Re: [Xen-devel] [RESEND] Linux 2.3.23-rc3 on Xen 3.1 crashs

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

>>> Bastian Blank <bastian@xxxxxxxxxxxx> 29.08.07 13:02 >>>
>On Wed, Aug 29, 2007 at 11:39:25AM +0100, Jan Beulich wrote:
>> These aren't really meaningful, as the VM was obviously in a loop getting
>> repeated exceptions (and the stack pointer clearly went bad meanwhile).
>> You'd need to catch the state much earlier, when the first (or just very few)
>> of these exceptions happened, so that looking at the stack can actually
>> provide some insight.
>
>How? There seems to be something in tools/debugger/gdb. It seems to
>build a special gdbserver. Does this gdbserver stop the domain on an
>exception or do I need to break explicitely?

I never used it, so I don't know. But you must have been building the kernel
yourself, and given from you testing -rc kernels I also assume you're familiar
with modifying the kernel sources, so it shouldn't be too difficult to e.g.
remove registration of the illegal opcode handler so that Xen dumps the
VCPU state (and kills the VM) the first time such an exception occurs in the
guest (of course assuming there are no other instances of 'valid' uses of
the exception - you'd see this pretty quickly).

Jan


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