14:40:16 +0200
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai] Oops while running "cat /proc/xenomai/stat"
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To: Stefan Roese <stefan.roese@gmail.com>
Cc: xenomai@xenomai.org

On 10/11/2012 01:56 PM, Stefan Roese wrote:
> On 10/09/2012 05:44 PM, Stefan Roese wrote:
>> On 10/09/2012 04:24 PM, Philippe Gerum wrote:
>>> On 10/09/2012 08:48 AM, Stefan Roese wrote:
>>>
>>>> [   65.601569] [c716bba0] [c009adf0] rtdm_event_signal+0x50/0xe4
>>>> [   65.607440] [c716bbc0] [cb132588] fpga_dma_done_callback+0x18/0x28 [rt_fpga]
>>>> [   65.614641] [c716bbd0] [cb101114] mpc52xx_lpbfifo_bcom_irq+0x114/0x1c4 [rt_mpc52xx_lpbfifo]
>>>
>>> Is any list corruption detected when CONFIG_XENO_OPT_DEBUG_QUEUES is
>>> enabled?
>>
>> No, I don't see any list corruptions with CONFIG_XENO_OPT_DEBUG_QUEUES
>> enabled. But the crash log is different now. At least part of the
>> "stat" is printed. And the crash happens now in xnintr_irq_handler().
>> This different crash seems to result from a change of the kernel
>> config (I enabled/disabled some other drivers as well in the meantime).
>> I'm debugging now, how different kernel configurations result in different
>> crash scenarios.
> 
> I now strapped down my device driver to the absolute minimum. 
> "cat /proc/xenomai/stat" still does crash. But not all the time, and not
> always with the same output. Very strange is the "0x100100" in the
> output below. This is included in many of the crash reports. Does this
> ring a bell?

#define LIST_POISON1  ((void *) 0x00100100 + POISON_POINTER_DELTA)

Somebody might be doing bad things with memory it does not own anymore?

-- 
Philippe.