Re: [Xenomai-help] kernel 2.6.32.11 with xenomai 2.5.3 fails to boot on ubuntu lucid system

[Stefan Kisdaroczi <kisda@domain.hid>]

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On 17.08.2010 20:06, Jan Kiszka wrote:
> Stefan Kisdaroczi wrote:
>   
>> I installed the kernel (2.6.32.15 2.5.4 x86 32bit) which is working on
>> my laptop in a kvm machine.
>> In the virtual machine the kernel never starts and hangs.
>>     
> To make sure you are not facing a KVM issue (though they are much rarer
> theses days - given you are using a recent KVM version...), please
> cross-check if the guest behaves identically when booting without KVM
> support (-no-kvm when using qemu-kvm).
>   

Hi Jan,

thanks for the hints.
With versions 0.12.4 setting breakpoints with gdb didn't work, with
0.12.5 they work.

Stefan

>> I attached gdb to kvm and according to the cpu registers and system.map
>> it hangs in 'doublefault_fn'. As I'm not really familiar with gdb i'm
>> thankful if someone has a hint how to proceed. Thanks
>>     
> Build the kernel with CONFIG_DEBUG_INFO, start "gdb
> /linux/src/path/vmlinux", then type "bt" at the gdb prompt when the
> guest hangs. This should dump a symbolic backtrace - though likely not
> beyond the exception entry. In that case, you could help us by examining
> the origin of the exception (parameters to the exception handler, it
> specifically receives a full register state).
>
> Also note that there are graphical debuggers, e.g. ddd, that can help
> working with gdb without knowing all its commands by heart.
>
> Jan
>
>   



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