[Xenomai-help] Debug kernel module tasks

[Xenomai-help] Debug kernel module tasks

[Andreas Erler]

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Hello all,

I have got a problem in my pci driver module which is freezing my system 
completely.
I don't even have a chance to see the last messages written with printk...
So my question: is there any way to debug kernel module tasks like in 
RTLinux by connecting gdb over rtfifos?

Thanks in Advance
Andy

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Re: [Xenomai-help] Debug kernel module tasks

[Jan Kiszka]

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Andreas Erler wrote:
> Hello all,
> 
> I have got a problem in my pci driver module which is freezing my system 
> completely.
> I don't even have a chance to see the last messages written with printk...
> So my question: is there any way to debug kernel module tasks like in 
> RTLinux by connecting gdb over rtfifos?

For 2.6.16 and .17, I adapted kgdb to work with ipipe [1]. That means
you were able to attach gdb to your system via a serial nullmodem link.

Unfortunately, the kgbd development itself became unsteady again (it
stalled for more than half a year), so we have no recent vanilla kgdb
patches ATM. May change again in the future, but doesn't help right now.


What you can try meanwhile is to direct your console output to a serial
console and use ipipe_set_printk_sync(&rthal_root) to force synchronous
printk even for the Xenomai domain. Moreover, switch on debug support in
Xenomai, specifically CONFIG_XENO_OPT_DEBUG_RTDM and
CONFIG_XENO_OPT_WATCHDOG.

Jan

[1] http://download.gna.org/adeos/patches/v2.6/i386/kgdb/


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