Robert Kaiser (FH) wrote:
quoted text
>> I think there's a bug in qemu's x86 
>> emulation with respect to mis-reporting the eip of an xchg which faults,
>> which may be what you're seeing.
>>     
>
> The eip that was reported was always the same, and there was no xchg 
> instruction at that address. It might have been consistently wrong though 
> (how would I figure this out?).
>   

The symptom I've observed is that qemu reports the first instruction of 
the basic block rather than the exchange itself.  If you "x/10i <fault 
eip>", you should see an xchg before long.

Either way, sounds like a qemu bug which should be reported to them.

    J
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