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
/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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