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

-- 
Philippe.



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