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

["Santos, Jose Renato G" <joserenato.santos@xxxxxx>]

>> -----Original Message-----
>> From: Keir Fraser [mailto:Keir.Fraser@xxxxxxxxxxxx] 
>> Sent: Friday, September 09, 2005 11:13 AM
>> To: Santos, Jose Renato G
>> Cc: Turner, Yoshio; xen-devel@xxxxxxxxxxxxxxxxxxx; G John Janakiraman
>> Subject: Re: [Xen-devel] NMI with SMP domain causing machine 
>> to reboot
>> 
>> 
>> 
>> 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.
  Thanks for your suggestions. I really appreciate your help
  I tried the suggestion for changing context_switch() to call
  __context_switch() uncondicionally , but that
  did not help. I still see the same behavior.
  I was using a debug version of Xen from August 16 when doing my
  experiments until Wednesday when I downloaded the latest source tar
  ball (from sep 7).
  In this new version I have not set the debug flag. I will try this
  on Monday just to confirm that the spontaneous reboot still happens
  in the new version with debug on.
  
  Thanks

  Renato

>>   -- Keir
>> 
>> 

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