Re: [Xenomai-core] kernel threads crash

[Jesper Christensen <jbc@domain.hid>]

Problem is the NIP in question is the address of the thread structure as
seen in the error message.

/Jesper


On 2011-04-11 16:18, Philippe Gerum wrote:
> On Mon, 2011-04-11 at 16:13 +0200, Jesper Christensen wrote:
>   
>> I have updated to xenomai 2.5.6, but i'm still seeing exceptions
>> (considerably less often though):
>>
>> Xenomai: suspending kernel thread b92a39d0 ('tt_upgw_0') at 0xb92a39d0
>> after exception #1792
>>     
> You should build your code statically into the kernel, not as a module,
> and find out which code raises the MCE.
>
> CONFIG_DEBUG_INFO=y, then objdump -dl vmlinux, looking for the NIP
> mentioned.
>
>   
>> /Jesper
>>
>>
>> On 2011-04-08 15:12, Philippe Gerum wrote:
>>     
>>> On Fri, 2011-04-08 at 14:58 +0200, Jesper Christensen wrote:
>>>   
>>>       
>>>> Hi
>>>>
>>>> I'm trying to implement some gateway functionality in the kernel on a
>>>> emerson CPCI6200 board, but have run into some strange errors. The
>>>> kernel module is made up of two threads that run every 1 ms. I have also
>>>> made use of the rtpc dispatcher in rtnet to dispatch control messages
>>>> from a netlink socket to the RT part of my kernel module.
>>>>
>>>> The problem is that when loaded the threads get suspended due to exceptions:
>>>>
>>>> Xenomai: suspending kernel thread b929cbc0 ('tt_upgw_0') at 0xb929cbc0
>>>> after exception #1792
>>>>
>>>> or
>>>>
>>>> Xenomai: suspending kernel thread b929cbc0 ('tt_upgw_0') at 0x0 after
>>>> exception #1025
>>>>
>>>> or
>>>>
>>>> Xenomai: suspending kernel thread b911f518 ('rtnet-rtpc') at 0xb911f940
>>>> after exception #1792
>>>>
>>>>
>>>> I have ported the "gianfar" driver from linux to rtnet.
>>>>
>>>> The versions and hardware are listed below. The errors are most likely
>>>> due to faulty software on my part, but i would like to ask if there are
>>>> any known issues with the versions or hardware i'm using. I would also
>>>> like to ask if there are any ways of further debugging the errors as i
>>>> am not getting very far with the above messages.
>>>>     
>>>>         
>>> A severe bug at kthread init was fixed in the 2.5.5.2 - 2.5.6 timeframe,
>>> which would cause exactly the kind of weird behavior you are seeing
>>> right now. The bug triggered random code execution due to stack memory
>>> pollution at init on powerpc for Xenomai kthreads:
>>> http://git.xenomai.org/?p=xenomai-rpm.git;a=commit;h=90699565cbce41f2cec193d57857bb5817efc19a
>>> http://git.xenomai.org/?p=xenomai-rpm.git;a=commit;h=da20c20d4b4d892d40c657ad1d32ddb6d0ceb47c
>>> http://git.xenomai.org/?p=xenomai-rpm.git;a=commit;h=a5886b354dc18f054b187b58cfbacfb60bccaf47
>>>
>>> You need at the very least those three patches (from the top of my
>>> head), but it would be much better to upgrade to 2.5.6.
>>>
>>>   
>>>       
>>>>
>>>> System info:
>>>>
>>>> Linux kernel: 2.6.29.6
>>>> i-pipe version: 2.7-04
>>>> processor: powerpc mpc8572
>>>> xenomai version: 2.5.3
>>>> rtnet version: 0.9.12
>>>>
>>>>     
>>>>         
>>>   
>>>       
>>
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>>     
>