hmm...

Xenomai: suspending kernel thread b911f518 ('rtnet-rtpc') at
nip=0x1088860, lr=0x1088862 after exception #1025

LR points to nowhere...Maybe i should do a hexdump of the stack and
manually decode it.

/Jesper


On 2011-04-11 16:49, Jesper Christensen wrote:
> I'll just give them a run and see, thanks!
>
> /Jesper
>
>
> On 2011-04-11 16:39, Philippe Gerum wrote:
>   
>> On Mon, 2011-04-11 at 16:32 +0200, Jesper Christensen wrote:
>>   
>>     
>>> How do i see that?
>>>
>>>     
>>>       
>> diff --git a/include/asm-powerpc/system.h b/include/asm-powerpc/system.h
>> index 5cc4a23..8dbc537 100644
>> --- a/include/asm-powerpc/system.h
>> +++ b/include/asm-powerpc/system.h
>> @@ -104,7 +104,7 @@ typedef struct xnarch_fltinfo {
>>  #define xnarch_fault_trap(fi)   ((unsigned int)(fi)->regs->trap)
>>  #define xnarch_fault_code(fi)   ((fi)->regs->dar)
>>  #define xnarch_fault_pc(fi)     ((fi)->regs->nip)
>> -#define xnarch_fault_pc(fi)     ((fi)->regs->nip)
>> +#define xnarch_fault_lr(fi)     ((fi)->regs->link)
>>  /* FIXME: FPU faults ignored by the nanokernel on PPC. */
>>  #define xnarch_fault_fpu_p(fi)  (0)
>>  /* The following predicates are only usable over a regular Linux stack
>> diff --git a/ksrc/nucleus/pod.c b/ksrc/nucleus/pod.c
>> index b5ddbaa..c1722e7 100644
>> --- a/ksrc/nucleus/pod.c
>> +++ b/ksrc/nucleus/pod.c
>> @@ -2591,8 +2591,8 @@ int xnpod_trap_fault(xnarch_fltinfo_t *fltinfo)
>>  
>>      if (!xnpod_userspace_p()) {
>>              xnprintf
>> -                ("suspending kernel thread %p ('%s') at 0x%lx after 
>> exception #%u\n",
>> -                 thread, thread->name, xnarch_fault_pc(fltinfo),
>> +                ("suspending kernel thread %p ('%s') at nip=0x%lx, lr=0x%lx 
>> after exception #%u\n",
>> +                 thread, thread->name, xnarch_fault_pc(fltinfo), 
>> xnarch_fault_lr(fltinfo),
>>                   xnarch_fault_trap(fltinfo));
>>  
>>              xnpod_suspend_thread(thread, XNSUSP, XN_INFINITE, XN_RELATIVE, 
>> NULL);
>>   
>>     
>>> /Jesper
>>>
>>>
>>> On 2011-04-11 16:27, Philippe Gerum wrote:
>>>     
>>>       
>>>> On Mon, 2011-04-11 at 16:20 +0200, Jesper Christensen wrote:
>>>>   
>>>>       
>>>>         
>>>>> Problem is the NIP in question is the address of the thread structure as
>>>>> seen in the error message.
>>>>>     
>>>>>         
>>>>>           
>>>> LR?
>>>>
>>>>   
>>>>       
>>>>         
>>>>> /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
>>>>>>>>>
>>>>>>>>>     
>>>>>>>>>         
>>>>>>>>>             
>>>>>>>>>                 
>>>>>>>>>                   
>>>>>>>>   
>>>>>>>>       
>>>>>>>>           
>>>>>>>>               
>>>>>>>>                 
>>>>>>> _______________________________________________
>>>>>>> Xenomai-core mailing list
>>>>>>> Xenomai-core@gna.org
>>>>>>> https://mail.gna.org/listinfo/xenomai-core
>>>>>>>     
>>>>>>>         
>>>>>>>             
>>>>>>>               
>>>>>>   
>>>>>>       
>>>>>>           
>>>>>>             
>>>>>     
>>>>>         
>>>>>           
>>>>   
>>>>       
>>>>         
>>>     
>>>       
>>   
>>     
>
> _______________________________________________
> Xenomai-core mailing list
> Xenomai-core@gna.org
> https://mail.gna.org/listinfo/xenomai-core
>
>   


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