Re: [Xen-devel] NMI with SMP domain causing machine to reboot

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 9 Sep 2005, at 18:44, Santos, Jose Renato G wrote:

> Any chance you could try reproducing this behavior in one of
>   your machines?
>   Can you think of any situation that would cause the machine to
>   reboot without printing any error message in the serial console?
Only a triple fault, which can only occur if our double fault handler 
fails to work correctly. If you can cause the spontaneous reboot even 
with a debug build of Xen, it probably means a bogus value in %cr3 
(garbage got written there, or the pagetables got corrupted or freed 
before a CPU had finished using them).
I guess the lazy context switching could be going wrong -- might be 
worth calling __context_switch() unconditionally from context_switch() 
in arch/x86/domain.c (i.e., just comment out the if statement).
 -- Keir


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